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User’s Guide
OMG-USB-SER-2
Two Port RS-232/422/485 to USB Adaptor
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Manual No. M-3899
Contents
INTRODUCTION..........................................................................1
OVERVIEW................................................................................................1
WHAT ’S INCLUDED................................................................................ 1
INSTALLATION ..........................................................................2
OPERATING SYSTEM INSTALLATION ................................................. 2
SYSTEM INSTALLATION........................................................................2
CONFIGURATION........................................................................4
ORIGINAL CONFIGURATION..................................................................4
ELECTRICAL INTERFACE SELECTION.................................................4
SWITCH EXAMPLES................................................................................6
SWITCH EXAMPLES CONTINUED........................................................7
TECHNICAL DESCRIPTION.........................................................8
FEATURES ................................................................................................ 8
CONNECTOR PIN ASSIGNMENTS..........................................................8
RS-422/485 (DB 9 Male)................................................................8
RS-232 (DB-9 Male) ........................................................................8
SPECIFICATIONS ........................................................................9
ENVIRONMENTAL SPECIFICATIONS....................................................9
MANUFACTURING..................................................................................9
POWER CONSUMPTION..........................................................................9
MEAN TIME BETWEEN FAILURES (MTBF).......................................9
PHYSICAL DIMENSIONS..........................................................................9
APPENDIX A - TROUBLESHOOTING.........................................10
APPENDIX B - HOW TO GET ASSISTANCE..............................11
APPENDIX C - ELECTRICAL INTERFACE ...................................12
RS-232.....................................................................................................12
RS-422.....................................................................................................12
RS-485.....................................................................................................13
APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ...............14
APPENDIX E - COMPLIANCE NOTICES .....................................15
FEDERAL COMMUNICATIONS COMMISSION STATEMENT ............ 15
CANADIAN RADIO INTERFERENCE REGULATIONS.........................15
EMC DIRECTIVE STATEMENT ........................................................... 16
Figures:
Figure 1: Switch SW2...........................................................................................5
Figure 2: RS422/485 Interface Configuration................................................6
Figure 3: Electrical Interface Configuration....................................................7
Figure 4 - Asynchronous Communications Bit Diagram.............................14
Introduction
Introduction
Overview
The OMG-USB-SER-2 equips the PC with 2 USB to RS-232/422/485
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-SER-2 is shipped with the following items. If any of these items
is missing or damaged, contact the supplier.
• OMG-USB-SER-2 USB to RS-232/422/485 Serial I/O Adapter
• USB Cable Part Number CA179 for Connecting to Upstream
Host/Hub
• Software
OMG-USB-SER-2 Page 1
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-SER-2 can be connected to any upstream type “A” port either at
the PC host or an upstream hub. The OMG-USB-SER-2 is hot pluggable,
m eaning there is no need to power down your computer prior to installation.
Connect the OMG-USB-SER-2 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-SER-2 Page 2
Installation
You can access your new COM: ports by using the assigned COM: identifiers as
shown above. In this case, it is COM 3 and 4. However, this assignment will vary
from system to system. At this point, the hardware is recognized and ready to
use.
OMG-USB-SER-2 Page 3
Configuration
Configuration
Original configuration
This device ships with the following configuration.
422 mode,
120 ohm termination,
1K ohm pull up on RX+
1K ohm pull down on RX-
In order to change this configuration the box must be opened. Do this by
removing the four screws located on the bottom. When reassembling please note
that the top and bottom are keyed to fit in only one direction.
Electrical Interface Selection
Each of the two ports on the OMG-USB-SER-2 can be individually configured as
an RS-232, RS-422, or RS-485 interface. This is selectable via the DIP switches
and DIP shunts. Each of the switch positions is described on the following page.
OMG-USB-SER-2 Page 4
Port 1
PD
Switch Descriptions
Port 2
L
L
T
PU
Figure 1: Switch SW4
L 485 option, OFF for 422.
