QS-100D
Four Channel RS-232 Asynchronous
Communications Adapter
for ISA compatible machines
INTERFACE CARDS FOR IBM PC/AT AND PS/2
User's Manual
QUATECH, INC.
5675 Hudson Industrial Parkway
Hudson, Ohio 44236
TEL: (330) 655-9000
FAX: (330) 655-9010
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Warranty Information
Quatech Inc. warrants the
QS-100D
to be free of defects for
one (1) year from the date of purchase. Quatech Inc. will repair or replace any adapter that fails to
perform under normal operating conditions and in accordance with the procedures outlined in this document
during the warranty period. Any damage that results from improper installation, operation, or general misuse
voids all warranty rights.
The authors have taken due care in the preparation of this document and any associated software
program(s). In no event will Quatech Inc. be liable for damages of any kind, incidental or consequential, in
regard to or arising out of the performance or form of the materials presented herein and in the program(s)
accompanying this document. No representation is made regarding the suitability of this product for any
particular purpose.
Quatech Inc. reserves the right to edit or append to this document or the product(s) to which it
refers at any time and without notice.
Please complete the following information and retain for your records. Have this information available when
requesting warranty service.
Date of purchase:
Model Number:
QS-100D
Product Description:
Four Channel Asynchronous RS-232
Adapter
Communications ISA
Serial Number:
QS-100D User's Manual
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© 1993, Quatech, Inc.
NOTICE
The information contained in this document cannot be reproduced in any
form without the written consent of Quatech, Inc. Likewise, any software
programs that might accompany this document can be used only in accordance
with any license agreement(s) between the purchaser andQuatech, Inc. Quatech,
Inc. reserves the right to change this documentation or the product to which it
refers at any time and without notice.
The authors have taken due care in the preparation of this document and
every attempt has been made to ensure its accuracy and completeness. In no event
will Quatech, Inc. be liable for damages of any kind, incidental or consequential,
in regard to or arising out of the performance or form of the materials presented in
this document or any software programs that might accompany this document.
Quatech, Inc. encourages feedback about this document. Please send any
written comments to the Technical Support department at the address listed on the
cover page of this document.
IBM PCTM, PC-ATTM, PS/2™, and Micro Channel™ are trademarks of International Business
Machines Corporation.
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Declaration of Conformity
Manufacturer's Name:
Quatech Inc.
Manufacturer's Address:
5675 Hudson Industrial Parkway
Hudson, Ohio 44236 (USA)
Application of Council Directive:
89/336/EEC
Standards to which
Conformity is Declared:
* EN50081-1
(EN55022, EN60555-2, EN60555-3)
* EN50082-1
(IEC 801-2, IEC 801-3, & IEC 801-4)
Type of Equipment:
Equipment Class:
Information Technology Equipment
Commercial, Residential, & Light
Industrial
Product Name:
Model Number :
ISA Communications Card
QS-100D/S/750/IND
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Table of Contents
1. General Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1 Explanation of Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2. Hardware Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1 Setting the Base Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2 Setting the Interrupt Level (IRQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.3 Configuring Interrupt Sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.4 Interrupt Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
3. Windows 95 Configuration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1 Using the Add New Hardware
Wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 Viewing and Changing
Resources with Device Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
4. External Connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
5. Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
6. Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
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1. General Information
The Quatech, Inc. QS-100D provides four RS-232 asynchronous serial
communication interfaces for IBM-compatible personal computer systems using
the 16-bit ISA (Industry Standard Architecture) expansion bus.
The QS-100D is highly flexible with respect to addressing and interrupt level use.
The serial ports are addressed in a contiguous block that can be placed anywhere
within the range of 0000 hex to FFFF hex, and available interrupt levels include
IRQ2 to IRQ7, IRQ10 to IRQ12, IRQ14, or IRQ15. (Early versions of the
QS-100D are limited to IRQ2-7.)
All four ports on the QS-100D can share one interrupt level. A special interrupt
status register is provided to allow controlling software to manage the shared
interrupt level. The shared interrupt feature minimizes the system resources
consumed by the adapter.
In order to support the use of the shared interrupt feature of the QS-100D,
Quatech has developed device drivers for several popular operating systems and
environments. The sales department can be contacted for details on current
offerings.
Note: References to the QS-100D throughout this manual apply to the following
products.
