Multi Tech Systems Network Card ISIHP 2S User Manual

MultiModemISI Hybrid Series

Models ISIHP- 2S/2U/4S/4U/4SD

User Guide

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Contents

Introduction

Welcome and Product Description....................................................4

Peripiheral Component Interconnect (PCI) .......................................8

Communication Protocols .................................................................9

Hardware Installation

Introduction ...........................................................................................12

Computer Requirements ........................................................................12

Shipping Contents .................................................................................12

Safety Warnings.....................................................................................12

Hardware Installation Procedure ...........................................................13

LED Indicators ......................................................................................16

Software Installation .................................................................... 19

Installing the ISIHP in Windows NT 3.51/4.0 ........................................... 20

Installing TAs and Modems to COM Ports in Windows NT ........... 24

I/O Addresses and IRQ Codes .................................................................... 32

Removing ISIHP Card & Driver in Windows NT 3.51/4.0 ........................ 33

Installing the ISIHP in Windows 95 and Windows 98................................ 34

Windows 95 Installation ............................................................................. 34

To Remove the ISIHP Card and Drivers in Windows 95 .......................... 36

Windows 98 Installation ............................................................................. 36

To Remove the ISIHP Card & Drivers in Windows 98 ............................. 39

To Remove the ISIHP Card ............................................................. 39

To Remove the Drivers .................................................................... 39

Installing TAs & Modems to COM Ports in Windows 95 /98 ........ 40

Removing the Driver (Windows 95 only) ........................................ 49

Configuring the Terminal Adapter: Introduction ........................................49

North American Users ...........................................................................50

International Users ........................................................................... 51

Optional Settings ...................................................................................51

ISDN TA Configuration Utility .............................................................52

ConfigMenu Configuration Utility ........................................................58

ConfigMenu menus ...............................................................................59

Terminal Adapter AT Commands ..........................................................60

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Introduction

NetWare Connect (Novell) Driver Installation (2S/2U only) .....................61

Configuring Ports for NetWare Connect .......................................... 61

Removing the Driver (Novell) ......................................................... 61

SCO Open Server 5 Driver Installation ......................................................62

MultiTech Installation Script ........................................................... 63

Activating Ports in SCO Open Server 5........................................... 65

Removing the Driver (SCO Open Server 5) .................................... 67

Linux Driver Installation ............................................................................68

Warranty & Service

AT Commands and S-Registers

...............................................................................................................73

Troubleshooting

.............................................................................................................142

Regulatory Info ........................................................................... 148

Index ............................................................................................ 154

Welcome to Multi-Tech’s new MultiModemISI Hybrid Series,

models ISIHP-2S/2U and ISIHP-4S/4U, multiport hybrid ISDN cards

that can be plugged into any PCI slot for applications that involve

ISDN or modem calls over ISDN BRI lines. When the ISIHP is used

with Remote Access Servers (RAS), remote users can call in using

either modems or ISDN terminal adapters (TAs). For V.90 modem

calls, a 56kbps download speed can be achieved without the expense

of T1, E1, or ISDN PRI lines. This manual also describes the ISIHP-

4SD, a serial interface card equipped with four terminal adapters only

(no analog modems are present). The ISIHP-4SD is otherwise like the

ISIHP-4S/4U models. S-models use the ISDN “S” interface; U-

models use the ISDN “U” interface.

The ISIHP-2S/2U contains two terminal adapters and four V.90/

K56flex modems. The ISIHP-2S/2U uses two ISDN BRI lines (each

offering two B-channels) to connect to the telco and these connect to

its two built-in terminal adapters. In addition to handling ISDN calls,

each terminal adapter can detect analog modem and fax calls. When

Induction

Welcome and Product Description

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Introduction

analog calls are detected, they are automatically connected to one of

the four V.90 modems on the ISIHP board. In this way, these hybrid

cards can handle either ISDN calls or analog modem calls. Although

the ISIHP-2S/2U contains four ISDN TA ports and four analog

modem ports, only four ports can be active at any one time (because

only four B-channels are present). See Figure 1-1.

The ISIHP-4S/4U works like the ISIHP-2S/2U but contains four

terminal adapters and eight V.90/K56flex modems. The 4S and 4U

models each accommodate four ISDN BRI lines. The configuration of

modem and TA ports for the 4S and 4U models is shown in Figure 1-

The ISIHP-4SD contains four terminal adapters only (the daughter

card containing the eight modems is absent). Since it accommodates

four ISDN BRI lines (each offering two B-channels), it supports eight

independent digital data connections.

Each terminal adapter appears as two ports to the server PC using the

ISIHP card.

ISIHP cards also support dial-out applications via their modems or

terminal adapters.

The ISIHP-2S/2U card offers eight RAS ports using two Basic Rate

Interface (BRI) ISDN lines; the ISIHP-4S/4U has 16 ports using four

BRI ISDN lines. For the ISIHP-2S/2U, its eight ports allow a server

to accept any combination of analog modem and digital ISDN calls,

making a maximum of four simultaneous independent data

connections. For the ISIHP-4S/4U, its sixteen ports allow a server to

accept any combination of analog modem and digital ISDN calls,

making a maximum of eight simultaneous independent data

connections. This arrangement gives the user the flexibility to

customize the settings of the terminal adapters and modems. The

terminal adapters on the ISIHP-4SD can make eight simultaneous

independent connections.

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Introduction

Com Ports

ISDN

Modem

RJ-45 jack

Line 1

Modem

RJ-45 jack

Line 2

Modem

Figure 1-1: Modems and Terminal Adapters of ISIHP-2S/2U

Modem

RJ-45 Jack

Modem

RJ-45 Jack

Modem

RJ-45 Jack

Modem

RJ-45 Jack

Modem

Figure 1-2: Modems and Terminal Adapters of ISIHP-4S/4U (for ISIHP-4SD, no

modems are present)

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Introduction

From the perspective of the server PC, the ISIHP-2S/2U is an eight-

port serial card with eight devices permanently attached to the serial

ports (Figure 1-1). The first four ports are the two terminal adapters,

each of which appear as two ports. The remaining four ports are the

four central site modems. The following chart summarizes the

correlation of ports and devices.

2S/2U Port #

Device

ISDN Line Number

Modem

From the perspective of the server PC, the ISIHP-4S/4U is an sixteen-

port serial card with sixteen devices permanently attached to the serial

ports (Figure 1-2). The first eight ports are the four terminal adapters,

each of which appear as two ports. The remaining eight ports are the

eight central site modems. The following chart summarizes the

correlation of ports and devices. The ISIHP-4SD contains terminal

adapters only; no modems are present.

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Introduction

4S/4U Port #

Device

ISDN Line Number

Modem

This ISIHP Quick Start Guide contains installation instructions and

technical support information. Because it’s written for audiences with

basic PC skills, step-by-step instructions for such basic operations as

logging in and file editing are not included.

Peripiheral Component Interconnect (PCI)

First developed by companies such as Intel^TM, AT&T^TMand Digital

Equipment Corporation^TM, the Peripheral Component Interconnect

(PCI) bus used by your ISIHP card provides high performance and is

easy to use. Because PCI devices contain registers with the device

information required for configuration, full auto configuration of PCI

Local Bus add-in boards and components is supported. Performance

factors include a bus data path of 64 bits, clock speeds of 66 MHz,

and bandwidth of 264 Mbs.

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Introduction

Communication Protocols for ISIHP Ports

Ports on the ISIHP card can be associated with different protocols, as

follows:

Auto-Protocol. Modem or terminal adapter automatically negotiates

with host to operate using the host’s current protocol.

Central Site Modem. Common designation for analog modems built

into the ISIHP card. These are V.90 modems. For the ISIHP-2S/2U,

the last four modems should be designated as Central-Site modems;

for the ISIHP-4S/4U, the last eight modems should be designated as

Central-Site modems. (See Port/Device table on previous page.)

MultiLink PPP async. This protocol allows the functional bundling

together of three WAN ports so they function as a single high-

bandwidth data pipeline using only one IP address. Bundling occurs

on demand when the needed bandwidth exceeds that available on a

single circuit.

PPP async. (Point-to Point Protocol, asynchronous) Protocol

allowing computers a dial-up connection to the Internet. PPP includes

error detection, data compression and other improvements over Serial

Line Internet Protocol (SLIP) connections.

V.120. Terminal rate adaptation protocols. These apply to ISDN B-

channels when using a V interface. This protocol includes V.110.

X.75. An international standard that allows X.25 packet-switched

networks to communicate with each other. X.75 is a gateway protocol

for interconnection of X.25 public networks.

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Introduction

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Hardware Installation

Hardware

Installation

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Hardware Installation

Introduction

This section describes how to install the ISIHP server card into the

PCI bus on your personal computer, which involves

• Opening your PC

• Installing the card into the PC

Computer Requirements

• Pentium-based PC or compatible with PCI bus architecture

• Microsoft Windows 95, Windows 98, Windows NT version 4.0, SCO

Open Server version 5.0, Novell NetWare, or Linux

• At least one floppy drive

• 800 blocks of hard disk space for UNIX, 100K bytes for Windows

NT, 34K bytes for Windows 95, 50K bytes for Novell

Shipping Contents

• ISIHP card

• RJ-45 ISDN cords (2 for ISIHP-2S/2U; 4 for ISIHP-4S/4U)

• ISIHP Driver Disk set

• ISDN TA Configuration Wizard disk

• Quick Start Guide

• User Guide (this online manual) on CD-ROM

Safety Warnings

• Never install telephone wiring during a lightning storm.

• Never install telephone jacks in wet locations unless the jacks are

specifically designed for wet locations.

• Never touch uninsulated telephone wires or terminals unless the

telephone line has been disconnected at the network interface.

• Use caution when installing or modifying telephone lines.

• Avoid using a telephone (other than cordless type) during an

electrical storm. There may be a remote risk of electrical shock from

lightning.

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Hardware Installation

• Do not use the telephone to report a gas leak in the vicinity of that

leak.

• Ports that are connected to other apparatus are defined as SELV.

To ensure conformity to EN 41003, ensure that these ports are

connected only to the same type on the other apparatus.

Hardware Installation Procedure

1. Before handling the ISIHP card, discharge any static in your body

by touching a piece of grounded metal such as the computer

chassis.

2. Carefully remove the ISIHP card from its antistatic bag, handling it

only by the mounting bracket and edges. Do not touch the gold-

plated connectors along the bottom edge. (You may want to save

packaging for possible future use.)

3. Visually inspect the ISIHP-2S/2U/4S/4U/4SD. The 2S and 4SD

models have only one daughter card, whereas the others have two.

If you have any concerns about the condition of your ISIHP unit,

call Technical Support at (612) 717-5863.

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Hardware Installation

Intelligent Serial Interface

Hybrid (ISDN/POTS) Cards

(Side View)

V.110

Daughter Card

ISIHP-2S

International

V.110

Daughter Card

Modem Card

ISIHP-2U

U.S. Domestic

V.110

Daughter Card

Modem Card

ISIHP-4S/4U

Figure 1-3: ISIHP Cards; Side View (on ISIHP-4SD, right daughter card is not present)

4. To avoid damaging the ISIHP-2S/2U and your PC, make sure your

computer and any peripheral equipment connected to it are turned

off. The ISIHP-2S/2U can be installed in a Pentium equivalent

PCI bus computer.

5. Remove the cover of your computer as instructed in your

computer’s documentation.

6. Locate the unused PCI slot you will be using for your ISIHP-2S/2U

card and remove the slot cover according to instructions in your

computer’s documentation.

7. Install the ISIHP-2S/2U card in the selected expansion slot in the

same manner as any other add-on card according to your

computer’s documentation.

8. Fasten retaining bracket to computer chassis and replace the cover.

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Hardware Installation

9. Connect the ISIHP-2S/2U to your ISDN telephone wall jack with

the provided modular telephone cable.

S/T Interface

S Interface

U Interface

ISIHP

-2S

NT1

Device

ISDN line enters

building

Figure 1-4: ISDN Interfaces at Customer Premises

Note: The ISIHP communicates over ISDN lines. If you don’t have

a standard modular jack near your computer, you should install

one or have one installed by your telephone company. In the US,

installation kits and adapters are available wherever telephones

are sold.

Note: If S/T-interface ISDN network connection cable is used, the

ISDN phone cord should be connected between the ISDN network

connection cable and the NT1 device. If the S/T-interface model

(ISIHP-2S, -4S, or 4SD) is used, then the S/T-interface must be

connected to the S-interface on the NT1 device.

10. Turn on power to the computer. Now you are ready to install

software.

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Hardware Installation

LED Indicators

The mounting brackets for the four ISIHP cards are similar, but the LEDs

are labeled differently. Below, and on the next page, are graphics for each

bracket along with descriptions of the LED indicators.

ISIHP-4U LEDs (one LED per BRI)

•

Flashes between OFF and RED to

indicate that neither SPID for that ISDN

line has been verified.

•

Flashes between RED and GREEN to

indicate that one SPID is correct.

LINE 1

Line 1

Line 2

A solid GREEN display indicates that

both SPIDs are correct.

ISIHP-4S/4SD LEDs (one LED per

BRI)

Line 3

Line 4

•

Solid GREEN indicates normal

operation.

•

Flashes between RED and GREEN to

indicate that the device has been reset.

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Hardware Installation

ISIHP-2S LED Indicators

B1 LED Indicator

• When lit, indicates active or voice connection on

B-channel 1.

• When lit, indicates active or voice connection on

B-channel 2.

B1 B2

LINE 1

B1 B2

LINE 2

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Hardware Installation

ISIHP-2U LED Indicators

P LED Indicator

• Indicates U interface status connection.

• Controlled by NT-1, which converts S/T

interface (4-wire ISDN) to U interface

(2-wire ISDN).

• When U interface and S/T interface are NOT

active, LED remains off.

D P

• Flashes 8 times/second (8 Hz)—U interface

is attempting to activate.

LINE 1

• Flashes once/second (1 Hz)—U interface is

active; S/T interface is not fully active.

• Lit, not flashing—Both U and S/T interfaces

are active.

D P

D LED Indicator

LINE 2

• Lights when the ISIHP-2S/2U is turned on.

• Flashes until SPIDs are verified with the

central office switch; then remains lit without

flashing.

• Indicates data link layer status.

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Software/Driver Installation

Software

Installation

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Software/Driver Installation (Windows NT)

Installing the ISIHP in Windows NT 3.51/4.0

The following procedure describes how to install the ISIHP card in a

system operating Microsoft Windows NT 3.51 or 4.0 for use with

Remote Access Service (RAS) server and other communications/fax

server type applications. These procedures refer to both 3.51 and 4.0.

1. Install the ISIHP in an available PCI slot as described in the

installation section of this manual.

2. Turn on the computer.

3. Click Start, Settings, Control Panel, and then double-click

Network. In the Network dialog box, click the Adapters tab. Then

click Add.

4. The Select Network Adapter dialog box appears. Click Have

Disk.

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Software/Driver Installation (Windows NT)

5. The Insert Disk dialog box appears. Insert the MultiModem ISI

Driver for Windows NT diskette and click OK.

6. The Select OEM Option dialog box appears. Click OK.

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Software/Driver Installation (Windows NT)

A transient dialog box will appear while the setup program is

loaded from the diskette to the PC hard drive.

7. The ISI Cards dialog box appears. Click Add.

8. Then this ISI Cards dialog box appears. Select the starting port

(usually port 3).

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Software/Driver Installation (Windows NT)

9. The ISI Cards dialog box appears again showing the port

assignment. Click Add to add additional cards and repeat step 8.

After the last ISIHP card has been added, click Close.

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Software/Driver Installation (Windows NT)

10. The file copies and Multi-Tech ISIHPAdapter appears in the

Network Adapters box. Click Close.

11. When this dialog box appears, click Yes to reboot your system.

The ISIHP-2S/2U now is installed in Windows NT.

Installing TAs & Modems to COM Ports in Windows NT

To install terminal adapters:

1. In the Control Panel, double-click the Modems icon.

2. The Modem Properties dialog box appears. Click Add.

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Software/Driver Installation (Windows NT)

3. The Install New Modem dialog box appears. Check the box

marked Don't detect my modem; I will select it from a list and

click Next.

4. The Install New Modem dialog box appears. Click Have Disk.

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Software/Driver Installation (Windows NT)

5. The Install From Disk dialog box appears. Click OK (diskette

should still be in drive).

6. The Install New Modem dialog box appears. From the Models

list, select an ISDN protocol (Auto-Protocol, ML-PPP, PPP, V.120,

or X.75, depending on your application). ( See description of

protocols in the Introduction chapter of this manual.) Then click

Next.

7. The Install New Modem dialog box appears. Select the ports that

correspond to the first four ports of the ISIHP-2S/2U card, OR the

first eight ports of the ISIHP-4S/4U . Any ports that existed prior

to installing the ISIHP appear first in the list of available COM

ports. Click Next. The terminal adapters (screen displays modems)

install to the selected COM ports.

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Software/Driver Installation (Windows NT)

8. After the terminal adapters install, click Finish to return to the

General tab to view COM port assignments (and make changes if

necessary). Now you are ready to install the modems.

To install modems:

{does not apply to -4SD}

1. In the General tab, click Add.

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Software/Driver Installation (Windows NT)

2. The Install New Modem dialog box appears. Check the box

marked Don't detect my modem; I will select it from a list. Then

click Next.

3. The Install New Modem dialog box appears. From the Models

list, select Central Site Modems for the modems. Then click Next.

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Software/Driver Installation (Windows NT)

4. Select the ports that correspond to the last four ports of the ISIHP-

2S/2U card OR the last eight ports of the ISIHP-4S/4U card. Click

Next. The modems install to the selected COM ports.

5. After the modems install to the ports, click Finish to return to the

General tab.

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Software/Driver Installation (Windows NT)

6. To view COM port assignments and make necessary changes, use

the Modem Properties dialog box.

7. Close the Modems Properties dialog box. The message below

appears asking if you want to configure dial-up networking. Click

Yes.

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Software/Driver Installation (Windows NT)

8. The Remote Access Setup dialog box appears. Click Add.

9. Each COM port appears in a separate Add RAS Device dialog box.

To add the highlighted device, click OK.

10. The Remote Access Setup dialog box displays again. Repeat steps

7 and 8 until all devices are added.

11. When all devices have been added, click Continue.

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Software/Driver Installation (Windows NT)

12. After the bindings have been reviewed and stored, the message

below appears, click Yes.

After re-booting, the ISI Cards icon appears in the Control Panel.

icon

You are now ready to configure the terminal adapter. See the

section,“Configuring the Terminal Adapter,” on page 49.

