User’s Guide
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OMG-USB-232-4
Four Port RS-232 to USB Adaptor
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Contents
INTRODUCTION..........................................................................1
OVERVIEW................................................................................................ 1
WHAT’S INCLUDED................................................................................ 1
INSTALLATION ..........................................................................2
OPERATING SYSTEM INSTALLATION................................................. 2
SYSTEM INSTALLATION........................................................................ 2
CONFIGURATION........................................................................4
ELECTRICAL INTERFACE SELECTION................................................. 4
TECHNICAL DESCRIPTION .........................................................5
FEATURES................................................................................................ 5
RS-232 (DB-9 Male)........................................................................ 5
SPECIFICATIONS ........................................................................6
ENVIRONMENTAL SPECIFICATIONS.................................................... 6
MANUFACTURING.................................................................................. 6
POWER CONSUMPTION.......................................................................... 6
MEAN TIME BETWEEN FAILURES (MTBF) ....................................... 6
PHYSICAL DIMENSIONS.......................................................................... 6
APPENDIX A - TROUBLESHOOTING ...........................................7
APPENDIX B - HOW TO GET ASSISTANCE ................................8
APPENDIX C - ELECTRICAL INTERFACE.....................................9
RS-232....................................................................................................... 9
APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ...............10
APPENDIX E - COMPLIANCE NOTICES .....................................11
FEDERAL COMMUNICATIONS COMMISSION STATEMENT............ 11
CANADIAN RADIO INTERFERENCE REGULATIONS......................... 11
EMC DIRECTIVE STATEMENT........................................................... 12
Figure 1 - Asynchronous Communications Bit Diagram.............................10
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Introduction
Introduction
Overview
The OMG-USB-232-4 equips the PC with 4 USB to RS-232 Asynchronous serial
ports providing a versatile interface for common serial needs. The advantage of
this product over more traditional approaches is that it does not require opening
the computer case, nor does it require resources such as I/O ports or IRQ’s. It
does require a system that supports USB both in terms of hardware and
operating system.
What’s Included
The OMG-USB-232-4 is shipped with the following items. If any of these items
is missing or damaged, contact the supplier.
·
·
OMG-USB-232-4 USB to RS-232 Serial I/O Adapter
USB Cable Part Number CA179 for Connecting to Upstream
Host/Hub
Software
·
OMG-USB-232-4
Page 1
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Installation
Installation
Operating System Installation
Choose Install Software at the beginning of the CD and install SeaCOM.
System Installation
The screen captures below are taken from a Windows 98 installation. Your
particular operating system may differ slightly from what is shown based on your
version of Windows.
The OMG-USB-232-4 can be connected to any upstream type “A” port either at
the PC host or an upstream hub. The OMG-USB-232-4 is hot pluggable,
meaning there is no need to power down your computer prior to installation.
Connect the OMG-USB-232-4 to an upstream host or hub.
The New Hardware Found wizard will now proceed to locate the appropriate
drivers. These drivers were installed during the SeaCOM software setup
procedure. Once the drivers are found a new window will pop up indicating the
installation of each of the four new ports.
If you view the system’s Device Manager, you should have new “COM” ports in
the Ports (COM & LPT) Device Class. This is shown on the following page.
OMG-USB-232-4
Page 2
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Installation
You can access your new COM: ports by using the assigned COM: identifiers as
shown above. In this case, it is COM3, 4, 5 and 6. However, this assignment will
vary from system to system. At this point, the hardware is recognized and ready
to use.
OMG-USB-232-4
Page 3
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Configuration
Configuration
Electrical Interface Selection
Each of the four ports on the OMG-USB-232-4 is pre-configured as an RS-232
interface.
Simply install the included software and connect the adapter to your USB port.
The device is immediately recognized by the system. At that point, connect the
adapter to your target device (i.e. modem, serial printer, scale, bar code, etc.).
Now your non-USB peripherals can have the same connection simplicity and
ease of use as USB peripherals.
OMG-USB-232-4
Page 4
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Technical
Technical Description
The OMG-USB-232-4 utilizes four USB UARTs. These chips feature
programmable baud rate, data format, 128 byte Dual Port TX Buffer, and 384 byte
Dual Port RX Buffer. The RS-232 transceiver supports data rates up to 460.8K
baud.
Features
·
·
·
Hot pluggable device that does not require opening the case
No system resources are required (i.e. I/O ports or IRQ’s)
LED status indicators for USB Enabled and port activity
RS-232
(DB-9 Male)
Signal
GND
TX
RTS
DTR
RX
CTS
DSR
DCD
RI
Name
Ground
Pin #
Mode
5
3
7
4
2
8
6
1
9
Transmit Data
Request To Send
Data Terminal Ready
Receive Data
Clear To Send
Data Set Ready
Data Carrier Detect
Ring Indicator
Output
Output
Output
Input
Input
Input
Input
Input
OMG-USB-232-4
Page 5
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Specifications
Specifications
Environmental Specifications
Specification
Temperature Range
Operating
0º to 50º C
Storage
-20º to 70º C
(32º to 122º F)
10 to 90% R.H.