OFF: No effect
ON : Connects TX+ to RX+ for two-wire operation
L 485 option, OFF for 422.
OFF: No effect
ON : Connects TX- to RX- for two-wire operation
PU 485 option, OFF for 422.
OFF: No effect
ON : Adds a 1 K ohm pull-up resist or to RX+
PD 485 option, OFF for 422.
OFF: No effect
ON : Adds a 1 K ohm pull-down resistor to RX-
T 422 and 485 option.
OFF: No effect
ON : Adds a 120 ohm termination resistor between RX+ and RX-
SW4
OFF
1 2 3 4 5 6 7 8
9 10
Configuration
ON
L
L
T
PU
PD
OMG-USB-SER-2 Page 5
NE 2
Switch Examples
485 1
NE 1
485 2
Figure 2: RS422/485 Interface Configuration
485 Mode Selection
OFF : 422 Mode
The transmitter lines TX+ and TX- are always driven
ON : 485 Mode
The transmitter lines TX+ and TX- are switched to high
impedance when the device is not actively transmitting data
NE 485 option, OFF for 422
OFF : The receiver is always enabled. In a two-wire setup the
receiver will echo back all transmitted data.
ON : The receiver is disabled when the transmitter is enabled. In a
two-wire setup the receiver will not echo back transmitted data.
SW3
OFF
1 2 3 4
Configuration
ON
Note: Switch positions 1 and 2 are for port 1 and switch positions 3 and 4 for port
2.
OMG-USB-SER-2 Page 6
Configuration
E5
Switch Examples Continued
Port 2 Port 1
RS 232 RS 232
RS 422/485
Port 2
L
L
T
PU
PD
E6
Figure 3: Electrical Interface Configuration
Port 1 : RS-232
The corresponding shunt is in the 232 position. The switches will have
no effect.
Port 2 : RS-485 two wire communication with no echo.
The corresponding shunt is in the 422/485 position. Switches 485 2,
NE 2, and Port 2 L, L, T, PU, and PD are all in the ON position.
SW4
OFF
1 2 3 4 5 6 7 8
9 10
ON
RS 422/485
Port 1
L
L
T
PU
PD
E7 E8
OMG-USB-SER-2 Page 7
Technical
Technical Description
The OMG-USB-SER-2 utilizes two 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-232/422/485 transceiver supports data rates up to
921.6K baud for RS-422/485 and up to 460.8K baud for RS-232.
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
Connector Pin Assignments
RS-422/485 (DB 9 Male)
Signal Name Pin # Mode
GND Ground 5
TX + Transmit Data Positive 4 Output
TX- Transmit Data Negative 3 Output
RTS+ Request To Send Positive 6 Output
RTS- Request To Send Negative 7 Output
RX+ Receive Data Positive 1 Input
RX- Receive Data Negative 2 Input
CTS+ Clear To Send Positive 9 Input
CTS- Clear To Send Negative 8 Input
RS-232 (DB-9 Male)
Signal Name Pin # Mode
GND Ground 5
TX Transmit Data 3 Output
RTS Request To Send 7 Output
DTR Data Terminal Ready 4 Output
RX Receive Data 2 Input
CTS Clear To Send 8 Input
DSR Data Set Ready 6 Input
DCD Data Carrier Detect 1 Input
RI Ring Indicator 9 Input
OMG-USB-SER-2 Page 8
Specifications
Specifications
Environmental Specifications
Specification Operating Storage
Temperature Range
Humidity Range 10 to 90% R.H.
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.
0º to 50º C
(32º to 122º F)
Non-Condensing
-20º to 70º C
(-4º to 158º F)
10 to 90% R.H.
Non-Condensing
Mean Time Between Failures (MTBF)
Greater than 150,000 hours. (Calculated)
Physical Dimensions
Package Length 7.06 inches (17.93 cm)
Package Width 5.32 inches (13.51 cm)
Package Height 1.50 inches (3.81 cm)
OMG-USB-SER-2 Page 9
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-SER-2 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-SER-2 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-SER-2 is ready for use in
your application.