I/O Addresses and IRQ Codes

Unlike many modem products, the ISIHP has no DIP switch for I/O

addresses and no jumper to determine the IRQ code. The input/output

address and the interrupt request code (IRQ) for the ISIHP are

assigned automatically during driver installation. During any

subsequent re-cofiguring of your PC, you may need to know the

assigned I/O address and IRQ code. To determine the I/O address

and IRQ assigned to the ISIHP:

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Software/Driver Installation (Windows NT)

(for Windows NT) click on Start, Settings, Control Panel and select

the ISI Cards icon; or click on Start, Programs, Administrative

Tools (Common), Windows NT Diagnostics, Resources;

(for Windows 95) click on Start, Settings, and Control Panel. From

the Control Panel, click on System icon and then the Device

Manager tab. From there, click on the Computer icon at the top

of the Device Manager window. The Computer Properties

dialog box will appear. In the View Resources tab, click on either

the Interrupt Request (IRQ) or Input/Output (I/O) radio buttons

to view lists of both the IRQs and I/O memory addresses in use in

the computer and what devices are currently using these resources.

Removing ISIHP Card and Driver in Windows

NT 3.51/4.0

1. Click Start, Settings, Control Panel, and then double-click

Network.

2. The Network dialog box appears. Click the Adapters tab.

3. Select Multi-Tech PCI ISI Card, and then click Remove.

Note: To complete an uninstall, reboot your system.

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Software/Driver Installation (Windows 95/98)

Installing the ISIHP in Windows 95 and Windows 98

This section describes how to install the ISIHP in systems operating

Microsoft Windows 95 or Windows 98 to use with a Remote Access

Service (RAS) server and other communications/fax server type

applications.

Windows 95 Installation

1. After installing the ISIHP in an available PCI slot, turn on the

computer.

2. Windows 95 automatically detects the ISIHP card. A dialog box

appears saying that Windows has found the new hardware and is

locating the software for it.

3. The Update Device Driver dialog box appears. Insert the ISIHP

Windows 95 driver diskette and click Next.

4. Windows 95 automatically searches for the unknown device and

locates the MultiTech ISI Port. After the operating system goes

through this process for every port added, click Finish.

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Software/Driver Installation (Windows 95)

5. To view the COM ports, click Control Panel and double-click

System. In the System Properties dialog box in Device Manager,

the MultiTech PCI ISI Card appears under Multi Port. To view

ports, click Ports (COM & LPT). Click OK to close.

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Software/Driver Installation (Windows 95)

To Remove the ISIHP Card &Drivers in Windows 95

To remove the ISIHP card:

1. Click Start, Settings, Control Panel, and then System.

2. The System Properties dialog box appears. Click the Device

Manager tab.

3. Click Multi Port Adapter and select MultiTech PCI ISI Card,

and then click Remove.

To remove the drivers:

1. Click Start, Settings, Control Panel, and then double-click Add/

Remove Programs.

2. Select MultiTech ISI Card and then click Add/Remove.

Note: To complete an uninstall, reboot your system.

Windows 98 Installation

1. After installing the ISIHP card in an available PCI slot, turn on the

computer.

2. Windows 98 automatically detects the ISIHP card. A dialog box

appears saying that Windows has found the new hardware and is

locating the software for it.

3. The Add New Hardware Wizard dialog box appears.

Click Next.

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4. In the next Wizard dialog box, select Search for the best driver

for your device. (Recommended). Then click Next.

5. In the next Wizard dialog box, make sure Floppy disk drives is

checked. Insert the MultiModem ISI Driver for Windows 95/98

diskette. Then click Next and the system locates the file.

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6. When this Wizard dialog box appears, click Next.

7. Windows then installs the device driver for the ISIHP card. When

this dialog box appears, click Finish.

Windows 98 will now detect and create COM ports (for ISIHP-

2S/2U/4SD, 8 ports are made; for ISIHP-4S/4U 16 ports are

made).

8. After the COM parts have been created, you must re-boot your PC

(remove the diskette from the floppy drive before re-booting).

9. To view the COM ports, click Control Panel and double-click

System. The System Properties dialog box appears.

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The MultiTech PCI ISI Card is located under Multi Port Adapter.

Click Ports (COM & LPT) to view the ports. Click OK to close.

To Remove the ISIHP Card and Drivers in

Windows 98

To remove the ISIHP card:

1. Re-boot your computer.

2. Click Start, Settings, Control Panel, and then System.

3. The System Properties dialog box appears . Click the Device

Manager tab.

4. Click Multi Port Adapter and select MultiTech ISIHP-2S/2U

2BRI/4 56K Hybrid Card. Then click Remove.

To remove the drivers:

1. Click Start, Settings, Control Panel, and then double-click Add/

Remove Programs.

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2. Select MultiTech ISI Card and then click Add/Remove.

Installing TAs & Modems to COM Ports in Windows

95 /98

To install terminal adapters:

1. Click Start, Settings, Control Panel, and then double-click the

Modems icon.

2. If no modems are currently installed, the Install New Modem

dialog box appears. Check the box marked Don't detect my

modem; I will select it from a list. Then click Next.

If other modems have been installed, the Modems Properties

dialog box will appear.

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Click Add and the Install New Modem dialog box will appear.

Check the box marked Don't detect my modem; I will select it

from a list. Then click Next.

3. The Install New Modem dialog box appears. Insert diskette

labeled MultiModem ISI Driver for Windows 95 & Netware AIO

and click Have Disk.

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4. The Install From Disk dialog box appears. Click OK.

5. The Install New Modem dialog box appears. Select a protocol

(depending on your application) from the Models list; then click

Next.

6. The Install New Modem dialog box appears. Select the port that

corresponds to the lowest numbered port of the ISIHP card. Any

ports that had been installed before installing the ISIHP card are

numbered lower than the ports of the ISIHP card. Click Next.

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7. Windows will install the first terminal adapter. Click Next.

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8. After the terminal adapter installs, click Finish to return to the

General tab to view COM port assignments (and make changes if

necessary).

9. Click Add and repeat installation steps 2–8 to install terminal

adapters to the first four ports of the ISIHP-2S/2U (OR the first

eight ports of the ISIHP-4S/4U/4SD). After the terminal

adaptershave been installed, you are ready to install the modems.

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To install modems (Windows 95/98): {not applicable to -4SD}

1. In the General tab, click Add.

2. The Install New Modem dialog box appears. Check the box

marked Don't detect my modem; I will select it from a list. Then

click Next.

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3. The Install New Modem dialog box appears. Insert the driver

diskette labeled MultiModem ISI Driver for Windows NT. Then

click Have Disk.

4. The Install from Disk dialog box appears. Click OK.

5. The Install New Modem dialog box appears. From the Models

list, select Central Site Modems for the modems. Then click Next.

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6. The Install New Modem dialog box appears. Select the

numbered port corresponding to the first modem of the ISIHP

card. Click Next. The modem installs to the COM port.

7. After the modem installs to the port, click Finish.

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8. Return to the General tab to view COM port assignments (and

make changes if necessary).

9. Click Add and repeat installation steps 2–8 to install modems to the

last three ports of the ISIHP-2S/2U (OR the last seven ports of the

ISIHP-4S/4U).

Now you are ready to configure the terminal adapters.

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Removing the Driver (Windows 95 only)

1. Click Settings, Control Panel, and then double-click Add/

Remove Programs.

2. From the list box, select ISICOM Driver.

3. Click Add/Remove and follow screen instructions.

Configuring the Terminal Adapter

Introduction

North American users must configure the terminal adapter to match

network switch type, the service profile identifier (SPID), and the

directory number (DN). For international users, the terminal adapter

ships already configured for NET3, which should work on most phone

lines in Europe. However, you may want to customize settings,

regardless of your location. (See “Optional Settings” on the following

page.)

You can configure the terminal adapters with the ISDN TA

Configuration utility, ConfigMenu, or with AT commands.

Instructions for all three are provided in this section.

• ISDN TA Configuration Utility—recommended for computers with

Windows 95/98 and Windows NT.

• ConfigMenu—recommended for computers with DOS or Windows

3.x and a VT100/ANSI compatible terminal or data communication

program that includes VT100/ANSI terminal emulation.

• AT Commands—allow you to fine tune TA operation with AT

commands and S-registers. Enter these commands in your data

communication program’s terminal mode. AT commands are

described in detail in the online manual.

North American Users

Before you connect the ISIHP-2S/2U to your network terminator, you

must configure it to match the following:

• Network Switch Type____________________

Select the network switch type your ISDN service uses at its local

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central office. You can set the TA to NET3, AT&T 5ESS, NT DMS-

100, or US National ISDN-1. If you don't know the switch type, get

the information from the local phone company. AT command: !CO=

• SPIDs and DNs ________________________

The TA must be configured with the Service Profile Identifier

(SPID). The SPID, assigned by the local phone company, is for the

specific BRI line where TA is attached. The SPID field is empty prior

to configuration. AT command: AT!C6= and AT*!C6

The Directory Number (DN) is the phone number another user would

call to contact this TA once it is attached to the ISDN. AT commands:

AT!N1= and AT*!N1=

Note: SPIDs only apply for North American switch types.

International Users

The terminal adapters ship already configured for NET3, which should

work for most telephone lines in Europe. If you want to customize

settings, refer to the “Optional Settings” below.

Optional Settings

• Data TEI _____________________________

The Data TEI is the TEI (terminal endpoint identifier) assigned to the

data channel. You can select Auto TEI, a fixed TEI, or Disable. A

TEI is a number used by the central office switch to uniquely identify

each device that is connected to the network. When it uses dynamic

TEI assignments (Auto TEI), the central office switch assigns a TEI

each time the TA connects to the network. However, the ISDN

service provider may assign a fixed TEI at subscription time, in

which case you must configure the TA with the fixed TEI number.

You also can disable the channel, which may be useful when multiple

TAs are attached to a network terminator bus. AT command: !D3=

• Voice TEI _____________________________

The Voice TEI is the TEI assigned to the voice channel. You have the

same choices as for Data TEI: Auto TEI, fixed TEI number, or

Disable.

AT command: *!D3=

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• Persistent DTR Dialing __________________

A high DTR (Data Terminal Ready) signal on the serial port indicates

that your computer or terminal is ready to communicate with your

TA. DTR normally goes high when a communication program starts

or is ready to dial. Persistent DTR dialing enables the TA to

automatically redial the number stored in memory location 0

whenever DTR is high, and the serial port does not have an active

call. You can enable or disable this feature. AT command: $D

• Auto Answer Data Calls _________ Rings to Answer_________

Select Auto Answer if you want the TA to automatically answer all

incoming data calls (option does not affect analog port). The Rings to

Answer number (range: 1—255) selects number of rings the TA waits

before answering an incoming call. Default: 1 ring. AT command:

S0=

• Dialing Method ________________________

Select either the Enbloc or the Overlap dialing method for use when

establishing a data call. Your ISDN provider determines the dialing

method. The enbloc method is used for most ISDN dialing; however,

you can select the overlap method if you are working with a private

network. AT command: %A97=

• Data Protocol _________________________

The data protocol, also known as the B-channel protocol and the rate

adaptation protocol, is the language spoken over each 64 Kbps

channel between two ISDN devices. The devices on both ends of the

ISDN link must use identical protocols. AT command: !Z

V.120 Protocol—provides rates up to 64000 bps on each B channel.

PPP Protocol—provides rates up to 64 Kbps per channel.

V.110 Protocol— a rate adaptation protocol that adapts the rates of

slower asynchronous terminals to the data rate of the ISDN B-

channels. 9600 bps V.110 connections are supported by the ISIHP

products for compatibility with digital calls originating from GSM

networks.

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X.75 Protocol— The ISIHP uses layer 2 of the X.75 protocol as an

error correction protocol on the B-channel.

• Stored Numbers ________________________

The TA can optionally store as many as 10 phone numbers, up to 20

characters each. AT command: &Z=

• Dialing Stored Numbers _________________

The TA can dial a number previously stored in directory number n

using the &Zn=x command. AT command: e.g., DS3

ISDN TA Configuration Utility

1. Make sure Windows NT Remote Access Service (RAS), or any

other application that is using the modem, is shut down. To shut

down RAS, click Start, Programs, and then Administrative Tools

(Common). Then click Remote Access Admin and click Server,

which will indicate whether or not RAS is running. If it is running,

click Stop Remote Access Service.

2. Insert the Config Utility diskette into the floppy drive.

3. From the main desktop of your PC, select Start, Settings, Control

Panel. Click on the Add/Remove Programs icon. Click Install.

4. The dialog box Install Program from Floppy Disk or CD-ROM

appears. Click Next. The Run Installation Program dialog box

appears. Click Finish.

5. The Welcome dialog box for the ISDN TA Configuration Utility

Setup program appears. Click Next.

6. The Choose Destination Location dialog box appears.

7. The Setup dialog box appears.

8. The Information dialog box appears. Click OK.

9. Click Start, Programs, and then the ISDN TA Configuration

Utility icon.

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10. The Welcome dialog box appears. Click Next.

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11. The Searching for TA dialog box appears. Click Next.

The next dialog box specifies the TA that has been identified.

12. The Configuration dialog box appears. If you have questions

about choices, click Help. After entering information in each

dialog box, click Next.

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13.The SPID dialog box appears (North America only). Referring to

your network configuration notes, enter the appropriate informa-

tion; then click Next.

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14. The Data Protocol Setup dialog box appears. Referring to your

network configuration notes, enter the appropriate information;

then click Next.

15. In the Save Configuration dialog box, enter a name to store the

configuration. Then click Next.

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16. To load the configuration, click Next in the Load Configuration

dialog box.

17. Then click Finish in the Configured dialog box.

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18. The first TA now is configured. Click Back to return to the

Configuration dialog box and repeat steps 4 through 9 to

configure the remaining TA(s). If you install multiple ISIHP cards

in the same PC, you must configure two TAs per 2S or 2U card

installed or four TAs per 4S or 4U card. For example, if you install

four ISIHP-2S/2U cards in one PC, you have to configure eight

TAs (two per card).

29. After all TAs are configured, close the ISDN TA Configuration

utility.

ConfigMenu Configuration Utility

The ConfigMenu configuration utility can be used as another means of

configuring the TA. ConfigMenu is installed in the TAs as part of the

firmware.

To use ConfigMenu:

1. Start a data communication program and select the COM port

where the TA is connected.

2. In the communication program dialog box, type AT@CONFIG

and press ENTER. ConfigMenu’s Main Menu appears (see screen

below).

3. To select menu item, type its number and press ENTER. A

submenu then appears where you can make selections. At the

lowest level, you can change a configuration option by selecting a

number or typing a value and pressing ENTER.

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4. When you finish, close ConfigMenu by typing x and pressing

Enter.

5. You will be prompted to decide whether to save the configuration

when you exit the ConfigMenu program. Type y to have

ConfigMenu automatically save the configuration.

ConfigMenu Menus

Network Configuration Menu—configures network parameters such

as switch type, data and voice TEIs, and data and voice MSNs. When

you finish, select Save Network Configuration to save your work.

Call Control Configuration Menu—changes how the TA originates

and answers calls. Options include Auto Answer, Rings to Answer,

Dialing Method, and Persistent DTR Dialing.

Data Protocol Menu—changes rate adaption protocol used by the TA.

Stored Numbers Menu—stores up to ten phone numbers ( maximum

of 20 characters each). Stored number 0 is the phone number that will

be dialed if persistent DTR dialing is enabled.

Port Control Configuration Menu—configures TA’s serial port,

including how TA responds to control signals on the serial interface.

Help Menu—provides assistance in navigating through the TA menu

system or viewing the ISIHP’s firmware version numbers.

Terminal Adapter AT Commands

You can configure the terminal adapters using AT commands, just as

you would configure an analog modem. Use this method if you prefer

to work with AT commands or if you have a special requirement not

addressed by either of the configuration utilities.

To configure the TAs with AT commands:

1. Start a data communication program and select the first and third

COM ports to be configured.

2. Referring to records made for your system, enter AT commands in

the terminal window of the data communications program.

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3. When you finish, use the &W command to save your new

configuration and to select it to load automatically when the ISIHP

is turned on.

4. Close the data communications program.

For more information, see the chapter on AT Commands and S-

Registers in this manual.

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NetWare Connect (Novell) Driver Installation

{2S/2U models only}

Multi-Tech Systems provides AIO drivers for the ISIHP-2S/2U, so it

can function with Novell compatible asynchronous applications (e.g.,

NetWare Connect). The AIO driver is simply an NLM (NetWare

Loadable Module) that runs on the file server. Drivers must be loaded

on the file server where the board is installed. Drivers can be loaded

from the file server’s console prompt or incorporated for autoloading

in the AUTOEXEC.NCF file.

To install the Multi-Tech AIO driver, copy the file AIOISIX.NLM to

the system directory of the file server from a workstation on the

network. To copy, you can use the following command:

COPY A:\NOVELL\AIOISIX.NLM F:\SYSTEM

To load the driver, go to the system or PC console (where the ISIHP-

2S/2U is installed) and enter the following at the prompt:

LOAD AIOISIX [port=W] [int=X] [name=Y] [note=Z]

To install the ISIHP scripts, copy aiomdms.mdc to

f:\system\aio\directory. Click Yes to overwrite the existing

aiomdms.mdc file.

Configuring Ports for NetWare Connect

To set up NetWare Connect ports, enter LOAD NWCCON at the

NetWare console prompt. LOAD NWCCON opens the NetWare

Connect Configuration Utility. Select the appropriate menu options

(modem type, speed, flow control, etc.)

Removing the Driver (Novell)

In Novell, remove file AIOISIX.NLM from the system directory and

make the appropriate changes to the Autoexec.ncf file.

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SCO Open Server 5 Driver Installation

The installation utility provided by SCO is called custom. This section

describes opening the utility and installing the driver. The instructions

below should be used only on SCO Open Server 5 systems. When you

have completed the steps below, go to Multi-Tech Installation Script,

which immediately follows this section.

1. Insert the driver diskette into a floppy drive. If installing the driver

from your default floppy drive, type custom and press ENTER

to open the custom utility. If using a nondefault drive, you must

inform your system of the disk drive from where you are doing the

installation and specify the size and capacity of the diskette(s).

2. Select Software and press ENTER.

3. The main menu displays a list of options. Press ENTER to select

the highlighted item (default): Install.

4. Select From comscoand press ENTER. (Comsco is a sample

server name.)

5. Make sure the driver diskette is in the floppy diskette drive and

then press ENTER to select the highlighted item (default):

Floppy Disk Drive 0. The following message appears:

Examining media. Please wait ꢀ

6. The system recognizes that you are installing the Multi-Tech Serial

Card Driver and prompts you to select the type of installation.

7. (A) In version 5.0.2, select Full Installation and press

ENTER to continue. The following messages appear:

Extracting Files...