Non-Condensing
(-4º to 158º F)
10 to 90% R.H.
Non-Condensing
Humidity Range
Manufacturing
·
All Printed Circuit boards are built to UL 94V0 rating and are 100%
electrically tested. These printed circuit boards are solder mask over bare
copper or solder mask over tin nickel.
Power Consumption
This device is a high power USB device. It must be plugged into the USB root
hub or a self powered hub capable of supplying 500 mA per port.
Mean Time Between Failures (MTBF)
Greater than 150,000 hours. (Calculated)
Physical Dimensions
Package Length
Package Width
Package Height
7.06 inches
5.32 inches
1.50 inches
(17.93 cm)
(13.51 cm)
(3.81 cm)
OMG-USB-232-4
Page 6
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Appendix A – Troubleshooting
Appendix A - Troubleshooting
Serial Utility test software is supplied with the adapter and will be used in the
troubleshooting procedures. Using this software and following these simple
steps, most common problems can be eliminated without the need to call
Technical Support.
1. If your adapter isn’t working, first check to make sure that USB support is
enabled in the System BIOS and it is functioning properly in the operating
system. This can be done by using either the Windows 98/ME or Windows
2000 Device Manager.
2. Ensure that the software has been installed on the machine so that the
necessary files are in place to complete the installation.
3. When the OMG-USB-232-4 is configured properly, the USB Enabled LED
(E) will be lit. This should allow you to use the WinSSD utility and the
supplied loopback plug to check communications. The supplied loopback
plug connects TD to RD. If you decide to test the Modem Control Signals, a
full pin loopback plug will be required. Details on loopback plugs are
included on WinSSD. Contact Omega if you need further assistance
4. When testing the OMG-USB-232-4 in loopback mode, you should see the
port LED’s flashing as well as seeing echoed data on the screen. The
loopback test first transmits a HEX pattern, 55AA, and then a ASCII string
of data. If this test passes, then the OMG-USB-232-4 is ready for use in
your application.
OMG-USB-232-4
Page 7
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Appendix B – How To Get Assistance
Appendix B - How To Get Assistance
Please refer to
Appendix A - Troubleshooting prior to calling Technical Support.
1. Read this manual thoroughly before attempting to install the
adapter in your system.
2. When calling for technical assistance, please have your user
manual and current adapter settings. If possible, please have the
adapter connected in a computer ready to run diagnostics.
3. Omega Engineering maintains a home page on the Internet. Our
updates, and newest manuals are available via our FTP site that can
be accessed from our home page.
4. Technical support is available Monday thru Friday from 8:30 a.m. to
6:00 p.m. Eastern time. Technical support can be reached at 1-800-
DAS-IEEE.
RETURN AUTHORIZATION MUST BE OBTAINED FROM OMEGA BEFORE
RETURNED MERCHANDISE WILL BE ACCEPTED. AUTHORIZATION CAN
BE OBTAINED BY CALLING OMEGA CUSTOMER SERVICE AND
REQUESTING AN AUTHORIZED RETURN (AR) NUMBER.
OMG-USB-232-4
Page 8
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Appendix C - Electrical Interface
Appendix C - Electrical Interface
RS-232
Quite possibly the most widely used communication standard is RS-232. This
implementation has been defined and revised several times and is often referred
to as RS-232 or EIA/TIA-232. The IBM PC computer defined the RS-232 port on a
9 pin D sub connector and subsequently the EIA/TIA approved this
implementation as the EIA/TIA-574 standard. This standard is defined as the
9-Position Non-Synchronous Interface between Data Terminal Equipment and
Data Circuit-Terminating Equipment Employing Serial Binary Data
Interchange. Both implementations are in wide spread use and will be referred to
as RS-232 in this document. RS-232 is capable of operating at data rates up to 20
Kbps at distances less than 50 ft. The absolute maximum data rate may vary due
to line conditions and cable lengths. RS-232 is a single ended or unbalanced
interface, meaning that a single electrical signal is compared to a common signal
(ground) to determine binary logic states. The RS-232 and the EIA/TIA-574
specification define two types of interface circuits, Data Terminal Equipment
(DTE) and Data Circuit-Terminating Equipment (DCE). The OMG-USB-232-4 is a
DTE device.
