Omega OMG-USB-SER-4 User Manual

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User’s Guide

OMG-USB-SER-4

Four Port RS-232/422/485 to USB Adaptor

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The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

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 Mal e)................................................................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: Switches SW2 and SW4.....................................................................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-4 equips the PC with 4 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-4 is shipped with the following items. If any of these items
is missing or damaged, contact the supplier.

• OMG-USB-SER-4 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-4 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-4 can be connected to any upstream type “A” port either at
the PC host or an upstream hub. The OMG-USB-SER-4 is hot pluggable,
meaning there is no need to power down your computer prior to installation.

Connect the OMG-USB-SER-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-SER-4 Page 2

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-SER-4 Page 3