Executing Multi-Tech Serial Card

Driver Init Script...

(B) In versions 5.0.4 and 5.0.5, press ENTER twice, or tab down to

‘install’ and press ENTER.

8. When installation finishes, this prompt appears:

Do you wish to continue ( y / n / q ):?

Type Y and press ENTER. A message appears and you can begin

configuring your system with the MultiTech Installation Script.

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MultiTech Installation Script

The Multi-Tech Installation Script for SCO Open Server 5 systems

requests information about how many boards you want to install,

designations for communication ports and printer ports, and how many

pseudo devices you want to create for Multi_View utility. Based on

this information, the appropriate driver files will be installed and

linked with your system’s kernel.

1. This text appears on the screen:

You can install up to 4 ISA/PCI cards in a

system. The PCI cards will be autodetected on

bootup. Enter the number of ISA cards you

want to install and configure on your system

(0-4):

Select 0,which indicates that your computer has a PCI bus and

can autodetect the ISI cards.

2. The following text appears on the screen:

Multi_View is a utility which will allow you

to have multiple sessions on terminals that

have multiple pages of physical memory. In

order for this utility to work with

MultiTech’s serial cards, pseudo devices have

to be created in your /dev directory. These

devices are system-wide resources.

Enter the number of pseudo-devices to be

created for the use of Multi_View utility

(1 - 256).

The Multi_View utility initializes the multiple-page capability of

terminals with multiple pages of memory. The number specified

here is the total number of devices (between 1 and 256) available to

all Multi-Tech terminals and it’s the number of pseudo devices

available to the Multi_View utility.

Specify 8pseudo devices for each ISIHP-2S or -2U card installed;

specify 16for each ISIHP-4S or -4U card installed.

For example, if the computer contains three ISIHP-4S cards, you

would enter 48.

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3. This text appears on the screen and relates to the “/dev” directory.

This script also creates the devices in your

system to communicate with the ports of

ISICOM. The default prefix for the tty ports

is ttyl. The default prefix for the printer

is prnl. Is this acceptable? (y/n/q).

For most users, it’s best to select y, which entails accepting the

default values. Then proceed to step 4.

Details for use of non-default port/printer values. The /dev

directory holds device-information files used by the kernel to

access the hardware. When you add an ISI card, you must give the

ISI ports unique names so they do not conflict with existing ports or

with other devices known to your system. If a device name has

already been assigned to an existing device and the operator assigns

that name to a new device, then the existing device will be deleted

when the ISI port using its name is created.

a. To use a non-default base name, type Nand then enter a

basename having less than five characters. The base name you

select will be used for all ports on each card you install. ISI port

designations will have this form:

[basename prefix][board number][port letter].

basename: Length is one to four characters.

board number: Values will be 1, 2, 3, or 4, depending on

how many ISI cards are installed in your computer.

port letter: Use letters A through H.

In SCO UNIX, values A-H indicate modem ports.

Device basename selected: _________________

b. After you select a device basename, you are prompted for a printer

base name. This prefix identifies each port that supports a terminal

with a printer attached to its auxiliary port (for transparent

printing). Specify a unique printer base name (printer parameters

are outlined in the Multi_Setup Utility section in this manual ).

Printer base name selected: _________________

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When you have specified the device base name and the printer base

name, press Enter to continue.

4. The confirmation screen lists the values you have selected. The

following text appears on the screen (default values are shown):

You have chosen the following setup

The tty prefix is ttyl.

The printer prefix is prnl.

Number of Multi_View pseudo devices

[user-specified number].

If these values are correct, type Y and the installation process will

continue. If there is an error in any of the values displayed, type N

and the first screen displays. Then re-enter the information for each

card.

When you accept the confirmation list (by typing Y), a series of

messages displays while the driver is being installed and the kernel

rebuilt. After the terminals have been added to the Terminal

Control database, and when the display says “Press <Enter>

to continue:”, then press ENTER. When Installation

completedisplays, press ENTER again.

5. Select Hostand press ENTER . Remove the diskette from the

drive.

6. Select Exit and press ENTER .

7. To reboot the system (required), enter the following commands:

Type shutdown -g0-yand press ENTER

Type init 6and press ENTER .

Driver installation for the ISIHP card now is complete.

Activating Ports in SCO Open Server 5

SCO Open Server 5 provides a device database that monitors the

activity of serial ports through which users can log onto the host. If

your ISI ports are used by terminals (e.g., to allow users to log onto

your host), you must create an entry in the system’s device database

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that furnishes specific information for the terminals that will be used

on each ISI port. The database is referenced each time a user attempts

to log in. If there is no database entry for a particular terminal, access

to the host is denied.

1. Turn on your system and verify that the firmware for each ISIHP

loads successfully. If the firmware for a given ISIHP card does not

load, none of its ports will be accessible. (If this happens, see

Multi-Tech’s Administrative Utility section in this manual.)

2. Type the complete name of the first device you want to create in

usr/lib/uucp/Devices. Substitute the specific base name,

board number, and port letter for the generic parameters in the

expression ttylbx. Use a lower-case xvalue for local DTE

(terminal) support and an upper case Xvalue for modem control for

each port you want to enable. Example: ttyl2Adenotes the

second ISI card (2) and the first port on that card (A). The port

status can be altered later, but one setting must be selected at this

time. The ACU line would read as follows:

ACU ttylbX - 9600dialer name. Replace b, X and

dialer-namewith appropriate values.

3. Repeat this process for each port on each board you have installed.

Record the setting you select for each port.

4. Using device names created in the previous section, type the

following command for each port you want to activate: enable

ttylbx

5. Repeat this command for each port you want to activate, using the

lower case letter for local terminal use or upper case for modem

control.

Note: Only one of the options (e.g., modem control or local

terminal access) should be enabled for any port at one time. For

example, you cannot enable ttyl1a and then enable ttyl1A. To

change the status of a port, disable the current status (disable

ttyl1a) and then enable it for the desired status (enable ttyl1A).

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Software/Driver Installation

Removing the Driver (SCO Open Server 5)

To remove the Multi-Tech Serial Card Driver, enter the configuration

utility (e.g., custom for SCO Open Server 5) and follow instructions to

remove the entire driver and rebuild the kernel without the ISI driver.

If it is necessary to reinstall the driver due to I/O address or IRQ

overlap, remove the driver first.

Note: Remove the driver before permanently removing the ISI card from the

computer.

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Software/Driver Installation

Linux Driver Installation

To install the Linux driver:

1. Insert the driver installation diskette.

2. Prepare a temporary installation directory: mkdir isicom

3. Change your current directory to the temporary installation

directory:

cd \isicom

4. Place the file isicom.tar into the isicom directory.

5. Then extract the file using the tar utility: tar xvf /isicom/isicom.tar

6. Make sure the following are installed on your system: the make

utility, the GNU C compiler (gcc), and kernel sources.

7. Run the bash Install script to compile the driver as a loadable

module and to compile the user space firmware loader.

8. The files are copied to the destination folder. If you don’t specify

the folder, the destination folder default is /usr/local/ISICOM

(case sensitive). This also creates device files for the ISI cards,

normal and callout ports, in the /dev folder.

9. To load the driver manually, use the ISIHP installation

configuration stored in the ISICOMStart file in the destination

folder.

Or, you can include the configuration in the appropriate start-up

script stored in the /etc/rc.d/ folder, so it loads when you start the

computer.

10. If you make any changes to this configuration, edit the first line of

the ISICOMSTART file. The correct syntax for this line is as

follows:

insmod <destination folder>isicom.o

ISIBase1=0xXXXX

Irq1=XX

ISIBase2=0xXXXX

Irq2=XX Linux Driver Installation

ISIBasex and Irqx represent the base I/O address and IRQ that are

passed to the driver at module loading time. See the insmod

manual page for more details on parameter passing.

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Software/Driver Installation

Note: A base I/O address of 0, e.g., ISIBaseX=oxo, or omission of

these parameters for any card X, disables that particular card.

Miscellaneous:

Device files corresponding to ports on the ISIHP cards are created in the /

dev folder. Use ttyMxy for normal ports and cumxy for corresponding

callout ports. The letter x is the card number (1–4), and y is the port

number, (a–p) for 16-port cards.

Normal ports (ttyM) are configured for dial-in connections. Callout

ports (cum) are used for dial-out connections.

To view busy I/O address space on your system, enter:

cat /proc/ioports

To view busy IRQs, enter:

cat /proc/interrupts

To load the driver manually, use insmod.

Example: To load two ISI cards configured with base I/O addresses

0x210 and 0x200 and IRQs 5 and 10, enter the following in the

destination folder:

insmod isicom

ISIBase1=0x210

Irq1=5

ISIBase2=0x200

Irq2=10

To remove the driver manually, enter rmmod isicom. This removes the

driver only if no ISI ports are in use.

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Warranty and Service Information

Warranty & Service

Information

Upgrades and Support

You can access updated versions of firmware, drivers, flash utility

programs and other software-related support for ISIHP server cards

via the MultiTech web site and/or the MultiTech FTP site.

www.multitech.com (click Support; click Updates --Modem and ISI

Drivers; select operating system; then see Multiport Card PCI

Bus)

ftp://ftp.multitech.com (see Directory ISI Cards)

Service

Multi-Tech has an excellent technical support staff available to help

you get the most out of your Multi-Tech product. If you have any

questions about the operation of this product, call Technical Support

at (612) 717-5863. Model and serial numbers are located on the

Multi-Tech label on the component side of the ISIHP. To display the

firmware version, type ATI1 in terminal mode. Software versions are

printed on the diskette labels. Before calling Technical Support, note

the status of your equipment, including screen messages, diagnostic

test results, problems with a specific application, etc.

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Warranty and Service Information

Limited Warranty

Multi-Tech Systems, Inc. (MTS) warrants that its products will be free from

defects in material or workmanship for a period of two years from the date

of purchase, or if proof of purchase is not provided, two years from date of

shipment. MTS MAKES NO OTHER WARRANTY, EXPRESSED OR

IMPLIED, AND ALL IMPLIED WARRANTIES OF

MERCHANTABILITYAND FITNESS FOR A PARTICULAR PURPOSE

ARE HEREBY DISCLAIMED. This warranty does not apply to any

products which have been damaged by lightning storms, water, or power

surges or which have been neglected, altered, abused, used for a purpose

other than the one for which they were manufactured, repaired by the

customer or any party without MTS’s written authorization, or used in any

manner inconsistent with MTS’s instructions.

MTS’s entire obligation under this warranty shall be limited (at MTS’s

option) to repair or replacement of any products which prove to be

defective within the warranty period, or, at MTS’s option, issuance of a

refund of the purchase price. Defective products must be returned by

Customer to MTS’s factory transportation prepaid.

MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES

AND UNDER NO CIRCUMSTANCES WILL ITS LIABILITY EXCEED

THE PURCHASE PRICE FOR DEFECTIVE PRODUCTS.

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AT Commands and S-Registers

AT Commands

and

S-Registers

Contents

Modem AT Commands ............................................................................... 74

Modem S-Registers .................................................................................... 94

Modem Result Codes................................................................................ 101

Terminal Adapter AT Commands.............................................................. 104

Terminal Adapter S-Registers ................................................................... 126

Terminal Adapter Result Codes ............................................................... 135

Using AT Commands to Operate the Terminal Adapter........................... 136

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Modem AT Commands & S-Registers

Modem AT Commands

ISIHP modems are controlled by instructions called AT commands, so

called because the attention characters, AT, precede each command or

sequence of commands (known as a command string). You can send

commands to the modem from your keyboard while in terminal mode, or

you can use communications software to issue these commands

automatically.

The modem is in command mode when it is not dialing or online. When it is

in command mode, you have access to a complete communications system

that allows you to use several features, including the basic AT command set

described in this chapter. Using the basic AT command set, you can enter

phone numbers for automatic dialing, configure modem options, and

monitor telephone activity. In addition, you can command your modem to

perform advanced features such as error correction, data compression,

speed conversion, and more.

This chapter describes the modem’s operational modes and shows you how

to use each modem AT commands. These commands and responses are

compatible with all systems and with all data communications software

using the AT command set.

Modes of Operation

The modem operates in two basic functional modes: command mode and

online mode. (There is also an in-between state, wait-for-carrier, in which

the modem is out of command mode but not yet online.) When you turn on

the modem, it is in command mode and is ready to accept and respond to

commands from your keyboard or software.

The modem enters online mode after it dials, connects with another modem,

and detects a valid carrier signal. If it does not detect a carrier signal within

the time frame controlled by the S-register S7, the modem abandons the call

and reenters command mode.

You can make the modem enter online mode without dialing by entering AT

and then D (dial) or A (force answer mode). The modem exits online mode

if the carrier signal is lost or intentionally dropped. When this happens, the

modem hangs up and reenters command mode. By sending certain escape

characters to the modem while online, you can make it enter command

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Modem AT Commands & S-Registers

mode without losing the carrier signal. While waiting to establish the

carrier, you can type any character from the keyboard to make the modem to

go back to the command mode.

Command Structure

You can control a wide variety of modem operations and options when the

modem is in command mode. AT commands tell the modem to dial a

number, to answer a call, to operate at a certain speed, to use a certain

compression technique, and many other functions. AT commands consist of

one or two letters, which may be preceded by an ampersand (&), a percent

character (%), or a slash character (/). The Q command, for example,

determines whether the modem returns result codes, while the &Q

command selects the asynchronous communications mode.

A parameter after a command (0, 1, 2, etc.) tells the modem which option to

use. If you do not specify a parameter, the modem assumes the 0 (zero)

option. E, for example, is the same as E0. You can issue several commands

on a single line (a command string) as long as the line does not exceed 40

characters.

Note: Each character in a command counts toward the 40 character

command line maximum. Example: Q1 is a single command, but it counts

as two characters in the command line.

Each command has a valid range of parameters. For example, &S can have

only 0 or 1 as a parameter. Valid commands always generate an OK result

code, and a few generate an additional response such as a list of parameters.

An invalid command such as &S3, which has a parameter outside the valid

range, generates an ERROR result code. Most commands have a default

parameter that is enabled when the modem is turned on or reset with the

ATZ or AT&F command. Factory defaults are stored in read-only memory

(ROM) and cannot be changed. User-defined defaults can be stored in

nonvolatile random-access memory (NVRAM) and can be changed or

deleted at will.

Command Editing

Always begin a command with the letters AT. Enter the entire command

string in upper or lower case, but do not mix cases within the command

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string. The AT command is not executed until you press ENTER. Use the

BACKSPACE key to erase the previous command character. It will not

erase the AT characters once they are typed. If your keyboard has no

BACKSPACE key, use CTRL+H. (You can change the character recognized

by the modem as BACKSPACE to any other ASCII character by changing

Press CTRL+X to cancel an entire command that has been typed but not yet

executed. This also clears the command buffer. The effect is the same as

backspacing the command, only quicker.

The modem stores characters entered in a command in its command buffer

until they are executed by pressing ENTER. The command buffer’s capacity

is 40 characters. The attention characters (AT) do not count toward the 40-

character command line maximum. You may use spaces for increased

readability when typing a command. Spaces are not stored in the command

buffer, and they do not count towards the 40-character command line

maximum. Special characters, such as hyphens and parentheses, are not

allowed.

If you exceed the 40-character limit or type invalid characters, the

command buffer is automatically erased and an ERROR message appears.

Retype the command within the 40-character limit, using only the allowed

characters.

The commands in this chapter are organized by function. Abbreviated

commands are listed on the next page by function along with a short

description and page numbers that refer to a more detailed description,

immediately following this list.

Topic

Command Description

Dialing Action, p. 79

Dial

On-hook/off-hook

Dial Modifiers, p. 79

L, P, T, W Command accepted, but

has no function

Command accepted, but

has no function

;

Command accepted, but

has no function

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! $ @ ^

Phone Number Memory, p. 80 &Z

Command accepted, but

has no function

Store a phone number

Dial a stored number

Configuration Storage & Recall, p. 81

Store configuration

Load factory default

configuration

Reset modem

Select stored con-

figuration on power-up

Modem Responses (Result Codes), p. 82

E Echo command mode

characters

Result codes: enable/

disable

Result codes: verbose/

terse

Protocol result code

Result codes and call

progress

Select asynchronous

communications mode

Answer tone

Carrier control

Echo online data

characters

Online Connection, p. 84

-C

Guard tones

Data calling tone

Modulation handshake

Disable inactivity timer

Long space disconnect

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Modem AT Commands & S-Registers

RS-232 Interface Controls, p. 86 &C

Carrier Detect control

Data Terminal Ready

control

Data Set Ready control

Error Correction & Data

\N0 or &Q6 Non-error correction

mode

Compression, p. 89

\N3

Auto-reliable mode

\N2

Reliable mode

%C0

Data compression

disabled

%C1

Data compression

enabled

Repeat last command

Immediate Action, p. 89

Information request

V.32 auto retrain

View current

configuration

Flow Control, p. 90

&M0

Asynchronous mode

&K0 or \Q0 Flow control disabled

&K3 or \Q3 Hardware flow control

&K4 or \Q1 XON/XOFF flow control

\X0

XON/XOFF no pass-

through

Auxiliary relay control

Enable data buffer

control

Modem port flow control

Set break control

Escape Sequences, p. 92

+++AT<cr> Default in-band escape

sequence

Force answer mode

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Go back online

Dialing Commands

Use dialing commands to dial and hang up.

Dial

s = phone number

Default: none

Causes the modem to dial the telephone number immediately following it.

For example, if you type ATD5551212<cr>, the modem dials the number

555-1212.

On-Hook/Off-Hook

n = 0 or 1

Default: 0

Makes the modem hang up (go on-hook) or simulate the action of picking

up a telephone handset (go off-hook).

H0 (or H) hangs up the modem

H1 brings the line off-hook, just as if you had picked up

the telephone handset.

It is not necessary to use the H1 command to bring the line off-hook when

using the D command. The modem automatically goes off-hook when you

press ENTER at the end of the dial command.

Dial Modifier Commands

ISIHP-2S/2U/4S/4U modems rely on the terminal adapters on the card for

dialing. For backwards compatibility, the following dial modifier commands

can be included in the dial string. They are accepted by the modem, but

ignore the actual function. These commands are:

Redial Last Number

P, T

Pulse or Tone Dialing

Wait for New Dial Tone

Dialing Pause

;

Return to Command Mode After Dialing

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Modem AT Commands & S-Registers

Flash On-Hook

Detect Call Card Tone

Quiet Answer

Disable Data Calling Tone Transmission

Phone Number Memory Commands

ISIHP modems can store up to four telephone numbers in nonvolatile

memory. You can store the numbers with the &Z command and dial them

with the ATDS command.