PRODUCT
QS-100DS
QS-100IND
QS-100D750
QS-100IND750
IND PACKAGE
UART UPGRADE
no
yes
no
no
no
yes
yes
yes
Figure 1 --- QS-100D Product Series Summary
1.1 Explanation of Packages
The base four port RS-232 asynchronous communications adapter is the
QS-100DS. This product inplements each of its four communication channels
with a 16550 UART. Signal Transmission and Reception is accomplished using
standard line driver and receiver components.
For improved performance and reliability, Quatech offers the following board
upgrades:
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1.1.1 IND Package
The IND upgrade on the QS-100IND and QS-100IND750 boards provides the
protection essential for reliable use in an industrial environment. Special line
drivers and receivers are used which have 15kV ESD (Electro Static Discharge)
protection, and each communication line has a surge suppressor capable of
sustaining up to 40A transient surges (at 14V).
1.1.2 UART Upgrade
The UART upgrade on the QS-100D750 and QS-100IND750 boards provides a
16750 UART in place of the 16550 UART found on the standard QS-100D. The
UART (Universal Asynchronous Transmiter and Receiver) takes byte size data
from the bus side of board and breaks it into the bit size data required for serial
communication. Benefits of the 16750 UART include extended 64 byte FIFOs on
transmit and receive and the ability to sustain transfer rates as high as 1Mbaud (
acheiving this rate is dependent upon the user’s system and the board’s oscillator
frequency). The increased FIFO size allows the 16750 UART to store larger
amounts data; which means that each read or write access to the UART can move
more data per operation, resulting in less processor time being spent servicing the
UART.
The Quatech serial device driver for Windows 95, which is included with the
QS-100D, provides support for the UART’s 16750 mode. Other applications
and/or operating systems may not support a UART operating in 16750 mode, in
which case the default operation will be 16550 compatible mode.
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Figure 2 --- Diagram of QS-100D
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2. Hardware Installation
If the default address and interrupt settings are sufficient, the QS-100D can be
quickly installed and put to use. The factory defaults are listed in Figure 3.
PORT
Serial 1
Serial 2
Serial 3
Serial 4
ADDRESS
300 hex
308 hex
310 hex
318 hex
IRQ
3
3
3
3
Figure 3 --- Default address and IRQ settings for QS-100D
The output of the QS-100D is a 37-pin D-connector labeled CN1. A cable is
provided to convert the D-37 into four standard male D-25 connectors with all
control signals provided to each port (RTS, DTR, CTS, DSR, DCD, and RI).
1. If the default settings are correct, skip to step 2, otherwise refer to sections
2.1 and 2.2 of this document for detailed information on how to set the
address and IRQ level.
2. Turn off the power of the computer system in which the QS-100D is to be
installed.
3. Remove the system cover according to the instructions provided by the
computer manufacturer.
4. Install the QS-100D in any vacant expansion slot. The board should be
secured by installing the Option Retaining Bracket (ORB) screw.
5. Replace the system cover according to the instructions provided by the
computer manufacturer.
6. Attach and secure the cable connectors to the desired equipment.
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2.1 Setting the Base Address
The base address of the QS-100D is set using the two DIP switch packs. When
setting the address selection switches, a switch in the "ON" position specifies that
the corresponding address line must be a logic 0 for the port to be selected.
Similarly, a switch in the "OFF" position forces the corresponding address line to
be a logic 1 for the port to be selected.
A full sixteen bit address decode is implemented to reduce the chance of address
conflicts with other adapters in the system. Each serial port on the QS-100D uses
8 consecutive I/O locations. The four ports reside in a contiguous block of I/O
space in eight byte increments, for a total of 32 contiguous bytes, as shown in
Figure 4.
PORT
Serial 1
Serial 2
Serial 3
Serial 4
ADDRESS RANGE
Base Address + 0
to Base Address + 7
to Base Address + 15
to Base Address + 23
to Base Address + 31
Base Address + 8
Base Address + 16
Base Address + 24
Figure 4 --- Port Address Map
Switches SW1 and SW2 select address lines A15 through A5. The remaining
address lines (A4, A3, A2, A1 and A0) are used by the UART to select the
register being accessed. The sixth position on SW2 is used to enable or disable
the interrupt status register( See Figure 8).