5. Please note that if the adapter is configured for 2 wire RS-485 with no echo a
loopback test is not possible. The receiver in this case will be turned off and
the test will fail. If you plan on using this device in two wire mode test the
adapter in RS-422 mode first. Then configure the adapter for your
application.
OMG-USB-SER-2 Page 10
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
home page address is www.omega.com. The latest software
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 1-800DAS-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-SER-2 Page 11
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-SER-2 is a
DTE device.
RS-422
The RS-422 specification defines the electrical characteristics of balanced voltage
digital interface circuits. RS-422 is a differential interface that defines voltage
levels and driver/receiver electrical specifications. On a differential interface,
logic levels are defined by the difference in voltage between a pair of outputs or
inputs. In contrast, a single ended interface, for example RS-232, defines the logic
levels as the difference in voltage between a s ingle signal and a common ground
connection. Differential interfaces are typically more immune to noise or voltage
spikes that may occur on the communication lines. Differential interfaces also
have greater drive capabilities that allow for longer cable le ngths. RS-422 is rated
up to 10 Megabits per second and can have cabling 4000 feet long. RS-422 also
defines driver and receiver electrical characteristics that will allow 1 driver and up
to 32 receivers on the line at once. RS-422 signal levels range from 0 to +5 volts.
RS-422 does not define a physical connector.
OMG-USB-SER-2 Page 12
Appendix C - Electrical Interface
RS-485
RS-485 is backwardly compatible with RS-422; however, it is optimized for
partyline or multi-drop applications. The output of the RS-422/485 driver is
capable of being Active (enabled) or Tri-State (disabled). This capability allows
multiple ports to be connected in a multi-drop bus and selectively polled. RS-485
allows cable lengths up to 4000 feet and data rates up to 10 Megabits per second.
The signal levels for RS-485 are the same as those defined by RS-422. RS-485 has
electrical characteristics that allow for 32 drivers and 32 receivers to be
connected to one line. This interface is ideal for multi-drop or network
environments. RS-485 tri-state driver (not dual-state) will allow the electrical
presence of the driver to be removed from the line. Only one driver may be active
at a time and the other driver(s) must be tri-stated. RS-485 can be cabled in two
ways, two wire and four wire mode. Two wire mode does not allow for full duplex
communication and requires that data be transferred in only one direction at a
time. For half-duplex operation, the two transmit pins should be connected to the
two receive pins (Tx+ to Rx+ and Tx- to Rx-). Four wire mode allows full duplex
data transfers. RS-485 does not define a connector pin -out or a set of modem
control signals. RS-485 does not define a physical connector.
OMG-USB-SER-2 Page 13
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
1
0
5 to 8 Data Bits
Figure 4 - Asynchronous Communications Bit Diagram
Odd, Even
or
Unused
P
BIT
STOP
Remain Idle or
next start bit
1
1.5
2
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-SER-2 Page 14
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 re sidential 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-SER-2 Page 15
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-SER-2 Page 16
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month
grace period to the normal one (1) year product warranty to cover handling and shipping time. This
ensures that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’sWARRANTY does not apply to defects resulting from any action of the purchaser , including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. 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, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components which wear are not warranted, including but not
limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be
as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE,
AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY / DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in suc h a manner.
RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN
(AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID
PROCESSING DELAYS). The assigned AR number should then be marked 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 W
ARRANTY
RETURNS, please have the
following information available BEFORE
contacting OMEGA:
1. Purc hase Order number under which the product
was PURCHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific problems
relative to the product.
FOR NON-W
ARRANTY
REPAIRS,
consult OMEGA
for current repair charges. Have the following
information available BEFORE contacting OMEGA:
1. Purchase Order number to cover the COST
of the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems
relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2002 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the
prior written consent of OMEGA ENGINEERING, INC.
M3899/0303
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