&Zn=s

s = phone number

n= 0, 1, 2 or 3

Default: none

Store a Phone Number

You can store a telephone number string in the modem’s phone number

memory. You can store four of these strings using the &Zn=s command.

The memory locations are labeled N0 through N3. For example, the

telephone number 1-612-555-1212 is stored at memory location N2 by

typing &Z2=16125551212 and pressing ^ENTER.

DSn

n = 0, 1, 2, or 3

Default: none

Dial a Stored Number

You can automatically dial a telephone number that is stored in the modem’s

number memory by typing ATDSn, where n = 0 through 3. For example,

you can dial a number stored at N2 by typing ATDS2 in terminal mode and

pressing ^ENTER.

Configuration Storage and Recall Commands

The ISIHP-2S/2U stores parameters in two places. It stores factory default

parameters in read-only memory (ROM), and customized parameters in

nonvolatile random access memory (NVRAM). You cannot change the

default parameters in ROM, but you can change parameters in temporary

memory and then store them in NVRAM as custom settings. You can then

recall the custom settings as if they were factory default settings.

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&Wn Store Configuration

n = 0

Default: &W0

The &W command stores current AT commands and S-register values in

nonvolatile memory, so you won’t lose your custom settings when you turn

off the modem or reset it.

&W0 (or &W) stores all current AT command and S-register values in

nonvolatile random access memory (NVRAM) and configures the modem

so it reads your custom settings in NVRAM when the modem is turned on

or when it is reset with the Z command. The &F reset command continues

to read the factory default settings in ROM.

&Fn

Load Default Configuration

n = 0

Default: &F0

ISIHP-2S/2U modems store factory default AT command settings and S-

command and S-register values in nonvolatile random access memory

(NVRAM).

The &F0 (or &F) command resets modem to the factory default values

stored in ROM.

Reset Modem

n = 0 or 1

Default: none

The Z command resets the modem to the configuration last saved by the

&W command. The default values come from the customized configuration

in NVRAM.

Z1 is the same as Z0, and functions identically.

&Yn Select Stored Configuration for Hard Reset

n = 0

Default: 0

This command is included for compatibility with applications that issue the

&Y0 command. Modem functions are not changed.

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&Y0 selects the profile stored at location 0 on power-up.

Modem Response (Result Code) Commands

ISIHP modems can give responses to commands. The most common is OK,

but the modems also can alert you or your software to dial tones, busy

signals, connection speeds, and whether the connection is made with error

correction or compression enabled. These responses are called result codes;

they can be terse (numbers) or verbose (text).

Echo Command Mode Characters

n = 0 or 1

Default: E1

Normally, when you type commands on the keyboard, the modem echoes

the characters back to the computer or terminal, which displays them on the

monitor. Use the E command to turn this feature off and on.

E0 disables the echo.

E1 enables the echo.

Result Codes Enable/Disable

n = 0 or 1

Default: Q0

Use the Q command to enable or disable result codes for applications such

as computer-controlled auto dialing.

Q0 (or Q) enables result codes.

Q1 disables result codes for applications such as computer-controlled auto-

dialing.

Result Codes (Verbose/Terse)

n = 0 or 1

Default: V1

The V command controls whether the modem’s result codes display as text

(verbose) or numeric (terse) messages. For example, if no carrier signal is

detected after dialing, the result can display either as NO CARRIER or as

the number 3.

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V0 (or V) displays the modem’s result codes as a number.

V1 displays result codes as text.

V2, an additional command given anytime after ATV1 is entered, displays

the connect message of both the local modem and the remote modem.

Result Codes and Call Progress Selection

n = 0, 1, 2, 3, 4, 5, 6, or 7

Default: X4

Selects which result codes the modem provides in command mode and

determines whether the modem uses smart dialing or blind dialing. When it

smart dials, the modem listens for dial tones and busy signals and responds

to them. When it blind dials, the modem ignores the signals and relies on

timing instead.

X0 causes the modem to blind dial. Instead of looking for a dial tone, it

pauses for the time set in register S6 and then dials regardless. Once a

connection is made, it sends the basic code CONNECT to the terminal. It

ignores any busy signals.

X1 causes the modem to blind dial. In addition to the basic CONNECT

code, it provides extended codes consisting of the word CONNECT and the

speed of the connection (CONNECT 14400 or CONNECT 28800, for

example). In this mode, the modem does not recognize or respond to dial

tones or busy signals.

X2 causes the modem to wait for a dial tone before dialing. If it does not

detect a dial tone within the time set by S6, the modem sends a NO

DIALTONE result code to the terminal. In this mode, the modem provides

extended result codes but does not respond to busy signals.

X3 causes the modem to blind dial and to look for a busy signal. If it detects

one, it sends a BUSY result code to the terminal. In this mode, the modem

provides extended result codes, but it does not respond to dial tones.

X4 causes the modem to look for a dial tone and a busy signal and respond

with NO DIALTONE or BUSY, as appropriate. It also provides extended

result codes. It is the most useful setting for most data communication

programs and is the default setting.

X5 causes the modem to look for a dial tone and a busy signal and respond

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with NO DIALTONE or BUSY, as appropriate. It also provides extended

result codes. It is the most useful setting for most data communication

programs and is the default setting.

X6 causes the modem to look for a dial tone and a busy signal and respond

with NO DIALTONE or BUSY, as appropriate. It also provides extended

result codes. It is the most useful setting for most data communication

programs and is the default setting.

X7 causes the modem to wait for a dial tone before dialing. If it doesn’t

detect a dial tone within the time set by S6, the modem sends only the basic

result code to the terminal (ERROR, NO CARRIER, or CONNECT, for

example). In this mode, the modem does not respond to busy signals.

&Qn Asynchronous Communications Mode

n = 0, 5, or 6

Default: &Q5

Allows you to select the type of asynchronous communications mode for

your modem.

Note: These commands are the same as several of the \Nn commands,

described later in this chapter.

&Q0 selects asynchronous mode with data buffering. This is the same as

\N0, nonerror correction mode with data buffering.

&Q5 selects error control with data buffering. This is the same as \N3,

V.42/MNP auto-reliable mode.

&Q6 selects asynchronous mode with data buffering. This is the same as

\N0, non-error correction mode with data buffering.

Online Connection Commands

The following commands control the conditions of the online connection.

Answer Tone

n = 0, 1, 2, 3, 15, or 16

Default: B1 and B16

Selects the frequency the modem uses for its answer tone. (The answer tone

is the tone transmitted by the receiving modem to the calling modem, thus

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initiating the handshake between the two modems.) At higher speeds

(2400 bps and above) there is no conflict because all protocols use the Bell

frequency of 2225 Hz. Lower speeds require different frequencies.

B0 selects ITU-T V.22 mode when the modem is at 1200 bps.

B1 selects Bell 212A when the modem is at 1200 bps. This is a default.

B15 selects V.21 when the modem is at 300 bps.

B16 selects Bell 103J when the modem is at 300 bps. This is a default.

Dummy Command

-Cn

Data Calling Tone

n = 0 or 1

Default: -C0

The data calling tone is a tone of a certain frequency and cadence, as

specified in the V.25 standards, which identifies whether it is remote data,

fax, or voice. The frequency is 1300 Hz, with a cadence of .5 s on and 2 s

off.

-C0 disables the V.25 data calling tone.

-C1 enables the V.25 data calling tone.

Dummy command

&Gn Guard Tones

n = 0, 1, or 2

Default: &G0 (models outside U.K.) or &G2 (U.K.

models only)

Controls the presence or absence of guard tones from the transmitter when

in answer mode at either 1200 or 2400 bps. Guard tones are used in Europe

and other areas to allow the modem to function in the telephone systems.

Guard tones are not used in the United States. U.K. models are locked at

&G2 (1800 Hz guard tone).

&G0 disables ITU-T guard tones.

&G1 enables ITU-T 550 Hz guard tone.

&G2 enables ITU-T 1800 Hz guard tone.

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Modulation Handshake

n = 0 or 1

Default: N1

Controls whether the local modem performs a negotiated handshake with

the remote modem at connection time when the communication speed of the

two modems is different.

N0 enables handshaking only at the communication standard specified by

S37 and the ATB command.

N1 always begins the handshake only at the communication standard

specified by S37 and the ATB command, but allows fallback to a lower

speed as the handshake proceeds. This is the default.

\Tn

Inactivity Timer

n = 0

Default: \T0

The inactivity timer specifies the length of time, in minutes, that the modem

waits before disconnecting when no data is sent or received. This timer is

specified in register S30. The \T0 command disables the inactivity timer.

Long Space Disconnect

n = 0, 1

Default: Y0

When two modems are connected in reliable mode, a link disconnect

request packet is sent to request a disconnect. In non-error correction mode,

there is no polite way to request a disconnect. As a result, some garbage

may be received when a hang-up command is issued.

Y0 disables the modem’s use of the break signal.

Y1 enables long space disconnect.

RS-232 Interface Commands

These commands define how the ISIHP-2S/2U modems use and respond to

standard

RS-232 signals.

&Cn Carrier Detect Control

n = 0 or 1

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Default: &C1

Allows you to control the Carrier Detect (CD) signal on the RS-232/V.24

interface. This is a signal from the modem to your computer indicating that

the carrier signal is being received from a remote modem. Normally, CD

goes high (turns on) when the modem detects a carrier on the

communications link and drops (turns off) when it loses the carrier. By

using &C, you can force the signal to stay high, or to drop momentarily

when the remote modem disconnects. This option is useful with some CBX

phone systems and mainframe front ends, which require CD to act in this

manner.)

&C0 ignores the state of the carrier from the remote modem. CD is forced

high.

&C1 allows CD to act normally—to go high when the modem detects a

carrier, and to drop when it loses the carrier.

&Dn Data Terminal Ready Control

n = 0, 1, 2, or 3

Default: &D2

The Data Terminal Ready (DTR) signal on pin 20 of the RS-232/V.24

interface must be high, or on, in order for the modem to operate. A high

DTR signal tells the modem that the computer it is connected to is ready to

communicate through the modem.

The DTR signal can also be used to cause the modem to reset to its default

parameters, as if you had given the modem an ATZ command.

&D0 (or &D) causes the modem to ignore the DTR signal and treat it as

always on.

&D1 causes the modem, if in online data mode, to enter command mode,

issue an OK and remain connected when the DTR drops.

&D2 causes the modem to hang up when DTR drops while the modem is in

online data mode.

&D3 causes the modem to reset when DTR drops . It will also hang up if it

is online.

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&Sn

Data Set Ready Control

n = 0 or 1

Default: &S0

Controls the state of the Data Set Ready (DSR) signal on the RS-232/V.24

interface. Normally, DSR follows CD. You can force the signal high or

allow it to act normally.

&S0 forces DSR high (on).

&S1 allows DSR to act normally, that is, to follow CD.

Error Correction and Data Compression Commands

You can configure modems to any of three different V.42 modes of

operation (with or without compression): non-error correction, auto-

reliable, and reliable modes. You also can turn data compression on or off.

\Nn

Error Correction Modes

n = 0, 1, 2, 3, 4, 5, or 7

Default: \N3

Select the modem’s error correction mode using the \N command.

\N0 disables the modem’s V.42 error correction capabilities, and the modem

functions as a non-error correction modem with data buffering. This is the

same as &Q6, described earlier in this chapter.

\N1 causes the modem to function in direct mode.

\N2 enables reliable mode, in which the modem uses its V.42 error

correction capabilities for all transmissions. In reliable mode, the modem

must be connected to a modem with the V.42 MNP protocol.

\N3 enables auto-reliable mode. During the handshaking procedures at the

start of the online connection, the modem queries whether the other modem

is using V.42 error correction. If the modem determines that the other

modem is using V.42, it switches itself into reliable (V.42) mode and

enables error correction. If it determines that the other modem is not using

V.42, the modem remains in non-error correction mode. (This is the same as

\N5 and \N7.)

\N4 enables reliable mode, in which the modem uses its V.42 error

correction capabilities for all transmissions. In reliable mode, the modem

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must be connected to a modem with a V.42 protocol (MNP or LAP-M).

The V.42 standard includes MNP Class 3 and 4 and LAP-M error correction

methods.

\N5 enables auto-reliable mode. During the handshaking procedures at the

start of the online connection, the modem queries whether the other modem

is using V.42 error correction. If the modem determines that the other

modem is using V.42, it switches itself into reliable (V.42) mode and

enables error correction. If it determines that the other modem is not using

V.42, the modem remains in non-error correction mode. (This is the same as

\N3 and \N7.)

\N7 enables auto-reliable mode. During the handshaking procedures at the

start of the online connection, the modem queries whether the other modem

is using V.42 error correction. If the modem determines that the other

modem is using V.42, it switches itself into reliable (V.42) mode and

enables error correction. If it determines that the other modem is not using

V.42, the modem remains in non-error correction mode. (This is the same as

\N3 and \N5.)

%Cn Data Compression

n = 0 or 1

Default: %C1

The %C command allows you to disable data compression. Data

compression is normally enabled.

%C0 disables V.42bis/MNP 5 data compression.

%C1 enables V.42bis/MNP 5 data compression.

Immediate Action Commands

Use immediate action commands to obtain information about AT commands

and current modem settings.

Repeat Last Command

Default: None

Type A/ to repeat the previous command. Do not precede this command

with AT or press ENTER to execute it.

Information Request

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n = 0

Default: none

This command displays specific product information about your modem.

I0 or I returns the controller firmware version number. Use this command to

identify your modem’s firmware level before calling Multi-Tech Technical

Support. (Same as I3.)

&Bn

Dummy command

View Current Configuration

Default: none

Use the &V command to display the active modem settings.

Flow Control Commands

Flow control refers to techniques used by data terminal equipment and the

modem to pause and resume the flow of information between them. It

prevents a device from accepting more data than it can handle. The modem

implements flow control in both directions. When the modem halts the flow

of data, it is called flow control. When the computer halts the flow, it is

called pacing.

&Kn Local Flow Control Selection

n = 0, 3, or 4

Default: &K3

Allows you disable flow control and enable hardware or software flow

control.

&K0 completely disables data flow control initiated by the modem. (Same

as \Q0.)

&K3 enables modem’s use of Clear to Send (CTS) signal on the RS-232/

V.24 interface to regulate data flow. When CTS drops, data flow is

suspended until the signal goes high (on) again. This method of flow control

works in conjunction with pacing (i.e., computer-initiated flow control),

which uses the Request to Send (RTS) signal on the RS-232/V.24 interface.

Hardware flow control cannot be enabled unless an active error correction

protocol is selected. This is the factory default setting. (This is the same as

\Q3.)

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&K4 enables XON/XOFF software flow control. XON/XOFF flow control

is an in-band method of data flow regulation. In-band data regulation means

that the XON (^Q) and XOFF (^S) characters are inserted into the stream of

data rather than using separate control lines. When an XOFF character is

detected, the data stream is suspended until an XON character is detected. If

you issue the &K4 command to the modem, it will respond to XON/XOFF

pacing, and use XON/XOFF characters as its own method of flow control to

the computer. (This is the same as \Q1.)

The drawback to using this method of pacing is that some files may contain

these characters as part of the file data. If such a file is transferred using a

modem with XON/XOFF flow control enabled, the file transfer could fail

due to indefinite suspension.

\Qn

Local Flow Control Selection

n = 0, 1, or 3

Default: \Q3

Allows you disable flow control and enable hardware or software flow

control.

\Q0 completely disables data flow control initiated by the modem. (This is

the same as &K0.)

\Q1 enables XON/XOFF software flow control. XON/XOFF flow control is

an in-band method of data flow regulation. In-band data regulation means

that the XON (^Q) and XOFF (^S) characters are inserted into the stream of

data rather than using separate control lines. When an XOFF character is

detected, the data stream is suspended until an XON character is detected. If

you issue the &K4 command to the modem, it will respond to XON/XOFF

pacing, and use XON/XOFF characters as its own method of flow control to

the computer. (This is the same as &K4.)

The drawback to using this method of pacing is that some files may contain

these characters as part of the file data. If such a file is transferred using a

modem with XON/XOFF flow control enabled, the file transfer could fail

due to indefinite suspension.

\Q3 enables modem’s use of Clear to Send (CTS) signal on the RS-232/

V.24 interface to regulate data flow. When CTS drops, data flow is

suspended until the signal goes high (on) again. This method of flow control

works in conjunction with pacing (i.e., computer-initiated flow control),

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which uses the Request to Send (RTS) signal on the RS-232/V.24 interface.

Hardware flow control cannot be enabled unless an active error correction

protocol is selected. This is the factory default setting. (This is the same as

&K3.)

\Xn

XON/XOFF Pass-Through

n = 0, 1

Default: \X0

When XON/XOFF pacing is active, the local modem has two options

regarding the XON and XOFF characters. It can respond to and discard the

characters from the computer, or it can respond to the characters and pass

them through the data communications link to the remote modem, thereby

pacing the remote modem as well.

\X0 causes the modem to respond to and discard the XON and XOFF

characters (default)

\X1 causes the modem to respond to and pass on the XON and XOFF

characters

\Jn

Data Buffer Control

n = 0

Default: \J0

\J0 disables force line rate less than or equal to DTE rate

\J1 enables force line rate less than or equal to DTE rate

\Kn

Set Break Control

n = 0, 1, 2, 3, 4, 5

Default: \K5

Determines how the modem processes a break signal received from the

local DTE during an online connection.

\K5 causes the modem to send the break to the remote modem in sequence

with transmitted data, non-destructive, non-expedited.

Escape Sequences

Escape sequences are also known as escape codes. They are used to cause

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the modem to enter command mode from online mode without

disconnecting the call.

+++AT<cr>

In-Band Escape Sequence

If the modem is online with a remote modem, you can cause the modem to

enter command mode without disconnecting the call by typing an escape

code. The default escape code used by the modem is three plus signs (+++)

followed by the letters AT, up to 10 command characters (most typically H,

to hang up), and ENTER. The modem then escapes to command mode,

executes the command (if any), and remains in command mode. For

example, to hang up the modem at the end of a call, type +++ATH <cr>.

Force Answer Mode

You can use the A command to force the modem into answer mode. Type

ATA when in command mode to immediately bring your modem off-hook,

out of command mode, into online answer mode, and to cause it to transmit

its carrier signal over the phone line. If no responding carrier tone is

received by your modem within 45 seconds (or by the time you specified in

back into command mode.

Go Back Online

n = 0, 1, or 3

Default: none

Use the O command to bring the modem out of command mode and back

into online mode. The O command reverses the result of entering the escape

code. The O command brings modem into the online mode (originate or

answer) it was in prior to entering command mode.

O0 causes the modem to exit command mode and return to online data

mode.

O1 causes the modem to issue a retrain before returning to online data

mode.