Figure 5 shows how the switches on the QS-100D represent the address values for
serial ports. This figure can be used to explain the examples shown in Figure 5.
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A serial port's address is a 16-bit quantity that is most often expressed
in four hexadecimal (base 16) digits. A hex digit can hold a value from 0 to
15 (decimal), and is made up of four binary bits given weights of eight, four,
two, and one, hence the maximum value of 8+4+2+1 = 15.
A possible serial port address is 5220 hex. The example below shows
how the hex digits are broken down into binary bits.
Binary bits
0 1 0 1 0 0 1 0 0 0 1 0 0 0 0 0
8 4 2 1 8 4 2 1 8 4 2 1 8 4 2 1
0+4+0+1 0+0+2+0 0+0+2+0 0+0+0+0
Bit weight
Sum of bits
Hex digits
0
5
2
2
These address bits are set by the switches.
All other bits are considered to be zero.
0 1 0 1 0 0 1 0 0 0 1 0 0 0 0 0
Figure 5 --- Examination of a serial port base address
A4 - A0 are zero for the base address.
Switch on
bit = 0
Switch off
bit = 1
Position 6 of SW2 is used to enable or
disable the interrupt status register.
Factory default setting --- 0300 hex
SW1
SW2
ON
ON
1
0
2
3
0
4
0
5
0
6
0
1
2
2
3
0
4
0
0
5
0
6
(no digits)
0
1
0
3
0
Another Example --- 54A0 hex
SW1
SW2
ON
ON
1
0
2
4
3
0
4
1
5
0
6
4
1
0
2
3
8
4
0
5
2
6
(no digits)
0
A
4
0
5
Figure 5 --- Serial Port base I/O address selection switches
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2.2 Setting the Interrupt Level (IRQ)
The QS-100D allows the use of any interrupt level in the range IRQ2 to IRQ7,
IRQ10 to IRQ12, IRQ14, or IRQ15, selected using jumper pack J6. (Early
versions of the QS-100D are limited to IRQ2-7.) In Figure 6, the factory default
setting of IRQ3 is shown. To select a different IRQ, move the jumper to the
appropriate position on J6.
14
3
12 13
15 16 17 18 19 20 21 22
4
5
6
7
8
9
10 11
1
2
Default is IRQ 3
---
J6
Figure 6 --- Interrupt level (IRQ) selection
2.3 Configuring Interrupt Sharing
All ports on the QS-100D share the same interrupt level. Jumper J7 can be used
to connect the UART generated interrupt directly to the selected IRQ. J7 can also
be used to enable an interrupt sharing circuit, allowing the QS-100D to share its
interrupt with another Quatech adapter supporting sharable interrupts. In either
case, the software driving the serial ports must determine which port or ports are
requesting service when an interrupt is generated. To maintain 100% ISA bus
compatibility, J7 should be set in the non-sharable mode.
1
2
3
1
2
3
non-sharable
sharable
J7 --- Default is Sharable
Figure 7--- Sharable interrupt selection
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The QS-100D signals a hardware interrupt when any port requires service. The
interrupt signal is maintained until no port requires service. Because the ISA bus
is edge-sensitive, this behavior forces the interrupt service routine to ensure that
all ports are checked before exiting. A way to do this is to poll each port until an
interrupting port is found. After servicing the port, all ports should be checked
again. If any interrupting port is left unserviced the QS-100D will be unable to
signal any further interrupts.
2.4 Interrupt Status Register
The QS-100D is equipped with an interrupt status register which can be used to
simplify the servicing of shared interrupts. If this feature is enabled, the interrupt
status register is accessed in place of the scratchpad of any givenUART at base
address + 7. Virtually no commercially available software makes use of the
scratchpad register. The interrupt status register is read-only. The choice of using
the interrupt status register or the UART scratchpads (factory default) is made
using position 6 of switch SW2 as shown in Figure 8.
SW2
SW2
ON
ON
1
2
3
4
5
6
1
2
3
4
5
6
Interrupt Status Register
Scratchpad Register
(factory default)
Slide position 6 of SW2 toward the top of the QS-100D to enable the
interrupt status register, or toward the bottom of the QS-100D to disable it.