OMG-USB-232-4
Page 9
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Appendix D - Asynchronous Communications
Appendix D - Asynchronous Communications
Serial data communications implies that individual bits of a character are
transmitted consecutively to a receiver that assembles the bits back into a
character. Data rate, error checking, handshaking, and character framing
(start/stop bits) are pre-defined and must correspond at both the transmitting
and receiving ends.
Asynchronous communications is the standard means of serial data
communication for PC compatibles and PS/2 computers. The original PC was
equipped with a communication or COM: port that was designed around an 8250
Universal Asynchronous Receiver Transmitter (UART). This device allows
asynchronous serial data to be transferred through a simple and straightforward
programming interface. Character boundaries for asynchronous communications
are defined by a starting bit followed by a pre-defined number of data bits (5, 6, 7,
or 8). The end of the character is defined by the transmission of a pre-defined
number of stop bits (usually 1, 1.5 or 2). An extra bit used for error detection is
often appended before the stop bits.
Idle state of
line
Odd, Even
or
Unused
Remain Idle or
next start bit
5 to 8 Data Bits
1
P
BIT
STOP
0
1
1.5
2
Figure 1 - Asynchronous Communications Bit Diagram
This special bit is called the parity bit. Parity is a simple method of determining if
a data bit has been lost or corrupted during transmission. There are several
methods for implementing a parity check to guard against data corruption.
Common methods are called (E)ven Parity or (O)dd Parity. Sometimes parity is
not used to detect errors on the data stream. This is refereed to as (N)o parity.
Because each bit in asynchronous communications is sent consecutively, it is
easy to generalize asynchronous communications by stating that each character
is wrapped (framed) by pre-defined bits to mark the beginning and end of the
serial transmission of the character. The data rate and communication parameters
for asynchronous communications have to be the same at both the transmitting
and receiving ends. The communication parameters are baud rate, parity, number
of
data
bits
per
character,
and
stop
bits
(i.e. 9600,N,8,1).
OMG-USB-232-4
Page 10
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Appendix E - Compliance Notices
Appendix E - Compliance Notices
Federal Communications Commission Statement
This equipment has been tested and found to comply with the limits for Class B
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 residential installation. 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.
However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the
following measures:
·
·
·
Reorient or relocate the receiving antenna
Increase the separation between the equipment and receiver
Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected
·
Consult the dealer or an experienced radio/TV technician for help
Caution
Omega Engineering is not responsible for any radio or television interference
caused by unauthorized modifications of this equipment or the substitution of
attachment of connecting cables and equipment other than those specified by
Omega Engineering. Such unauthorized modifications, substitutions, or
attachments may void the user’s authority to operate the equipment. The
correction of interference caused by such unauthorized modifications,
substitutions, or attachments will be the responsibility of the user.
Always use cabling provided with this product if possible. If no cable is
provided or if an alternate cable is required, use high quality shielded cabling to
maintain compliance with FCC directives.
Canadian Radio Interference Regulations
This Class B digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.
Cet Appareil numérique de la classe B respecte toutes les exigences de
Règlement sur le matériel du Canada
OMG-USB-232-4
Page 11
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Appendix E - Compliance Notices
EMC Directive Statement
Products bearing the CE Label fulfill the requirements of
the EMC directive (89/336/EEC) and of the low-voltage
directive (73/23/EEC) issued by the European Commission.
To obey these directives, the following European
standards must be met:
EN55022 Class B - ‘Limits and methods of measurement of
radio
interference characteristics of information technology equipment’
EN55024-‘Information
technology
equipment
Immunity
characteristics Limits and methods of measurement.
EN60950 (IEC950)
-
‘Safety of information technology
equipment, including electrical business equipment’
Always use cabling provided with this product if possible. If no cable is
provided or if an alternate cable is required, use high quality shielded cabling to
maintain compliance with EMC directives.
OMG-USB-232-4
Page 12
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WARRANTY/DIS CLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in m aterials and workm anship for a
period of 13 m o n t h s from date of purchase. OMEGA’s WARRANTY adds an additional one (1) m onth
grace period to the norm al o n e (1 ) ye a r p ro d u c t w a rra n t y to cover handling and shipping tim e. This
ensures that OMEGA’s custom ers receive m axim um coverage on each product.
If the unit m alfunctions, it m ust be returned to the factory for evaluation. OMEGA’s Custom er Service
Departm ent will issue an Authorized Return (AR) num ber im m ediately upon phone or written request.
Upon exam ination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, includ-
in g b u t n o t lim ite d to m is h a n d lin g , im p ro p e r in te rfa cin g , o p e ra tio n o u ts id e o f d e s ig n lim its ,
im proper repair, or unauthorized m odification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, m oisture or vibration; im proper specification; m isapplication; m isuse or other operating
conditions outside of OMEGA’s control. Com ponents which wear are not warranted, including but not
lim ited to contact points, fuses, and triacs.