O3 causes the modem to issue a rate renegotiation before returning to

online data mode.

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Modem S-Registers

S-registers are small regions of memory where modem configuration

information is stored. Whereas AT commands tell a modem what to do, S-

registers tell the modem how to do it. Each S-register has a name that

consists of the letter S and a number (S0, S1, S2, etc.), hence the term S-

the Sr=n command to change it.

Number of Rings Until Modem Answers

Unit: 1 ring

Range: 0–255

Default: 0

Defines number of rings the modem waits before answering an incoming

call. Default value is zero, which effectively disables the auto-answer

function. When auto-answer is disabled, the modem can only answer via the

ATA command. Set the S0 register value to one to cause the modem to

answer the call immediately after the first ring. Maximum number of rings

that can be configured is 255.

Ring Count

Unit: 1 ring

Range: 0–255

Default: 0

Counts number of rings that have occurred. It is a read type of register and

is seldom used in typical operation. Each time an incoming ring signal is

detected, S1 increases its value by one, up to a maximum of 255. If you set

S1 to a value other than its default value of zero, or if the value is increasing

with rings, this new value remains stored in S1 for eight seconds after the

last ring is counted, after which the value reverts back to zero.

Escape Code Character

Unit: Decimal

Range: 0–255

Default: 43 (+)

Defines escape code character by its decimal ASCII code. Default character

is the plus (+) sign (decimal 43). S2 can be set for any ASCII character.

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Setting an S2 value greater than 127 results in no escape character, resulting

in no means of entering command mode from online mode without breaking

the online connection unless you use the BREAK method.

Note: If you change the S2 value, you must make corresponding changes in

your data communications software.

Return Character

Unit: Decimal

Range: 0–127

Default: 13 (^M)

Defines carriage return character by its decimal ASCII code. Default setting

is the ^M character (decimal 13), the code for ENTER on most keyboards.

Can be set for any ASCII character.

Note: If you change the S3 value, you must make corresponding changes in

your data communications software.

Line Feed Character

Unit: Decimal

Range: 0–127

Default: 10 (^J)

Defines the line feed character by its decimal ASCII code. Default setting is

^J (decimal 10), the code for the line feed key on most keyboards that have

such a key. Can be set for any ASCII character.

Backspace Character

Unit: Decimal

Range: 0–127

Default: 8 (^H)

Defines backspace character by its decimal ASCII code. Default setting is

the ^H character (decimal 8), the code for BACKSPACE on most

keyboards. Can be set for any ASCII character. Setting S2 to a value greater

than 32 disables the backspace character.

Note: If you change the S5 value, you must make corresponding changes in

your data communications software.

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Wait Time for Dial Tone

Unit: 1 second

Range: 2–65 (North America), 4–255 (International), 4–7

(U.K.)

Default: 2 (North America), 4 (International and U.K.)

Defines length of time the modem waits after ENTER is pressed before

carrying out a dial command. Default setting is two seconds for North

America, four seconds elsewhere.

Time to Wait for Carrier

Unit: 1 second

Range: 1–255 (USA), 1–45 (Canada and International),

or 1–55 (UK)

Default: 50 (North America and International) or 55

(U.K.)

Determines amount of time the modem waits for a carrier signal before it

disconnects. Default value is 50 seconds except the UK model, which

defaults to 55 seconds. After dialing, the modem waits for a carrier signal

for up to 50 or 55 seconds and if none is detected, terminates the call.

Maximum S7 value is 255 seconds for the US model, 45 seconds for

Canadian and International models, and 55 seconds for the UK model. S7

also determines the wait for silence time for the @ dial modifier.

Pause Time for Comma

Unit: 1 second

Range: 0–65 (North America), 4–255 (International), 4–7

(UK)

Default: 2 (North America), 4 (International and UK)

Determines the length of pause caused by a comma character in a dialing

command. Default setting is two seconds for North American model and

four seconds for international and UK models. S8 can be set for up to 65

seconds. S8 also defines the length of time the modem waits before retrying

a call after it detects a busy signal. Some computer systems need more than

two seconds to reset. If this is the case, increase the value of S8.

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Carrier Loss Disconnect Delay Time

S10

Unit: 100 ms

Range: 1–254

Default: 20

Defines the length of time, in milliseconds, that the modem waits after a

loss of carrier signal before the it disconnects. The default setting is 2000

ms (20 units of 100 ms each). Maximum delay is 25400 milliseconds, or

25.4 seconds (decimal 254).

S11

Tone Dialing Spacing and Duration

Unit: 1 ms

Range: 50 - 150 (US) or 80–255 (Canada, UK,

International)

Default: 95 (US) or 80 (Canada, UK, International)

Sets the speed of tone dialing (spacing and tone duration times). The default

value is 95 units for domestic models and 80 units for Canadian and

International models, where each unit is one ms. In other words, for

domestic modems, each tone is sustained for 95 ms followed by a 95 ms

pause. The minimum S11 value allowed is 50 ms (50 units). The maximum

S11 value is 150 ms (150 units).

S28

Enable / Disable V.34 Modulation

Unit: decimal

Range: 0, 1–255

Default:1 (enabled)

Enables or disables V.34 modulation. Setting S28 to zero (0) disables V.34

modulation. Any other setting (1-255) enables V.34 modulation.

S35

Data Calling Tone

Unit: decimal

Range: 0–1

Default: 0 (disabled)

Enables or disables the V.25 data calling tone, which allows remote data,

fax and voice discrimination. Setting S35 to zero (0) disables V.25 data

calling tone; setting S35 to 1 enables data calling tone. The default setting is

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S37

Maximum Dial Line Rate

Unit: decimal

Range: 0–19

Default: 0

Sets the maximum dial line rate. When set to zero (0), the maximum dial line

rate is the same as the maximum modem speed. This is the most common

setting and allows other modem functions to actually determine the line rate

used for each connection. It is the default. Consider using S37 to set a

maximum dial line rate if you need to artificially retain a lower modem speed.

0 = maximum modem speed

1 = reserved

13 = 19200 bps

14= 21600 bps

15 = 2400 bps

16 = 26400 bps

17 = 28800 bps

18 = 31200 bps

19 = 33600 bps

2 = 1200/75 bps

3 = 300 bps

4 = reserved

5 = 1200 bps

6 = 2400 bps

7 = 4800 bps

8 = 7200 bps

9 = 9600 bps

10 = 12000 bps

11 = 14400 bps

12 = 16800 bps

S42

Enable / Disable Auto Rate

Unit: decimal

Range: 0-1

Default: 1 (enabled)

Enables and disables the 56K auto rate. Retrain and fallback are disabled in

data mode. Set S42 to zero (0) to disable auto rate, or 1 (the default) to

enable auto rate.

S43

Enable / Disable V.32bis Start-up Auto Mode

Unit: decimal

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Range: 0-1

Default: 1 (enabled)

Used for testing and debugging only. Enables and disables V.32bis start-up

auto mode operation. Set S43 to zero (0) to disable start-up auto mode, or 1

(the default) to enable start-up auto mode.

S89

Off-line Time

Unit: 1 second

Range: 0, 5-255

Default: 0

Sets the length of time, in seconds, a modem waits in the off-line command

mode before it goes into standby mode. If S89 is set to 20 seconds, the

modem waits 20 seconds in off-line command mode before going into

standby mode. Setting S89 to zero (0) prevents the modem from ever

entering standby mode.

Setting S89 to any value between zero and five (1-4) effectively sets the

value to five, because five seconds is the minimum possible wait time.

S108

Line Code Control

Unit: Decimal

Range: 0, 1

Default: 1

Controls the line coding used by the modem.

S108 = 0

S108 = 1

mu-law

A-law (default)

S109

PCM Mode Control

Unit: Decimal

Range: 0–2

Default: 1

Controls the PCM ( pulse code modulation) mode (V.90 or K56Flex).

Determines which mode the modem will answer in for PCM connections.

S109 = 0

S109 = 1

S109 = 2

K56Flex support only

Both V.90 and K56Flex supported

V.90 support only

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Reading and Assigning S-Register Values

Use the S command to assign a value to an S-register and to read an it’s

current value. To read an S-register value, in terminal mode, type S, the S-

to display the value of register S7, type ATS7? and press ENTER. The

value appears as a three-digit decimal number (e.g., 045).

To assign a new value to an S-register, type S, the S-register number, an

equals sign (=), and a decimal number. Convert all ASCII characters to their

decimal equivalents before entering. Valid S-register decimal values are

shown for each register in the previous section. To make the change

permanent, use the &W0 command.

Examples of Assigning Values

1. You want to have longer pauses caused by the comma in a dial

command: five seconds instead of two. Type ATS8=5 to assign 5 as

the value for register S8. The modem now pauses five seconds for

every comma in a dial command.

2. You want to configure your modem to answer incoming calls after

the fourth ring instead of after the first ring. To configure register

S0 with a value of 4, type ATS0=4 and press ENTER.

3. You are calling long distance to another country code, and it is

taking a long time to connect. The register S7 (time to wait for

carrier) factory default setting of 50 seconds is insufficient; a time-

out occurs and cancels the call before a connection is made. To

change the S7 value to 75 seconds, type ATS7=75 and press

ENTER . Now, after dialing, the modem allows 25 more seconds

for a carrier signal before aborting the call. The additional 25

seconds should provide enough time for international calls.

Examples of Reading Values

1. To verify that you entered the value correctly in the preceding

examples, type ATS8? and press ENTER in the first example,

ATS0? in the second example, and ATS2? in the third example.

You should receive the responses 005, 004, and 075, respectively.

2. When configuring S-registers, it is a good practice to include the

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verification read command in the same command string as the

configuration assignment command. In the three preceding

examples, type ATS8=5S8?, ATS0=4S3?, and ATS7=75S7?,

respectively.

AT Commands that Affect S-Registers

For maximum throughput, the ISIHP’s default configuration is for

originating a call to another 33,600 bps modem that supports error

correction, data compression, and flow control. If the receiving modem is

not compatible, the ISIHP can match any ITU-T or Bell standard modem

(but not proprietary protocols).

If you require a different configuration for your application—for example,

if you want to use an ISIHP modem strictly as an auto answering device or

for service that does not support error correction—you can change the

command parameters and S-register values in active memory and save the

new values with the &W command.

The &W0 (or &W) command stores all current AT command and S-register

values into nonvolatile random access memory (NVRAM) and configures

the modem so that it reads your custom settings in NVRAM when the

modem is turned on or when it is reset with the Z command. (The &F reset

command will continue to read the factory default settings in read-only

memory [ROM].) For convenience, you can include the &W command in

the same command string that sets the new values in active memory as in

the following example: AT\N2&C1S0=10&W0<cr>

Modem Result Codes

Terse

Verbose

Definition

Command executed without error;

ready for next command.

CONNECT

RING

Modem has detected carrier and gone

online.

Modem has detected ring caused by

incoming call.

NO CARRIER

No carrier signal has been detected

within the allowed time.

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ERROR

Error in command line (too many, or

invalid characters).

CONNECT 1200 Modem detected carrier at 1200 bps

and gone online.

NO DIALTONE No dial tone detected.

BUSY

Busy signal detected.

NO ANSWER

The remote system did not answer.

CONNECT 2400 Modem detected carrier at 2400 bps

and gone online.

CONNECT 4800 Modem detected carrier at 4800 bps

and gone online.

CONNECT 9600 Modem detected carrier at 9600 bps

and gone online.

CONNECT 14400 Modem detected carrier at 14400 bps

and gone online.

CONNECT 19200 Modem detected carrier at 19200 bps

and gone online.

CONNECT 7200 Modem detected carrier at 7200 bps

and gone online.

CONNECT 12000 Modem detected carrier at 12000 bps

and gone online.

CONNECT 16800

Modem detected carrier at 16800 bps

and gone online.

CONNECT 300

Modem detected carrier at 300 bps

and gone online.

CONNECT 21600

CONNECT 24000

CONNECT 26400

Modem detected carrier at 21600 bps

and gone online.

Modem detected carrier at 24000 bps

and gone online.

Modem detected carrier at 26400 bps

and gone online.

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CONNECT 28800

CONNECT 31200

CONNECT 33600

CONNECT 45000

CONNECT 56000

DELAYED

Modem detected carrier at 28800 bps

and gone online.

Modem detected carrier at 31200 bps

and gone online.

Modem detected carrier at 33600 bps

and gone online.

Modem detected carrier at 45000 bps

and gone online.

Modem detected carrier at 56000 bps

and gone online.

Delay is in effect for the dialed

number.

BLACKLISTED

The dialed number is blacklisted.

The blacklist is full.

BLACKLIST FULL

Extended Result Codes. If the extended result codes configuration option

is enabled, EC is added to the following result codes:

CONNECT 1200

10 CONNECT 2400

11 CONNECT 4800

12 CONNECT 9600

13 CONNECT 14400

14 CONNECT 19200

24 CONNECT 7200

25 CONNECT 12000

86 CONNECT 16800

40 CONNECT 300

55 CONNECT 21600

56 CONNECT 24000

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AT Commands and S-Registers

57 CONNECT 26400

58 CONNECT 28800

59 CONNECT 31200

60 CONNECT 33600

CONNECT 45000

CONNECT 56000

EC is replaced by one of the following codes, depending on the type of

error control connection:

Code

Error Correction

V42bis

V42

LAP-M V.42 error control and V.42bis data compression

LAP-M V.42 error control only

MNP5

MNP4

NoEC

MNP4 error control and MNP 5 data compression

MNP 4 error control only

No error control protocol

Terminal Adapter AT Commands

One of the ways you can communicate with and configure your terminal

adapter (TA) is to use AT commands. AT commands are so-called because,

with only a few exceptions, each command string begins with the characters

AT. Using AT commands, you can read and set parameters and perform

actions such as dialing.

Entering AT Commands

You can send AT commands to the TA by typing them on the keyboard, by

typing them in the terminal window of a data communications program such

as HyperTerminal, or indirectly by configuring your data communications

program.

Enter AT commands in the following format: AT <command string> <cr>.

The AT characters cause the TA to interpret the following string of

characters as a command. The command string consists of one or more

commands. The carriage return character, <cr>, sends the command string

to the TA. If you are entering a command string in your communication

program’s terminal window, insert the carriage return character by pressing

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ENTER. On the other hand, if you are configuring a communications

program, you typically must insert the carriage return character by adding

^M to the end of the command string.

The TA has three modes of operation: offline command mode (the default

state), online command mode, and data mode. The TA responds to AT

commands only when it is in one of the command modes. After the TA

establishes a connection and goes online in data mode, it interprets any

further characters you enter as data rather than commands and transmits

them to the remote device.

When the TA is in data mode, you can switch it to online command mode by

sending it an escape sequence. The TA responds to two types of escape

sequences: in-band (escape sequence is part of the data stream) and out-of-

band (escape sequence is outside the data stream). The in-band escape

sequence is +++AT<cr>; the out-of-band escape sequence is <break

>AT<cr>. You can change the in-band escape character (+) by changing the

value in register S2. You can send the break signal in the out-of-band escape

sequence only from software, not by pressing SHIFT+BREAK on your

keyboard.

When it detects the escape sequence, the TA enters online command mode,

in which it responds to commands while maintaining the connection with

the remote device.

The TA ’s command buffer can store 80 characters, including spaces and

other characters used in telephone numbers. If you mistype a command

string, you can edit it by using the backspace key, but only before you press

ENTER. As you type a command string, it appears on your monitor screen,

letting you verify your input as you type it.

AT commands recognized by the ISIHP terminal adapter are listed by

function on the following page. For an alphabetic list of AT commands, see

AT commands in the index. The commands in this chapter are organized by

function. Abbreviated commands are listed on the following page by

function along with a short description and page numbers that refer to a

more detailed description, immediately following this list.

Topic

Command

Description

Attention code

Command Implementation, p. 107AT

Return

Command execution

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+++AT<cr>

In-band escape code

Out-of-band escape code

Dialing method

Switch type

Switch Configuration, p. 108 %A97

!C0

!C6

*!C6

!D3

*!D3

SPID 1

SPID 2

SAPI-0 data TEI

SAPI-0 voice TEI

List DN, SPID, TEI,

Data

protocol & switch type

>Dn

Embedded Protocol

Analyzer

!N1, !N2, !DN1, !DN2, !EN1, !EN2

*!N1, *!N2, *!DN1, *!DN2, *!EN1, *!EN2

!Z=n

Data DN/MSN

Modem DN/MSN

Rate adaptation protocol

Serial Port Configuration, p. 114 En

Command mode echo

List telephone numbers

List current operating

parameters

List S-register values

Display low level ISDN

status

Sr=n

Sr?

Status displays

Set S-register

Read S-register

Terse/verbose result

codes

Connect messages

Restore parameters to

current power-up profile

&Cn

DCD (Data Carrier

Detect) control

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&Dn

DTR (Data Terminal

Ready) control

&En

#Xn

Flow control

Send Single Multiple

Xoff Characters

&Fn

&Rn

&Sn

Load quick setup factory

profile

CTS (Clear To Send)

control

DSR (Data Set Ready)

control

&Wn

&Zn=

DSn

View port configuration

Store active profile

Store telephone number

Dial a Stored telephone

number

$Dn

Persistent DTR dialing

%En

Escape sequence

options

@P3=

@P4=

@P6=

$MBn

Parity

Data bits

Stop bits

V.110 Network Rate

Answer

Data Call Commands, p. 124

Dial

Hang up

Display product

information

Return online

@Config

Start ConfigMenu

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Command Implementation

AT Attention Code

Values: n/a

Default: n/a

AT precedes all command strings except the A/ command and escape codes.

RETURN Command Execution

Values: n/a

Default: n/a

Press the RETURN (ENTER) key to carry out a command. The RETURN

key is sometimes abbreviated <cr> in command examples.

+++AT<cr> In-Band Escape Code

Values:ASCII

Default: + (43)

Sets the TA to enter command mode without disconnecting the call when it

is online with a remote device. The default escape code is three +

characters, followed by AT, up to 80 command characters, and a RETURN

(press ENTER). The TA escapes to command mode, executes any

commands in the string, and then remains in command mode. Use the S2= z

command to change the escape character.

<break>AT<cr> Out-of-Band Escape Code

Values: n/a

Default: n/a

Places the TA in command mode while remaining online. Enter a break

signal, the letters AT, up to 80 command characters, and a RETURN (press

ENTER).

Switch Configuration Commands

Use the following commands to select your network switch type (e.g.,

Northern Telecom DMS-100) and to specify other information required to

make an ISDN connection.