Figure 8--- Enabling the Interrupt Status Register
When a hardware interrupt occurs, reading the interrupt status register will return
the interrupt status of the entire QS-100D, as shown in Figure 9. Individual bits
are cleared as the interrupting ports are serviced. The interrupt service routine
must ensure that the interrupt status register reads zero before exiting, or the
QS-100D will be unable to signal subsequent interrupts.
If the QS-100D is of revision level 'C' or higher, an I/O write to the interrupt
status register will cause another hardware interrupt to be generated if the
interrupt status register is non-zero. The value written is ignored and has no effect
on the contents of the interrupt status register. Software written to take advantage
of this retriggering will be transparent to an older revision of the QS-100D.
BIT
DESCRIPTION
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7 (MSB)
0 (not used)
0 (not used)
6
5
4
3
2
1
0
0 (not used)
0 (not used)
Serial 4 --- 1 if interrupt pending
Serial 3 --- 1 if interrupt pending
Serial 2 --- 1 if interrupt pending
Serial 1 --- 1 if interrupt pending
Figure 9 --- Interrupt Status Register contents
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3. Windows 95 Configuration
Windows 95 maintains a registry of all known hardware installed in your
computer. Inside this hardware registry Windows 95 keeps track of all of your
system resources, such as I/O locations, IRQ levels, and DMA channels. The
"Add New Hardware Wizard" utility in Windows 95 was designed to add new
hardware and update this registry.
An “INF” configuration file is included with the QS-100D to allow easy
configuration in the Windows 95 environment . Also a custom Windows 95 serial
device driver is included with the QS-100D to support the use of the 16750
UART’s 64 byte fifo. Windows 95 uses the “INF” file to determine the system
resources required by the QS-100D, searches for available resources to fill the
boards requirements, and then updates the hardware registry with an entry that
allocates these resources.
Windows 95 will not automatically configure the QS-100D. The user is required
to manually configure the hardware to match the resources that Windows 95
allocates to the QS-100D. Another option is to use the “Device Manager” in
Windows 95 to change the system resources allocated to match the configuration
of the hardware. See section 3.2 for information on changing resources within
Windows 95.
3.1 Using the Add New Hardware Wizard
The following instructions provide step-by-step instructions on installing the
QS-100D in Windows 95 using the “Add New Hardware” wizard. Select
Start|Help from within Windows 95 for additional information on this utility.
1. Start the “Add New Hardware Wizard” utility. The icon for this utility is
located in the Windows 95 control panel.
2. A dialog box should appear explaining about “Add New Hardware
Wizard” utility. Click the “Next” button to continue.
3. An option box appears providing the choice of having Windows 95
automatically detect your new hardware. Click the “No” option. The
dialog in the box recommends selecting the “Yes” option, but unless the
hardware is installed at some standard I/O and IRQ levels, this option will
fail. Click the “Next” button to continue.
4. A hardware types list box should appear. Find the “Multi-function
Adapters” type on the list and click it. Click the “Next” button to
continue.
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5. A list box opens with Manufacturers on the left and the associated board
Models on the right. Click the “Have Disk” button.
6. An Install From Disk dialog box should pop up. Insert the diskette with the
Quatech INF files on it, select the correct drive letter, and click the “OK”
button. Windows 95 automatically browses the root directory for an INF
file that defines configurations for Multi-function Adapters. If no INF
files are found, click the “Browse” button and search the Win95 sub
directory on the installation diskette. You are not required to select the file
name. After finding the directory containing the INF files, Windows 95
will choose the correct file.
7. Your computer should read the INF file on the diskette and display a list of
Quatech Multi-function Adapter models supported by Windows 95. Select
the QS-100D Model Name from the list and click the Next button to
continue.
8. A dialog box will appear with an unused I/O range and IRQ resources that
Windows 95 has found available in the registry. Windows 95 has assigned
these resources to the QS-100D. Review these settings carefully before
proceeding. You should either take notes of these resources being
allocated to your new hardware, or have Windows 95 print a copy. You
are required to manually configure the QS-100D to match these resources.
Windows 95 will not automatically configure a QS-100D board.
9. The “Add New Hardware” utility now asks for your Windows 95
installation disks. Serial communication ports require two drivers
supplied by Microsoft to function: SERIAL.VXD and SERIALUI.DLL.
Insert the disk or CD and click “OK”.