O M EG A is p le a s e d t o o ff e r s u g g e s t io n s o n t h e u s e o f it s va r io u s p ro d u c t s . Ho w e ve r,
OMEGA neither assum es responsibility for any om issions or errors nor assum es liability for any
dam ages that result from the use of its products in accordance w ith inform ation provided by
OMEGA, either verbal or w ritten. OMEGA w arrants only that the parts m anufactured by it w ill be
a s s p e c if ie d a n d f r e e o f d e f e c t s . O M EG A M A KES N O OTHER WA RRA N TIES O R
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE,
AND ALL IMP LIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND
FITN ES S FO R A PA RTIC U LA R P U RP O S E A RE HEREBY D IS C LA IM ED. LIM ITATIO N O F
LIABILITY: The rem edies of purchaser set forth herein are exclusive, and the total liability of
OMEGA w it h re s p e c t t o t h is o rd e r, w h e t h e r b a s e d o n c o n t ra c t , w a rra n t y, n e g lig e n c e ,
in d e m n ific a t io n , s t ric t lia b ilit y o r o t h e rw is e , s h a ll n o t e xc e e d t h e p u rch a s e p ric e o f t h e
c o m p o n e n t u p o n w h ic h lia b ilit y is b a s e d . In n o e v e n t s h a ll O M EG A b e lia b le f o r
consequential, incidental or special dam ages.
CONDITIONS: Equipm ent sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Com ponent” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in m edical
applications or used on hum ans. Should any Product(s) be used in or with any nuclear installation or
activity, m edical application, used on hum ans, or m isused in any way, OMEGA assum es no responsibility
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indem nify
OMEGA and hold OMEGA harm less from any liability or dam age whatsoever arising out of the use of the
Product(s) in such a m anner.
RETURN REQUESTS /INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Custom er Service Departm ent. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN
(AR) NUMBER FROM OMEGA’S CUS TOMER S ERVICE DEPARTMENT (IN ORDER TO AVOID
PROCESSING DELAYS). The assigned AR num ber should then be m arked on the outside of the return
package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.
FOR WARRANTY RETURNS, please have the
following inform ation available BEFORE
contacting OMEGA:
FOR NON-WARRANTY REPAIRS, consult OMEGA
for current repair charges. Have the following
inform ation available BEFORE contacting OMEGA:
1. Purchase Order number under which the product
was PURCHASED,
1. Purchase Order num ber to cover the COST
of the repair,
2. Model and serial num ber of the product under
warranty, and
3. Repair instructions and/or specific problem s
relative to the product.
2. Model and serial num ber of the product, and
3. Repair instructions and/or specific problem s
relative to the product.
OMEGA’s policy is to m ake running changes, not m odel changes, whenever an im provem ent is possible. This affords
our custom ers the latest in technology and engineering.
OMEGA is a registered tradem ark of OMEGA ENGINEERING, INC.
© Copyright 2002 OMEGA ENGINEERING, INC. All rights reserved. This docum ent m ay not be copied, photocopied,
reproduced, translated, or reduced to any electronic m edium or m achine-readable form , in whole or in part, without the
prior written consent of OMEGA ENGINEERING, INC.
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Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
TEMPERATURE
Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies
Wire: Thermocouple, RTD & Thermistor
Calibrators & Ice Point References
Recorders, Controllers & Process Monitors
Infrared Pyrometers
PRESSURE, STRAIN AND FORCE
Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Ⅺ
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Load Cells & Pressure Gages
Displacement Transducers
Instrumentation & Accessories
FLOW/LEVEL
Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Rotameters, Gas Mass Flowmeters & Flow Computers
Air Velocity Indicators
Turbine/Paddlewheel Systems
Totalizers & Batch Controllers
pH/CONDUCTIVITY
Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ Ⅺ
ߜ pH Electrodes, Testers & Accessories
Benchtop/Laboratory Meters
Controllers, Calibrators, Simulators & Pumps
Industrial pH & Conductivity Equipment
DATA ACQUISITION
Ⅺ
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ߜ Ⅺ
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ߜ Ⅺ
ߜ Data Acquisition & Engineering Software
Communications-Based Acquisition Systems
Plug-in Cards for Apple, IBM & Compatibles
Datalogging Systems
Recorders, Printers & Plotters
HEATERS
Ⅺ
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Cartridge & Strip Heaters
Immersion & Band Heaters
Flexible Heaters
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ENVIRONMENTAL
MONITORING AND CONTROL
Ⅺ
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ߜ Metering & Control Instrumentation
Refractometers
Pumps & Tubing
Air, Soil & Water Monitors
Industrial Water & Wastewater Treatment
pH, Conductivity & Dissolved Oxygen Instruments
M3895/0303
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