%A97=n Dialing Method

Values: n = 0 or 1

Default: %A97=0 (En bloc)

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Standardized ISDN signalling protocols such as DSS1, DSS2, and SS7

support sending complete indication, a signal that no more digits will

follow. Adding such a signal to a telephone number is often impractical;

therefore, many private networks send the number of a called party using a

procedure called overlap sending, in which no sending complete indication

is sent. Computer users can automatically append the sending complete

indication to the telephone number by choosing the en bloc method of

sending, which results in faster call setup. Use the %A97= command to

select between the two methods.

%A97=0 En bloc sending during call SETUP

%A97=1Overlap sending during call SETUP

!C0=n Network Switch Type

Values: n = 0, 1, 2, or 5

Default: !C0=2 (International—NET3)

!C0=5 (USA—US N1-1)

Selects one of the network switch types supported by the ISIHP-2S/2U.

International factory default setting is !C0=1 (Northern Telecom DMS-

100). Default for USA is !C0=5 (USA—US N1-1).

!C0=0 AT&T 5ESS

!C0=1 Northern Telecom DMS-100

!C0=2 NET3 (Euro ISDN)

!C0=5 US NI-1

!C6=n SPID 0

Values: n = 0–20-character string

Default: null string

Specifies the channel 0 service profile identifier (SPID) that the ISDN

service provider assigned at subscription time. The data SPID string can

have up to 20 characters.

Note: For DMS-100 switches, any ASCII character except the underline (_)

character is valid. For NI-1 and AT&T switches, only the digits 0–9 are

valid. (Not needed for NET3 switch type.)

*!C6=n SPID 1

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Values: n = 0- to 20-character string

Default: null string

Specifies the channel 1 service profile identifier (SPID) that the ISDN

service provider assigned at subscription time. The voice SPID string can

have up to 20 characters.

Note: For DMS-100 switches, any ASCII character except the underline (_)

character is valid. For NI-1 and AT&T switches, only the digits 0–9 are

valid. (Not needed for NET3 switch type.

!D3=n TEI 0

Values: n = 0–63, 240 (auto), 241 (disable)

Default: !D3=240 (Auto TEI)

Sets the terminal endpoint identifier (TEI) for channel 0. A TEI is a number

used by the central office switch to identify uniquely each device that is

connected to the network. When it uses dynamic TEI assignments (auto

TEI), the central office switch assigns a TEI each time the TA connects to

the network. If your ISDN service provider assigned a fixed TEI at

subscription time, you must configure the TA with the fixed TEI number.

You can also use !D3= to disable the data channel, which may be useful

when multiple TAs are attached to a network terminator bus.

!D3=0–63 Sets the TEI to a fixed value from 0

through 63

!D3=240 Sets the data channel for dynamic TEI

negotiation (factory default)

!D3=241

Disables TEI

*!D3=n TEI 1

Values: n = 0–63, 240 (auto), 241 (disable)

Default: *!D3=240 (Auto TEI)

Sets the terminal endpoint identifier (TEI) for channel 1. A TEI is a number

used by the central office switch to identify uniquely each device that is

connected to the network. When it uses dynamic TEI assignments (auto TEI),

the central office switch assigns a TEI each time the TA connects to the

network. However, the ISDN service provider may assign a fixed TEI at

subscription time, in which case you must configure the TA with the fixed TEI

number.

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*!D3=0-63

Sets the TEI to a fixed value from 0

Sets voice channel for dynamic TEI

through 63

*!D3=240

negotiation (factory default)

*!D3=241

Disables TEI

!L Display Network Configuration

Values: n/a

Default: n/a

Displays the current DN, SPID, TEI, Data protocol, and switch type.

Displays the current network configuration

>Dn Embedded Protocol Analyzer

Values: 0, 1, 2, 3, 98, or 99

Default: n/a

Records and analyzes various protocols on the B-channel, D-channel, and

DTE-DCE interface. The Embedded Protocol Analyzer is useful as a

diagnostic tool, in that essential data messages display, which enables you to

observe interactive operations of the TA, Central Exchange, and remote

communications equipment.

>D0

>D1

>D2

>D3

Displays B-channel traffic, decoded as

V.120

Displays D-channel traffic, decoding layers

2 and 3 (Q.921 and Q.931)

Displays D-channel traffic, decoding layer 2

only (Q.921)

Displays D-channel traffic, decoding layer 3

only (Q.931)

>D5

>D6

Displays async PPP data

Displays sync PPP data

>D98 Disables Embedded Protocol Analyzer,

buffered data unchanged

>D99 Enables Embedded Protocol Analyzer,

clearing buffered data

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!N1=n DN0

Sets the Data Directory Number /Multiple Subscriber Number (DN/MSN)

for data ports 1 and 2. The DN/MSN is a number assigned to the BRI at

subscription time by the ISDN service provider. The DN/MSN is a string of

up to 25 characters; valid characters are 0-9, the * character, and the #

character. If used as an MSN, a subaddress can be added to the number (if

one is needed) by using the : character followed by the subaddress number.

!N1=n sets the Data DN/MSN for port 1

!N2=n sets the Data DN/MSN for port 2

Usage: !N1=n

Function:Data DN/MSN

Values: n = 25-character string

Default: null string

Description: Data DN/MSN 1 can be set to the same

value as Data DN/MSN 2 and it can also be set to the

same value as Modem DN/MSN 1 and/or 2. A call

accepted by Data DN/MSN 1 will be routed to TA port 1.

Usage:

!N2=n

Function: Data DN/MSN 2

Values: n=25-character string

Default: null string

Description: Data DN/MSN 2 can be set to the same

value as Data DN/MSN 1 and it can also be set to the

same value as Modem DN/MSN 1 and/or 2. A call

accepted by Data DN/MSN 2 will be routed to TA port 2.

Usage:

!DNn

Function: Disable Data DN/MSN n

Values: n=1 (disable Data DN/MSN 1),

n=2 (disable Data DN/MSN 2)

Default: All ports are enabled by default

Description: !DNn disables a Data DN/MSN which will

effectively disable the associated TA port from receiving

any data calls. However, the port will still be able to

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originate data calls. This is useful for applications where

a specific port is for dial-out only.

Usage:

!ENn

Function: Enable Data DN/MSN n

Values: n=1 (enable Data DN/MSN 1),

n=2 (enable Data DN/MSN 2)

Default: All ports are enabled by default

Description: !ENn enables a Data DN/MSN which will

put it back in service for accepting and originating data

calls.

*!N1=n DN 1

Sets the Modem Directory Number /Multiple Subscriber Number (Modem

DN/MSN) for modem ports 1 and 2. TheModem DN/MSN is a number

assigned to the BRI at subscription time by the ISDN service provider. The

Modem DN/MSN is a string of up to 25 characters; valid characters are 0-9,

the * character, and the # character. If used as an MSN, a subaddress can be

added to the number (if one is needed) by using the : character followed by

the subaddress number.”

*!N1=n sets the Modem DN/MSN for port 1

*!N2=n sets the Modem DN/MSN for port 2

Usage:

*!N1=n

Function: Modem DN/MSN 1

Values: n=25-character string

Default: null string

Description: Modem DN/MSN 1 can be set to the same

value as Modem DN/MSN 2 and it can also be set to the

same value as Data DN/MSN 1 and/or 2. A call accepted

by Modem DN/MSN 1 will be routed to the first modem.

Usage:

*!N2=n

Function: Modem DN/MSN 2

Values: n=25-character string

Default: null string

Description: Modem DN/MSN 2 can be set to the same

value as Modem DN/MSN 1 and it can also be set to the

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same value as Data DN/MSN 1 and/or 2. A call accepted

by Modem DN/MSN 2 will be routed to the second

modem.

Usage:

*!DNn

Function: Disable Modem DN/MSN n

Values: n=1 (disable Modem DN/MSN 1),

n=2 (disable Modem DN/MSN 2)

Default: All ports are enabled by default

Description: *!DNn disables a Modem DN/MSN which

will effectively disable the associated modem port from

receiving any modem calls. However, the port will still

be able to originate modem calls. This is useful for

applications where a specific port is for dial-out only.

Usage:

*!ENn

Function: Enable Modem DN/MSN n

Values: n=1 (enable Modem DN/MSN 1),

n=2 (enable Modem DN/MSN 2)

Default: All ports are enabled by default

Description: *!ENn enables a Modem DN/MSN which

will put it back in service for accepting and originating

modem calls.

!Z=n Rate Adaptation Protocol

Values: n = 5, 6, 9, or 12

Default: !Z=9 (PPP)

Selects the rate adaptation protocol used to communicate with another

terminal adapter. The local and remote terminal adapters must be set to the

same protocol for communication to take place.

!Z=5

!Z=6

!Z=9

!Z=12

V.120 protocol

V.110 protocol

PPP protocol

X.75 protocol

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Serial Port Configuration Commands

Use the following commands to control the interaction between the TA and

the computer connected to it.

En Command Mode Echo

Values: n = 0 or 1

Default: E1 (Echo on)

When you enter commands, the TA echoes the characters back to the

computer or terminal where they appear on the monitor. This command

turns this feature on and off.

Echo off

Echo on

L5 and L6 List Active Profile

Values: n = 5 or 6

Default: none

Lists current operating parameters of the TA. This information is useful

when changing communications software or when changing default settings.

ATL5 lists AT command parameters, and ATL6 lists values currently stored

in the S-Registers.

L8 Lists Low Level ISDN Status

Qn Enable/Disable Result Codes

Values: n = 0, 1, or 2

Default: Q0 (Enable result codes)

Controls whether the TA sends result codes to the computer. (Use the V

command to select the format of the result codes.)

Enable result codes.

Disable result codes (quiet mode) for

applications such as computer-controlled

auto dialing.

Sr=n Set S-Register

Values: r = 0, 2–5, 7, 8, 10, 25, 32, 34, 50, 52-57, 75-

77, 80; n varies

Default: None

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Sets the value of an S-register, where r is the number of the S-register, and n

is the value you want to set.

Sr? Read S-Register

Values: r = 0–5 (S1 is read only) , 7, 8, 10, 25, 32, 34,

50, 52-57, 75-77, 80;

Default: None

n varies

Reads the value of an S-register, where r is the number of the S-register.

Vn Terse/Verbose Result Codes

Values: n = 0 or 1

Default: V1 (Verbose)

Controls whether the TA’s result codes display as digits (terse) or as words

(verbose). (Use the Q command to enable or disable the display of result

codes.)

Enable terse result codes.

Enable verbose result codes.

Xn Connect Messages

Values: n = 0-5

Default: X2 (Enable all messages) and

(Disable printing CLI with CONNECT message)

Selects the result code messages that the TA sends to the computer.

Enables messages OK, CONNECT, RING,

NO CARRIER, and ERROR (terse result

codes 0–4).

Enables all messages except BUSY (terse

result codes 0–5, 10–14, 17–19, 28, and

32). If a call is placed to a busy line, NO

CARRIER displays.

Enables all messages (terse result codes 0–

5, 7, 10–14, 17–19, 28, and 32).

Disables printing Calling Line Identification

(CLI) at the end of the CONNECT message

line. This command does not affect X0, X1,

nor X2.

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Enables printing Calling Line Identification

(CLI) at the end of the CONNECT message

line. This command does not affect X0, X1,

nor X2.

Reset to Stored Profile

Values: none

Default: none

Resets TA to its current power-up profile and clears the command buffer.

The result is the same as turning the TA off and on. When you type ATZ,

the state of the &W command determines where default values originate.

&W0 defaults come from the customized configuration in NVRAM, and

&W1 defaults come from the factory default configuration in ROM.

Because Z clears the command buffer, it must be the last command in a

command string; normally it is issued by itself: ATZ. Note that whereas the

&F0 reset command always restores the factory default profile, the Z reset

command restores either the factory default or the stored profile, depending

on how the &W command is set.

&Cn DCD Control

Values: n = 0, 1, or 2

Default: &C1 (DCD normal)

Controls behavior of the DCD (Data Carrier Detect) signal. Normally, the

DCD goes high when the TA establishes a connection and drops when the

connection is lost. However, you can force DCD to remain high at all times

or to remain high except for a brief drop following a disconnect.

&C0

&C1

DCD is forced high at all times.

DCD goes from low to high when TA

establishes a connection (DCD normal).

&C2

DCD drops briefly following a disconnect,

then rises again. Register S10 defines how

long the DCD signal remains low after a

disconnect.

&Dn DTR Control

Values: n = 0, 1, 2, or 3

Default: &D1 (Exits Data Mode and reenters AT

command mode)

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Controls how the TA responds to the DTR (Data Terminal Ready) signal. A

high DTR signal tells the TA that the connected computer is ready to

communicate.

&D0

&D1

TA ignores the DTR signal.

If DTR lowers when the TA is online, TA

hangs up, returns to command mode, and

disables autoanswer. If the TA is offline, it

doesn’t answer or dial while DTR is low.

&D3

&D4

When DTR lowers, the TA resets the data

port and disables autoanswer. If DTR lowers

when the TA is online, the TA hangs up,

resets the active configuration to the stored

configuration, and disables autoanswer.

&D4 will ignore DTR only when answering

a data call. If DTR is low when an

incoming data call is present, the TA will

answer the call. If DTR goes high during

that call, nothing will happen. However, if

DTR goes high and then drops for the

minimum time specified by S25, then the

call will be disconnected just as it would

with &D1. &D4 is the same as &D1, except

that &D4 can answer a data call without

DTR and DTR can remain low for the

duration of the call. But if DTR goes high,

then &D4 will behave like &D1.

Note: If you want to accept calls while DTR is low, the TA must be config-

ured to ignore DTR. This is accomplished by entering AT&D0<cr>. With

this configuration, the TA is able to accept calls while DTR is low. If this

configuration setting is not made, the TA rejects incoming calls until DTR is

high while the calls comes in.

&En Flow Control

Values: n = 3–7, 12, 13

Default: &E4, &E6, &E13

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Selects method by which the TA controls the flow of data to and from the

computer, to prevent either device from accepting data faster than it can

handle. The TA provides flow control in both directions. When the TA halts

data flow, it is called flow control; when the computer halts data flow, it is

called pacing.

&E3

&E4

Disable flow control by the TA.

Hardware flow control. &E4 causes the TA

to use the CTS signal to regulate flow

control. When CTS goes low, data flow

from the computer is suspended until CTS

goes high again. This method works with

pacing, which uses the RTS signal on pin 4.

Hardware flow control cannot be enabled

unless an error correction protocol is

selected.

&E5

XON/XOFF flow control. This is an in-band

method, where the XON and XOFF

characters (^Q and ^S, respectively) are

inserted into the data stream, rather than

using separate control lines. When an XOFF

character is detected, the data stream is

suspended until an XON character is

detected. The drawback to this method is

that some files may contain these characters,

causing the file transfer to be suspended

indefinitely.

&E6

&E7

When XON/XOFF pacing is active, the TA

responds to and discards the XON/XOFF

characters from the computer.

When XON/XOFF pacing is active, the TA

responds to the XON/XOFF characters and

passes them through the communications

link to the remote device, thereby pacing the

remote terminal adapter as well.

&E12 Disables pacing

&E13 Enables pacing.

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#Xn Send Single/Multiple Xoff Characters

Values: n = 0 or 1

Default: #X0

Allows the TA to send either a single or multiple Xoff characters to exert

flow control to the terminal. The #X0 command (factory default setting)

causes one Xoff to be sent until the TA‘s buffer reaches the Xon level. The

#X1 command causes an Xoff to be sent for every character received after

the TA reaches its buffer full level.

#X0

One Xoff character sent until the buffer

reaches the Xon level (default)

#X1

Multiple Xoff characters sent for every

character received after buffer reaches the

full level.

&Fn Load Quick Setup Profile

Values: n = 0-4

Default: &F0

For quick setup, the TA includes Quick Setup Profiles. Each contains

configuration parameters for a specific type of port operation. To load a

Quick Setup Profile into active memory use the command &Fn, where n is

the number of the profile you want to load. You then can customize the

profile and store it with the &W command, so it loads automatically on

power-up or reset. These profiles are stored in permanent memory and are

not user-configurable.

&F0

Profile 0 — Modem-like async operation

(default)

&F1

&F2

&F3

&F4

Profile 1 — V.110 async operation

Profile 2 — V.120 async operation

Profile 3 — X.75 async operation

Profile 4 — PPP async operation

&Rn CTS Control

Values: n = 0, 1, or 2

Default: &R1 (CTS forced high)

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Allows you to control the state of the CTS (Clear to Send) signal. Normally

the CTS signal follows the state of the RTS signal when TA is online.

&R0

&R1

CTS acts normally; that is, it follows RTS.

CTS is forced high, but still provides online

flow control.

&R2

CTS is forced high, but it drops on

disconnect for the period of time set by S10.

CTS still provides flow control when the TA

is online.

&Sn DSR Control

Values: n = 0, 1, or 2

Default: &S1 (DSR normal)

Controls the state of the DSR (Data Set Ready) signal on the RS232E/V.24

interface. A high DSR signal indicates to the computer that the TA is ready

to transmit data.

&S0

&S1

DSR is always high.

DSR acts normally; that is, it follows the

state of the CD signal, which goes high

when the ISIHP-2S/2U detects a carrier

signal, and goes low when the carrier signal

is lost.

&S2

DSR is always high, except on disconnect,

when it drops for the period of time set by

S10 and then goes high again.

&Vn View Port Configuration Parameters

Values: n = 0, 1, 2

Default: n/a

Allows you to view the port configuration parameters for ports 0 and 1.

This listing is the equivalent of both L5 and L6 combined.

&V0

&V1

&V2

Displays port 0 configuration parameters.

Displays port 1 configuration parameters.

Displays both port 0 and port 1

configuration parameters.

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&Wn Store Active Profile

Values: n = 0 or 1

Default: &W1 (Use factory default profile)

Stores your active profile, or configuration, in memory, so you don’t lose

your custom settings when you turn off the TA or reset it.

&W0 Stores all current AT command and S-

memory (NVRAM) and configures the TA

so it reads your custom settings in NVRAM

when the modem is turned on or when it is

reset with the Z command. (The &F reset

command continues to read the factory

default settings in ROM.)

&W1 Erases your custom settings in NVRAM the

next time the TA is turned off or reset,

causing the TA to read the factory default

settings in ROM whenever it is turned on or

reset.

&Zn=x Store Telephone Number

Values: n = 0–9; x = dial string

Default: n/a

Allows you to store a telephone number in a memory register for faster

dialing. To store a number, type &Z, the register number (0–9) where you

want to store the number, the = character, and the dialing string you want

stored. Then press ENTER. The dialing string can have up to 80 characters.

To read a stored number, type AT&Zn? (e.g., AT&Z4?) where n is the

number of the register you want to read. To display a list of all numbers

stored in memory, type ATL and press RETURN:

14082345678

16125551212

14089876543

6313551

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4258513

16126313550

12138880123

DSn Dialing a Stored Telephone Number

Values: n = 0–9

Default: n/a

To dial a stored telephone number, type ATDSn in terminal mode, where n

is the location of the number you want to dial. For example, typing ATDS6

<cr> dials a telephone stored in memory register 6 location.