NOTE:
You may be able to skip this step if you are certain that your system has the
latest version of these files installed. If you do not have your Windows 95
install disks immediately available, click “OK” anyway. A dialog box appears
with an option to Skip the files. Click the Skip button and the files will not be
installed. This is all right if the latest version of these drivers are currently in
the SYSTEM directory.
10. Another dialog box will open to tell you that the installation is complete.
Click the “Finish” button to end the software part of the installation.
11. Windows 95 now instructs you to shut down your computer and install the
hardware. Click “Yes” to shut down your computer. Wait until Windows
95 informs you that it is safe to turn your computer off. When this
message appears, power down your computer.
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12. You are required to manually configure the QS-100D to match the
resources allocated by Windows 95. Another option is to use the “Device
Manager” in Windows 95 to change the system resources allocated in
Windows 95 to match your preferences. See chapter 2 for information on
installing and configuring the QS-100D.
3.2 Viewing and Changing Resources with Device Manager
The following instructions provide step-by-step instructions on viewing and
changing resources of the QS-100D in Windows 95 using the “Device Manager”
utility. Select Start|Help from within Windows 95 for additional information on
this utility.
1. Double click the “System” icon inside the Control Panel folder. This
opens up the System Properties box.
2. Click the “Device Manager” tab located along the top of the System
Properties box. This lists all hardware devices registered inside the
Windows 95 registry. Additional information is available on any of these
devices by click on the device name and then selecting the “Properties”
button.
3. Double click the device group “Multi-function Adapters”. The QS-100D
model name should appear in the list of Multi-function adapters.
4. Double click the QS-100D model name and a properties box should open
for the hardware adapter.
5. Click the “Resources” tab located along the top of the properties box.
Confirm that the resources Windows 95 has allocated for the QS-100D
match the hardware configuration. To modify any of the resource settings
click the resource name and click the “Change Setting” button. Click
“Cancel” to exit without making changes.
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Figure 10--- Windows 95 Device Manager
6. If the “Change Settings” button was selected an Edit Resource window
will open up. Inside these Edit Resource windows click on the up/down
arrows to the right of the resource value. This scrolls you through all of
the allowable resources for your hardware. Pay attention to the Conflict
Information at the bottom of the window. Do not select a resource that
causes a conflict with any other installed hardware. Click “OK” to save
your changes, or “Cancel” to abort.
7. The QS-100D serial ports are also listed under the group Ports (Com and
LPT). Windows 95 does not assign COM1 - COM4 to ports addressed at
nonstandard locations. The QS-100D ports will be enumerated starting
with COM5 (or higher) even if lower logical numbers are available.
8. Select any of the Quatech Serial Ports listed under the group Port (Com
and LPT) and click the “Properties” button. This action opens a properties
dialog for the specific COM port on the QS-100D.
9. Click the “Port Settings” tab and then click the “Advanced” button. The
QS-100D driver will display a custom Advanced Port Settings control,
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which allows the ports UART compatibility mode and FIFO levels to be
configured. Note that FIFO option for each of the four ports QS-100D
ports is configured independently.
Figure 11 --- Windows 95 Device Manager
10. Use the Logical COM Ports numbers to access the serial ports on your
QS-100D through your software applications. Note: The Logical COM
Port name is assigned to your ports by Windows 95. This name is required
by a Windows 95 application when accessing a particular port.
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4. External Connections
RS-232-C devices are classified by their function as either Data Terminal
Equipment (DTE) or Data Communication Equipment (DCE). Generally, data
terminal equipment is defined as the communication source and data
communication equipment is defined as the device that provides a communication
channel between two DTE-type devices.
Terminal
DTE
Modem
DCE
RS-232-C
RS-232-C
Telephone
line
Terminal
DTE
Modem
DCE
Figure 12 --- Use of DTEs and DCEs in a communications link
DTE- and DCE-type devices have complementary pinouts to allow terminals and
modems to be connected directly using a one-to-one cable as shown in Figure 13.
In many applications, DCEs are unnecessary, and in these cases a cable called a
"null modem cable" or "modem eliminator cable" is used to directly connect two
DTE-type devices. A typical null modem cable is also shown in Figure 13.
(3)
(2)
(4)
(5)
(20)
(6)
(8)
(22)
(7)
(3)
(2)
(4)
(5)
(20)
(6)
(8)
(22) RI
(7)
RxD
TxD
RTS
CTS
DTR
DSR
DCD
RI
(3)
(2)
(4)
(5)
(20)
(6)
(8)
(22)
(7)
RxD
TxD
(3)
(2)
(4)
(5)
(20)
(6)
(8)
(22)
(7)
TxD
RxD
CTS
RTS
DSR
DTR
DCD
RI
RxD
TxD
RTS
CTS
DTR
DSR
DCD
RI
RTS
CTS
DTR
DSR
DCD
GND
GND
GND
GND
Typical DTE-to-DCE cable
Typical DTE-to-DTE null modem cable
Figure 13 --- Cabling requirements for RS-232-C devices
(cables using 25-pin connectors shown)
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The QS-100D connects to peripheral equipment through a single female D-37
connector, or using the adapter cable, four male D-25 connectors. The standard
serial port connections are listed in Figure 14.
RS-232 Signal
Description
Serial 1
Serial 2
serial 3
serial 4
D-37 D-25 D-37 D-25 D-37 D-25 D-37 D-25
TxD
RxD
RTS
CTS
DTR
DSR
DCD
RI
24
5
2
3
10
28
9
2
3
33
14
32
13
30
31
11
29
12
2
3
19
37
18
36
16
17
34
15
35
2
3
23
4
4
4
4
4
5
27
7
5
5
5
21
22
2
20
6
20
6
20
6
20
6
8
8
25
6
8
8
8
20
3
22
7
22
7
22
7
22
7
GND
26
Figure 14 --- QS-100D connector definitions
1
2
13
25
24
23
22
21
20
19
18
17
16
15
14
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
12
11
10
9
3
4
5
6
8
7
7
6
5
4
3
2
1
8
9
10
11
12
13
14
15
16
17
18
19
D-25 connector
(using adapter cable)
D-37 connector
(dashed lines delineate channels)
Figure 15 --- QS-100D output connectors
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5. Specifications
Bus interface:
Industry Standard Architecture (ISA)
16-bit bus
IBM PC-ATTM compatible
Dimensions:
6.65" x 3.7"
Serial ports
Controller:
Interface:
16550 (16750 optional)
One female D-37 connector
Four male D-25 connectors
using adapter cable
Transmit drivers: MC1488 or compatible
High level output: +9V min, +10.5V max
Low level output: -9V min, -10.5V max
Switching speed: 55ns typ, 100ns max
Receive buffers:
MC1489 or compatible
High level input: +3V to +13V
Low level input:
-3V to -13V
Switching speed: 120ns typ, 175ns max
I/O Address range:
Interrupt levels:
0000H - FFFFH
IRQ2 to IRQ7
IRQ10 to IRQ12,
IRQ14, IRQ15
Power requirements
+5 volts:
382 mA typ, 438 mA max
57 mA typ, 67 mA max
54 mA typ, 63 mA max
+12 volts:
-12 volts:
QS-100D User's Manual
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6. Troubleshooting
Listed here are some common problems and frequent causes of those problems.
Suggestions for corrective action are given. If the information here does not
provide a solution, contact Quatech Customer Service for technical support.
Any unauthorized repairs or modifications will void the QS-100D's warranty.
Computer will not boot up.
1. Is the QS-100D properly inserted? Remove the card and try again.
Perhaps try a different expansion slot.
2. Is the base address correctly set? Check for address conflicts with other
devices in the system. Remember that the QS-100D requires 32 bytes of
I/O space. Set a different address if necessary.
3. The QS-100D may be defective. Contact Quatech Customer Service for
instructions.
Cannot communicate with other equipment.
1. Are the cable connections correct? Are the cables securely attached?
2. Are the base address and interrupt level (IRQ) correctly set? Check for
address and IRQ conflicts with other devices in the system. Change the
settings if necessary.
3. If you are trying to communicate with a DTE, a null-modem cable may be
required.
4. If possible, use a loopback connector to test the port. This connector
needs to connect the following sets of signals on a D-25 connector:
TxD and RxD (pins 2 and 3)
RTS and CTS (pins 4 and 5)
DCD, DTR, DSR, and RI (pins 8, 20, 6 and 22)
Sample Code and a detailed description of the QS-100D's UARTs is available
on Quatech's BBS (330)434-2481.
QS-100D User's Manual
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QS-100D
User's Manual
Revision 3.11
March 2004
P/N: 940-0022-311
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