$Dn Persistent DTR Dialing

Values: n = 0, or 1

Default: $D0 (Disabled)

Enables or disables persistent DTR dialing (PDD). PDD causes the terminal

adapter to automatically and continually redial stored telephone number 0

when the port has no active calls and DTR is high.

$MBn

%En Escape Sequence Options

Values: n = 0–5

Default: %E1 and %E4

By default, the modem responds only to the +++ escape method. However,

you can use the %E command to set the modem to respond only to the

<break> method, to respond to either +++ or the <break> method, or to

ignore both methods and not escape.

%E0

%E1

%E2

%E3

%E4

%E5

Modem won’t escape

+++ escape method

<BREAK> escape method

Both +++ and <BREAK> escape methods

Disable OK response to +++

Enable OK response to +++

%E1 %E5 Enable +++ method and OK response

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to +++

%E3 %E5 Enable +++ or <BREAK> method and

OK response to +++

@P3=n Parity at Power-Up

Values: n = 0–4

Default: @P3=4 (None)

Use only to set the type of parity the TA uses when turned on. Once the TA

receives an AT command from the computer, it automatically adjusts to

parity the computer is using.

@P3=0 Odd

@P3=1 Even

@P3=2 Mark

@P3=3 Space

@P3=4 None

@P4=n Data Bits

Values: n = 7 or 8

Default: @P4=8 (8 data bits)

Use only to set the number of data bits the TA uses when turned on. Once

the TA receives an AT command from the computer, it automatically adjusts

to the number of data bits the computer is using.

@P4=7 7 data bits

@P4=8 8 data bits

@P6=n Stop Bits

Values: n = 1 or 2

Default: @P6=1 (1 stop bit)

Use only to set the number of stop bits the TA uses when turned on. Once

the TA receives an AT command from the computer, it automatically adjusts

to the number of stop bits the computer is using.

@P6=1 1 stop bit

@P6=2 2 stop bits

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Data Call Commands

Use these commands to make or configure data calls.

Answer Call

Values: none

Default: none

Forces TA to answer an incoming call. To cause the TA to autoanswer, set

Dn Dial

Values: string of up to 25 characters

Default: none

Causes TA to dial a telephone number (e.g., ATD785-3500 <cr>).

Hn Hang Up

Values: n = 0 or 1

Default: H0

Forces TA to go off-hook (take control of the telephone line) or go on-hook

(hang up). Since TA goes off-hook automatically when it dials, H command

normally is used only to hang up. To hang up, first escape to command

mode (+++AT <cr>), then type ATH (or ATH0) <cr>. Or, include the hang

up command in the escape sequence: +++ATH <cr>.

Go on-hook (hang up).

Go off-hook.

In Display Product Information

Values: n = 0, 1, and 2

Default: none

Displays the following TA product information:

Product ID (e.g., 247)

Firmware version number (e.g., 1.00)

Model number

Return Online

Values: none

Default: none

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Returns TA to online mode from the online command mode. When TA makes a

data connection, it enters online data mode. The TA typically remains in this

mode until it receives an escape sequence or until the call ends. When it

detects an escape sequence, the TA enters online command mode, where it can

accept AT commands while retaining the online connection. To return the TA

to online mode from the online command mode, enter the command ATO and

press ENTER.

@CONFIG Start ConfigMenu

Values: none

Default: none

Starts TA’s internal configuration utility, which allows you to customize the

configuration for your application. Enter the command while in terminal

mode.

Terminal Adapter S-Registers

S-registers are sections of memory in which values are stored that affect

how the TA operates. S-registers are so-called because each has a name that

begins with the character S. Use the S command to assign a value to or to

read the current value of an S-register. To assign a value to an S-register,

use the command Sr=n, in which r is the register number, and n is the value

you want to assign to the register, e.g., S7=45. To read an S-register value,

use the command Sr?, in which r is the register number, e.g., ATS7?.

S-Register Summary

S-Register

Function

Rings until answer

Ring count

Escape character

Carriage return character

Line feed character

Backspace character

Wait for connection (abort timer)

Pause Time for Comma

S10

S25

DCD Drop Time

DTR Drop Time

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S30

S32

S34

S50

S52

S54

S55

S56

S57

S75

S76

S77

S80

Online Inactivity

Escape sequence timeout

Maximum escape sequence length

Caller line ID (CLI)

Auto-protocol detection

Forces 56KBps B-Channel Data Rate

POTS Port Call Control

Calling Party Number IE Settings

Called Party Number IE Settings

Maximum V110 Network Rate

V110 Network Rate

V110 Network Rate Control

Persistent DTR Dialing Delay

S0 Number of Rings Until Answer

Unit: 1 ring

Range: 0–255

Default: 1

Sets the number of rings the TA waits for before it answers and begins its

connect sequence. S0=0 turns off the ability to automatically answer a call.

S0=1 causes the TA to automatically answer after 1 ring. Note that if the S0

value is set too high, the calling device may time out before the TA answers

the call. For autoanswer, S0 must have a nonzero value, DTR must be high

(&D command), and the TA must be offline.

S1 Ring Count

Unit: 1 ring

Range: 0–255

Default: 0

Counts the number of rings that have occurred, up to a maximum of 255. It

is a read-only register and is seldom, if ever, used in typical operation.

S2 Escape Character

Unit: Decimal ASCII code

Range: 0–127

Default: 43 (+)

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Specifies the character used by the TA to escape from data mode and return

to command mode.

S3 Carriage Return Character

Unit: Decimal ASCII code

Range: 0–127

Default: 13 (^M)

Specifies the character used by the TA to indicate the end of a command line.

S4 Line Feed Character

Unit: Decimal ASCII code

Range: 0–127

Default: 10 (^J)

Specifies the character used by the TA to indicate the end of a status

message.

S5 Backspace Character

Unit: Decimal ASCII code

Range: 0–32, 127

Default: 8 (^H)

Specifies the character used by the TA to delete the previous character in

command line.

S7 Wait for Connection (Abort Timer)

Unit: 1 second

Range: 0–255

Default: 45

Sets Abort Timer delay time, which is the length of time TA waits for a

connection after dialing. If no connection is established during the specified

time, the TA ends the call.

S8 Pause Time for Comma

Unit:

1 second

Range: n=0-255

Default: 2 (= 2 seconds)

S8 sets the length of the pause caused by a comma inserted in a dialing

command. The default setting is 2 seconds, where each unit is one second.

S8 may be set for up to 255 seconds.

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S10 DCD Drop Time

Unit: 50 ms

Range: 0–254, 255

Default: 20

Sets the amount of time the DCD signal will be dropped when a call is

disconnected if the DCD signal is configured for a momentary drop on

disconnect (&C2)

S25 DTR Drop Time

Unit: 100 ms

Range: 0, 1–255

Default: 5

Sets the time that DTR must remain low before the TA disconnects. The

S25 unit value for 0 is 40 ms. For values from 1 through 255, the unit value

is 100 ms.

S30 On-line Inactivity Timer

Unit:

1 minute

Range: n=0 Does not disconnect

n=1–255

Default: 0 (does not disconnect)

Makes the TA disconnect a data connection if no data is transmitted or

received for the specified time. It will NOT cause a POTS call (voice/

modem/fax) to disconnect. The timer restarts any time a data character

passes through the serial port (either sent or received). Disable the

inactivity timer by setting S30=0, which is the factory default setting. S30

currently works for + all protocols EXCEPT V.110.

S32 Escape Sequence Timeout

Unit: 100 ms

Range: 0–255

Default: 20

Sets the time allowed in an escape sequence from the receipt of the A in AT

to the receipt of the carriage return. If the S32 time interval expires before

you press ENTER, the escape sequence ends. The default time is 2 seconds.

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S34 Maximum Escape Sequence Length

Unit:

Decimal ASCII code

Range: 0–10

Default: 2

Sets the maximum character length of the escape sequence, not including

+++AT. For example, a character length of S34=2 allows two characters

after +++AT (e.g., +++ATH0). Conversely, an invalid escape sequence

(too many characters placed in the command string) passes through as data

(e.g., +++atili2). The maximum length of the escape sequence is 10

characters.

S50 Caller Line ID CLI

Unit: Decimal ASCII code

Range: 0 or 1

Default: 0 (disable CLI)

Sets whether the mechanism for identifying the two endpoints of a

connection is enabled or disabled. Since RING messages only appear for

ISDN data calls, the CLI feature does not define a means of conveying

Calling Party information to the terminal for ISDN voice calls. The CLI

information is only included with the first RING message for a given

incoming call, and appears as follows:

RING

FM: 5552000 TO: 5551000

If the Calling Party Number information is not included in the incoming

SETUP message, the RING message appears as follows:

RING

TO: 5551000

If the Called Party Number information is not included in the incoming

SETUP message, the RING message will appear as follows:

RING

FM: 5552000

If neither the Called Party Number nor the Calling Party Number is

included in the incoming SETUP message, the RING message will contain

no additional information.

S52 Auto-Protocol Detection

Usage: S52=n; S52?

Function: Auto-Protocol Detection

Unit:

Decimal ASCII code

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Range: n=0—Disable,

n=1—Detect,

n=2—Detect and Select

Default: 1 (Detect)

Enables or disables the ability to identify the reception of V.110, V.120,

X.75, or PPP data calls. The TA determines the type of call by checking for

protocol information in the SETUP message or by matching protocol

information received on the B-channel once connected if no protocol

information is available in the SETUP message. Once the protocol is

determined, the TA will switch its data protocol to match. Upon disconnect

the TA will revert its data protocol selection back to the protocol that was

selected before the call was received when S52=1 “Detect”. If S52=2

“Detect and Select”, then the TA will not revert the protocol selection,

rather it will keep the detected data protocol as the new protocol selection.

“Detect and Select” is useful for applications where the TA receives a call

and then the software performs callback. Callback calls should be made

with the same protocol that was used by the client so “Detect and Select”

enables this possibility. However, if an initialization string or &Fn

command is given to the TA that changes the protocol after the

disconnection, then “Detect and Select” will not be effective. Make sure no

commands are given to the TA that will change the data protocol when using

“Detect and Select” if callback is involved to ensure that the callback call

uses the correct data protocol.

S54 Force 56 Kbps B-Channel Data Rate

Unit:

Decimal ASCII code

Range: n=56 (Kbps) or 64 (Kbps)

Default: 64 (Kbps)

S54 can be used to force a 56 Kbps B-channel data rate in order to make 56

Kbps data calls.

S55 POTS Port Call Control

Unit:

Decimal ASCII code

Range: 1, 2, 17, 18

Default: 1

Allows you to set the type of information transfer capability for calls placed

from the POTS port either by a telephone, modem, or fax. Some Central

Office (CO) switches keep track of the type of line each customer has, and

if that line is labeled as a data line (modem or fax), it will not accept a

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speech call originated on that line. However, 3.1 kHz audio information

transfer capability is allowed on data lines (modem or fax) by most

switches. S55 also lets you define whether a progress indicator information

element (which indicates that the origination address of the POTS call is

non-ISDN) is sent with the SETUP message for the POTS port call. This

may help POTS port calls get through certain CO switches.

Speech, no progress indicator

S17

S18

3.1 kHz Audio, no progress indicator

Speech, origination address is non-ISDN

3.1 kHz Audio, origination address is non-ISDN

S56 Calling Party Number IE Settings

(applies to NET3 [!C0=2] switch type only)

decimal ASCII code

Disable

Unit:

Range: 128

Type of Number

Unknown,

International

National

Network specific

Subscriber

Abbreviated

Numbering Plan

Unknown

ISDN/telephony

Data

Telex

National standard

Private

Default: 128 (disabled)

Modifies the value of Octet 3 of the Calling Party Number Information

Element that is sent within the SETUP message for data and POTS port

(voice/modem/fax) calls. To set a specific number type and numbering

plan, select an option from the Type of Number section above and add its

value to the value of an option in the Numbering Plan section above. For

example, a National/ISDN Calling Party Number IE would be S56=33,

where 32 (National) + 1 (ISDN/telephony) = 33 (National/ISDN). If there

is no Data Directory Number (for data calls) nor Voice Directory Number

(for voice/modem/fax calls), no Calling Party Number IE is sent. By

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default S56=128, which means no Calling Party Number IE is sent.

S57 Called Party Number IE Settings

(applies to NET3 [!C0=2] switch type only)

Unit:

Range: 128

Type of Number

decimal ASCII code

Disable

Unknown,

International

National

Network specific

Subscriber

Abbreviated

Numbering Plan

Unknown

ISDN/telephony

Data

Telex

National standard

Private

Default: 128 (disabled)

Modifies the value of Octet 3 of the Called Party Number Information

Element that is sent within the SETUP message for a data call and within

each INFORMATION message that is sent when dialing from the POTS

port. To set a specific number type and numbering plan, select an option

from the Type of Number section above and add its value to the value of an

option in the Numbering Plan section above. For example, a National/

ISDN Called Party Number IE would be S57=33, where 32 (National) + 1

(ISDN/telephony) = 33 (National/ISDN). By default S57=128, which means

no Called Party Number IE is sent.

S75

Maximum V.110 Buffer Size

Unit: 1 byte

Range: n=0 (256 bytes),

n=64-255

Default: 0 (256 bytes)

S75 allows the maximum V.110 buffer size to be customized. An adjustable

packet size can provide higher compatibility with devices that cannot handle

a large delay. Reducing the V.110 buffer size reduces delay.

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S76 V.110 Network Rate

Unit:

decimal

Range: n=1—-—600 bps,

n=2——1200 bps,

n=3——2400 bps,

n=4——4800 bps,

n=5——9600 bps,

n=6—19200 bps,

Default: 6 (19200 bps)

If S77=1, then the network rate of the V.110 connection will match that of

S76 ($MB). If a V.110 call is received and S77=1, then the incoming V.110

network rate must match S76 ($MB) or the connection will fail. If S77=2

and a V.110 call is received, then the setting of S76 ($MB) will have no

effect on the network rate of that call (see S77 for a description for this

case). The value of S76 will change if $MB is changed and the value of

$MB will change if S76 is changed.

S77 V.110 Network Rate Control

Unit:

Range: n=1 (use $MB (S76)),

n=2 (use $MB (S76)) or Auto Sync on Answer)

decimal

Default: 2 (use $MB(S76) or Auto Sync on Answer)

The Network Rate for an originated V.110 call will be determined by S76

($MB) for both S77=1 and S77=2. If the Network Rate of the originated

call does not match that of the peer device, then the connection will fail if

the peer does not support automatic rate synchronization. If the terminal

adapter answers a V.110 call, and if S77=1, then the incoming V.110

Network Rate must match that of the S76 register ($MB) or else the

connection will fail. If S77=2, then the terminal adapter will auto-

synchronize on the incoming V.110 Network Rate.

S80 Persistent DTR Dialing Delay

Usage:

Unit:

S80=n; S80?

1 second

Range:

n=1-255 (1-255 seconds)

Default: 5 ( = 5 seconds)

Once DTR is detected as present (active high) and other conditions

required for the TA to dial are met, a delay of S80 seconds will occur before

stored number 0 is dialed. Some conditions include the TA not being in the

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@CONFIG menu, not having a data call present at the time, and Persistent

DTR Dialing must be enabled. By default the TA will delay for 5 seconds

before dialing when all conditions are satisfied.

Terminal Adapter Result Codes

When the TA receives an AT command from the computer or terminal, it

attempts to execute the command, then sends a status message to the

computer or terminal that reports the result of the command. The TA

provides you with several of these response messages, or result codes,

which can be displayed on your monitor or intercepted and used by your

communications software. Using the V command, you can select whether

the result codes are terse (numbers) or verbose (words).

The TA’s result codes are listed in the following table. Note that the speed

of an ISDN channel is always either 56 Kbps or 64 Kbps. CONNECT

messages indicate the speed of the connection between the TA and your

computer or terminal.

Terse

Verbose

CONNECT

1PC

1VC

CONNECT/PPP

CONNECT/PPP COMPRESSED

CONNECT/V.110

CONNECT/V.120

CONNECT/V.120 COMPRESSED

RING

NO CARRIER

ERROR

CONNECT 1200/V.110

NO DIALTONE

BUSY

10T

CONNECT 600/V.110

CONNECT 2400/V.110

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11T

12T

14T

28T

CONNECT 4800/V.110

CONNECT 9600/V.110

CONNECT 19200/V.110

CONNECT 38400/V.110

CONNECT 56000

56P

CONNECT 56000/PPP

56PC

56V

56VC

56X

56XC

CONNECT 56000/PPP COMPRESSED

CONNECT 56000/V.120

CONNECT 56000/V.120 COMPRESSED

CONNECT 56000/X.75

CONNECT 56000/X.75 COMPRESSED

CONNECT 64000

64P

CONNECT 64000/PPP

64PC

64V

64VC

64X

64XC

CONNECT 64000/PPP COMPRESSED

CONNECT 64000/V.120

CONNECT 64000/V.120 COMPRESSED

CONNECT 64000/X.75

CONNECT 64000/X.75 COMPRESSED

CONNECT MODEM

Using AT Commands to Operate the Terminal

Adapter

You can configure and operate the Terminal Adapter entirely with AT

commands, if you want. Remember, you can issue AT commands only from

a terminal or from a computer running a communications program in

terminal mode. This section describes how to use AT commands for basic

operations such as calling, answering a call, and hanging up.

Modes of Operation

The TA has three modes of operation: offline command, online command,

and data.

Offline Command Mode

In offline command mode, the TA communicates with the terminal or

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computer and responds to AT commands. There is no data communications

link with a remote device.

Data Mode

The TA enters data mode when it makes a successful data communications

link with a remote device. In data mode, the TA can send and receive data,

but it does not respond to AT commands. Instead, it treats them as data, and

transmits them to the remote device.

Online Command Mode

In online command mode, the TA responds to AT commands while

maintaining a data communications link; however, transmission of data is

suspended. To enter online command mode from data mode, type the escape

sequence +++AT<cr>. To return to data mode from online command mode,

type ATO<cr>.

Making a Call

Before you can place a data call, you must configure the TA for the local

switch type, serial port speed, and the data type of the ISDN device you

want to call.

Dialing

To dial a number using AT commands, you must first start a data

communications program. In the program’s terminal mode, type

ATDxxxxxxx<cr>, where xxxxxxx is the telephone number you want to

dial, and <cr> is the carriage return character that is sent when you press

ENTER , e.g, ATD7853500<cr>. The dial string can contain up to 80

characters.

To make it easier to read the dial string, you can use hyphens, spaces or

parentheses. These characters are ignored by the TA. For example, the TA

would read the following dial strings the same way:

ATD16127853500 <cr>

ATD 1-612-785-3500 <cr>

ATD 1 (612) 785-3500 <cr>

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Terminal Adapter AT Commands & S-Registers

Canceling a Call

To cancel a call before the TA makes a connection, press any key.

Storing a Telephone Number

To store a telephone number, type &Zn=x in terminal mode, where n is the

number of the memory register in which the number is to be stored, andx is the

dial command string that you want to store. For example, type AT&Z9=612-

785-3500 <cr> to store the number 612-785-3500 in memory register 9.

Dialing a Stored Telephone Number

To dial a stored telephone number, type DS=n in terminal mode, where n is

the location of the number you want to dial. For example, type ATDS=3

<cr> dials a telephone stored in memory register 3 location.

Displaying a Stored Number

To display a stored telephone number, type &Zn? in terminal mode, where

n is the memory register where the number is stored. For example, type

AT&Z5? <cr> to display the telephone number in memory register 5. To

list all ten telephone numbers stored in memory, type ATL <cr>.

Answering a Call

You can answer incoming calls to the TA either manually or automatically.

When the TA detects an incoming call, it turns on the RI signal on the V.24

interface and sends a RING result code to the computer or terminal after

each ring. If you enable autoanswer, the TA automatically answers the call.

To manually answer the call, use the A command.

Answering Manually

If your communication program is in terminal mode when the RING result

code appears on your monitor, manually answer the call by typing ATA

<cr>.

Answering Automatically

To set the TA to answer a call automatically :

1. Enable autoanswer by setting register S0 to the ring on which you

want the TA to answer (e.g., in terminal mode, type S0=4 to make

the TA answer on the fourth ring). You also can use one of the

configuration utilities to the turn autoanswer on and set the number

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of rings.

2. Make sure that the TA is offline.

The TA answers the call after the number of rings specified by S0. To

disable autoanswer, use a configuration utility or the command S0=0.

Note: If the user wants to accept calls while DTR is low, the TA must be

configured to ignore DTR. To ignore, enter AT&D0<cr>. With this configu-

ration, the TA can accept calls while DTR is low. If this configuration

setting is not made, the TA rejects incoming calls until DTR is high while

the calls comes in.

Answering Using Call Steering

Call Steering lets you set up the Data DN/MSN numbers and/or Modem

DN/MSN numbers so that calls to specific numbers will be “steered” to the

respective Data or Modem port. If a DN/MSN is left blank, then the TA

assumes the port can accept a call to any number. A port that is given a

specific DN/MSN has priority over a port that has a blank DN/MSN. If a

port with a specific DN/MSN is busy, then the call will be “steered” to

another available port if that port’s DN/MSN matches or is blank.

Otherwise if a port is busy and there is no other available port or no other

port that matches the called number, then the TA will report a busy. Data

DN/MSN 1 will “steer” calls to the first Data (TA) port. Data DN/MSN 2

will “steer” calls to the second Data (TA) port. Modem DN/MSN 1 will

“steer” calls to the first Modem port. Modem DN/MSN 2 will “steer” calls

to the second Modem port. Call Steering is useful for applications where

specific ports are tied to specific types of applications or equipment. For

example, fax software attached to the second modem port should only

receive fax calls (and not dial-up calls). To do this one would set Modem

DN/MSN 2 to the desired number that will only receive fax calls. If

Modem DN/MSN 1 is left blank and the second port is busy, then fax calls

will be “steered” to port 1. If this is not desired, then set Modem DN/MSN

1 to a number other than that of the number used for faxes.

Hanging Up

To hang up a call, first escape to online command mode (+++AT<cr>), then

enter the H command (ATH<cr>). The escape sequence and hang up

command can be combined into one command string: +++ATH<cr>.

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Troubleshooting

This chapter covers common problems you may have with your ISIHP and

how to solve them. The ISIHP was thoroughly tested at the factory before

shipping. If you are unable to connect successfully, or if you experience

data loss or garbled characters, during connecting, it is possible the modem

or terminal adapter is defective. However, it is more likely that the source of

your problem lies elsewhere. Always make sure all hardware is connected

properly. Then review the common problems listed in this chapter for

recommendations on what to change or do. Problems you may encounter

include the following:

• The TA/modem does not respond to commands.

• The TA/modem dials but cannot make a connection.

• You can place data calls but not voice calls, or vice versa.

• You cannot place two simultaneous data calls.

• The TA/modem disconnects while online.

• The TA/modem cannot connect when answering.

• File transfer appears slower than it should be.

• Data is being lost

• There are garbage characters on the monitor

If you experience problems, please check the following possibilities before

calling Tech Support (see Chapter 6).

The terminal adapter does not respond to commands

• Make sure you issue commands from the data communications

software, either automatically or manually, in terminal mode. (You

cannot send commands to the TA/modem from the DOS prompt.)

• Make sure you are in terminal mode in your data communications

program; then type AT and press ENTER. If you get an OK response,

your connections are good and the problem likely is in your

phonebook entry or session settings.

• If you don’t get an OK, the problem may still be in the

communications software. Make sure you have done whatever is

necessary in your software to make a port connection. Not all

communications programs connect to the COM port automatically.

Some connect when the software loads and remain connected until

the program ends. Others, like MultiExpress Terminal, can

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Troubleshooting

disconnect without ending the program (make sure the Connect icon

looks plugged in). MultiExpress Terminal also allows multiple

terminals to be open, but only one can access the modem/TA at a

time.

• Your communications software settings may not match the physical

port where the TA is connected. The serial cable may be plugged into

the wrong connector—check your computer documentation to make

sure. Or, you may have selected a COM port in your software other

than the one where the TA/modem is connected—compare the

settings in your software to the connection.

• Peripheral expansion cards, such as bus mouse and sound cards, may

include a serial port preconfigured as COM1 or COM2. The extra

serial port, or the card itself, may use the same COM port, memory

address, or interrupt request (IRQ) as your communications port. Be

sure to disable any unused ports.

To look for address or IRQ conflicts if you use Windows 3.1x, select

File then Run in Program Manager. Type MSD and press ENTER.

Then select Mouse, COM Ports, and IRQ Status and note the

addresses and IRQs that are in use. If you find an IRQ conflict, note

which IRQs are not being used, then change one of the conflicting

devices to use one of the unused IRQs. If you find an address

conflict, change the address of one of the conflicting devices.

To change a port address or IRQ in Windows 3.1x, double-click the

Control Panel icon and then the Ports icon. Click the port you want

to change; then click Settings and then Advanced and select the new

port address and/or interrupt. If you want to use COM3 or COM4,

note that COM3 shares an IRQ with COM1, as does COM4 with

COM2, so you should change their IRQs to unused ones if possible.

If you use Windows 95, right-click My Computer and select

Properties. Click the Device Manager tab and then double-click

Ports. Double-click the Communications Port where your modem/

TA is connected. In the port’s Properties sheet, click the Resources

tab to view the port’s Input/Output range and Interrupt Request. If

another device is using the same address range or IRQ, it appears in

the Conflicting Device List. Remove the check from Use Automatic

Settings to change the port’s settings, so they do not conflict with the

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Troubleshooting

other device. Or, select the port the conflicting device is on and

change it instead. If you need to open your computer to change

switches or jumpers on the conflicting device, refer to the your

computer’s documentation.

• The serial port may be defective. If you have another serial port,

install the TA on it, change the COM port setting in your software,

and try again.

• The TA may be defective. Call Tech Support for assistance (see

Chapter 6).

The terminal adapter dials but cannot make a connection

Possible be several reasons the TA fails to make a connection include:

• Lack of a proper physical connection to the communication line

• A busy signal

• A wrong number

• No terminal adapter at the other end

• A faulty communications device, computer, or software at the other

end

• Incompatibility between communications devices

• An improperly configured ISIHP-2S/2U/4S/4U TA

Narrow the list of possibilities by using extended result codes. To enable

them, enter ATV1X2 and press ENTER while in terminal mode or include

V1X2 in the TA ’s initialization string (V1X2 is enabled by default). When

you dial again, the TA reports the call’s progress.

• If the modem/TA reports BUSY, the other number may be busy. Try

again later.

• If the TA reports NO CARRIER, no connection was made. You may

have dialed the correct number, but the other computer or software

was turned off or faulty. Check the number and try again or try

calling another system to make sure your TA is working. Also, check

that you accurately configured the TA with the correct switch type,

TEIs, data protocols, and other parameters needed for a successful

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Troubleshooting

call (see Chapter 3).

You can place data calls but not voice calls, or vice versa

• You might not have ordered both voice and data service from your

ISDN provider. Check your contract or latest statement of service

from your ISDN provider.

• Your ISDN provider may have programmed the switch incorrectly.

Call the provider.

You cannot place two simultaneous data calls

• You may not have ordered an ISDN line configuration that supports

two simultaneous calls. Check your contract or latest statement of

service from your ISDN provider. Also, your ISDN provider may

have programmed the switch incorrectly. Call the provider.

• You may have misconfigured your TA to dial two simultaneous data

calls. The command AT&J1&W0<cr> is used to indicate whether

outgoing calls should be made on two B-channels by default.

• You may be using the wrong bundling dial modifier (e.g.,

ATD7853500&7853502<cr>). The ampersand in this command

string is correct. Note other valid characters joining two telephone

numbers include a Plus Sign (+) and an exclamation Mark (!).

Note: In Windows 95, if the Use Country Code and Area Code box is

checked in the Properties window for dial-up connection, the bundling

modifier (i.e., &, + or !) is removed from the dialing string when the user

attempts to make a connection. The solution is to not check the Use

Country Code and Area Code box or to simply add the bundling dial

modifier to the phone number at the time of connection.

The terminal adapter disconnects while online

• Check for loose connections between the computer, the ISDN jack,

and AC power.

• The problem may have originated at the other end of the line. Try

again.

• If you were online with a BBS or online service, it may have hung up

due to lack of activity on your part or because you exceeded your

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Troubleshooting

time limit for the day. Try again.

The terminal adapter cannot connect when answering

• Autoanswer may be disabled. Turn on autoanswer in your data

communications program, or send the command ATS0=1 to your TA

in terminal mode.

Note: To accept calls while DTR is low, configure the TA to ignore DTR by

entering AT&D0<cr>. Configured this way, the TA accepts calls while DTR

is low. Otherwise the TA rejects incoming calls until DTR is high while the

calls come in.

File transfer appears slower than it should

• If you have a Universal Asynchronous Receiver/Transmitter (UART)

that is compromising data throughputs, we recommend you replace it

with a special I/O card.

• If you are running under Windows 3.1 and have a 16550AFN UART,

you must replace the Windows serial driver, COMM.DRV, to take

full advantage of the UART’s speed.

• Check the serial port baud rate in your communications software and

make sure it is set as high as your UART allows.

Data is being lost

• Your UART may not be reliable at serial port speeds over 9600 bps

or 19,200 bps. Reset your serial port speed to a lower rate or replace

your serial port with a faster one.

• Check the serial port baud rate in your communications software, and

make sure it is set as high as your UART allows.

• Make sure the flow control method you selected in software matches

the method selected in the TA.

There are garbage characters on the monitor

• Your computer and the remote computer may be set to different

parities. Check with the remote system with which you are

communicating and set your communications software to use the

same parity as the remote system. communicating and set your

communications software to use the same parity as the remote

communicating and set your communications software to use the

same parity as the remote system.

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Regulatory Information

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Regulatory Information

Regulatory Agency Information

FCC Part 68 Telecom

1. This equipment complies with part 68 of the Federal

Communications Commission Rules. On the outside surface of this

equipment is a label that contains, among other information, the

FCC registration number. This information must be provided to the

telephone company.

2. As indicated below, the suitable jack (Universal Service Order

Code connecting arrangement) for this equipment is shown. If

applicable, the facility interface codes (FIC) and service order

codes (SOC) are shown.

3. An FCC compliant telephone cord and modular plug is provided

with this equipment. This equipment is designed to be connected to

the telephone network or premises wiring using a compatible

modular jack that is Part 68 compliant. See installation instructions

for details.

4. If this equipment causes harm to the telephone network, the

telephone company will notify you in advance that temporary

discontinuanace of service may be required. If advance notice is

not practical, the telelphone company will notify the customer as

soon as possible.

5. The telephone company may make changes in its facilities,

equipment, operation, or procedures that could affect the operation

of the equipment. If this happens, the telephone company will

provide advance notice to allow you to make necessary

modifications to maintain uninterrupted service.

6. If trouble is experienced with this equipment (the model of which is

indicated below), please contact Multi-Tech Systems, Inc. at the

address shown below for details of how to have repairs made. If the

equipment is causing harm to the network, the telephone company

may request you to remove the equipment form t network until the

problem is resolved.

7. No repairs are to be made by you. Repairs are to be made only by

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Multi-Tech Systems or its licensees. Unauthorized repairs void

registration and warranty.

Manufacturer:

Multi-Tech Systems,

Inc.

Trade name: MultiModemISI Hybrid

Model number:

ISIHI-2U

FCC registration number:

DD-E

AU7USA-25932-

Facility interface code:

Modular jack (USOC):

middle pins for T-R)

Service center in USA:

Inc.

02IS5

RJ-49C (8-pin with

Multi-Tech Systems,

2205 Woodale Drive

Mounds View, MN 55112

(612) 785-3500 Fax (612) 785-9874

Federal Communications Commission Statement

This equipment has been tested and found to comply with the limits for a

Class A digital device, pursuant to Part 15 of the FCC rules. These limits are

designed to provide reasonable protection against harmful interference

when the equipment is operated in a commercial environment. This

equipment generates, uses, and can radiate radio frequency energy, and if

not installed and used in accordance with the instruction manual, may cause

harmful interference to radio communications. Operation of this equipment

in a residential area is likely to cause harmful interference, in which case the

user will be required to correct the interference at his own expense.

This device complies with Part 15 of the FCC rules. Operation is subject to

the following two conditions:

• This device may not cause harmful interference.

• This device must accept any interference that may cause undesired

operation.

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Regulatory Information

Warning: Changes or modifications to this unit not expressly approved by

the party responsible for compliance could void the user’s authority to

operate the equipment.

Industry Canada

This Class A digital apparatus meets all requirement so the Canadian

Interference-Causing Equipment Regulations.

Cet appareil numerique de la classe A respecte toutes les exigences du

Reglement sur le materiel brouilleur du Canada.

FCC Fax Warning

The Telephone Consumer Protection Act of 1991 makes it unlawful for any

person to use a computer or other electronic device, including fax machines,

to send any message unless such message clearly contains the following

information:

• Date and time the message is sent

• Identification of the business or other entity, or other individual

sending the message

• Telephone number of the sending machine or such business, other

entity, or individual

This information is to appear in a margin at the top or bottom of each

transmitted page or on the first page of the transmission. (Adding this

information in the margin is referred to as fax branding.)

Since any number of fax software packages can be used with this product,

users must refer to the their fax software manual for setup details. Typically,

the fax branding information must be entered via the configuration menu of

the software.

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Canadian Limitations Notice

Notice: The ringer equivalence number (REN) assigned to each terminal

device provides an indication of the maximum number of terminals allowed

to be connected to a telephone interface. The termination on an interface

may consist of any combination of devices subject only to the requirement

that the sum of the ringer equivalence numbers of all the devices does not

exceed five.

Notice: The Industry Canada label identifies certificated equipment. This

certification means that the equipment meets certain telecommunications

network protective, operational and safety requirements. The Department

does not guarantee the equipment will operate to the user’s satisfaction.

Before installing this equipment, users should ensure that it is permissible to

be connected to the facilities of the local telecommunications company. The

equipment must also be installed using an acceptable method of connection.

The customer should be aware that compliance with the above conditions

may not prevent degradation of service in some situations.

Repairs to certified equipment should be made by an authorized Canadian

maintenance facility designated by the supplier. Any repairs or alterations

made by the user to this equipment, or equipment malfunctions, may give

the telecommunications company cause to request the user to disconnect the

equipment.

Users should ensure for their own protection that the electrical ground

connections of the power utility, telephone lines and internal metallic water

pipe system, if present, are connected together. This precaution may be

particularly important in rural areas.

Caution: Users should not attempt to make such connections themselves,

but should contact the appropriate electric inspection authority, or electri-

cian, as appropriate.

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Regulatory Information

EMC, Safety, and Terminal Directive Compliance

The CE mark is affixed to this product to confirm compliance with the

following European Community Directives:

Council Directive 89/336/EEC of 3 May 1989 on the approximation of the

laws of Member States relating to electromagnetic compatibility,

and

Council Directive 73/23/EEC of 19 February 1973 on the harmonization of

the laws of Member States relating to electrical equipment designed for use

within certain voltage limits,

and

Council Directive 98/13/EC of 12 March 1998 on the approximation of the

laws of Member States concerning telecommunications terminal and

Satellite earth station equipment.

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Index

hardware 13

Index

modems to COM ports

in Windows 95/98 40

in Windows NT 24

software/drivers

AT commands 73

in SCO Open Server 5 62

Linux 68

NetWare Connect 61

terminal adapters to COM ports

in Windows 95/98 40

in Windows NT 24

installing

software/driver

in Windows 95/98 34

in Windows 98 36

in Windows NT 20

IRQ Codes 32

ISDN Configuration Utility 52, 58

ISDN line 5

Basic Rate Interface (BRI) 4

ConfigMenu 58

Call Control Configuration Menu 59

Data Protocol Menu 59

Help Menu 59

menus 59

Network Configuration Menu 59

Port Control Configuration Menu 59

Stored Numbers Menu 59

configuration

AT commands 60, 74

ConfigMenu 58, 59

ISDN Configuration Utility 52, 58

ports

in Netware Connect 61

communication protocols 9

connecting

LED indicators 16

mounting bracket 16

MultiModemISI Hybrid Series

introduction 4

to ISDN wall jack 15

Contents, package 12

naming ports in SCO 64

Netware Connect (Novell) 61

hardware

computer requirements 12

installation 13

hardware installation

introduction 12

package contents 12

port assignments 7

protocols 9

I/O address 32

installation

activating ports

Remote Access Server (RAS) 4

removing

software/driver

in SCO Open Server 5 65

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NetWare Connect (Novell) 61

software/drivers

in SCO Open Server 5 67

removing driver

in Windows NT 33

removing software/driver

in Windows 95 36

in Windows 98 39

in Windows NT 33

S/T interface 15

safety warnings 12

SCO Open Server 5 62

service 71

shipping contents 12

software/driver installation

in Windows 95 34

in Windows 98 36

in Windows NT 20

terminal adapter

configuring 49, 52

upgrades 71

warranty 72

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