Omega Products OMG-ISO-COMM Installation Manual

www.omega.com

e-mail: [e-mail]

User’s Guide

OMG-ISO-COMM

Isolated ISA RS-232/422/485 Interface Board

Shop online at

Servicing North America:

USA: One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford CT 06907-0047

TEL: [phone] FAX: [phone]
e-mail: [e-mail]

Canada: 976 Bergar

Laval (Quebec) H7L 5A1, Canada
TEL: [phone] FAX: [phone]
e-mail: [e-mail]

For immediate technical or application assistance:

USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA

®

Customer Service: 1-800-622-2378 / 1-800-622-BEST

®

Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

®

TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA

Mexico: En Espan˜ ol: [phone]-7803 e-mail: [e-mail]

FAX: [phone] [e-mail]

Servicing Europe:

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands

TEL: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [e-mail]

Czech Republic: Frystatska 184, 733 01 Karviná, Czech Republic

TEL: [phone] FAX: [phone]
Toll Free: 0800-1-66342 e-mail: [e-mail]

France: 11, rue Jacques Cartier, 78280 Guyancourt, France

TEL: [phone] FAX: [phone]
Toll Free in France: 0800 466 342
e-mail: [e-mail]

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

TEL: [phone] FAX: [phone]
Toll Free in Germany: 0800 639 7678
e-mail: [e-mail]

United Kingdom: One Omega Drive, River Bend Technology Centre

ISO 9002 Certified Northbank, Irlam, Manchester

M44 5BD United Kingdom
TEL: [phone] FAX: [phone]
Toll Free in United Kingdom: 0800-488-488
e-mail: [e-mail]

OMEGAnet®Online Service Internet e-mail

www.omega.com [e-mail]

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.

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

FACTORY DEFAULT SETTINGS ............................................................ 1

CARD SETUP ..............................................................................2

ADDRESS SELECTION.............................................................................2

PORT ENABLE / DISABLE.......................................................................3

IRQ SELECTION......................................................................................3

INTERRUPT MODE OPTIONS................................................................4

HEADERS E8 AND E9...............................................................................6

INTERFACE OPTIONS ............................................................................. 7

RS-232....................................................................................................7

RS-422....................................................................................................7

Combined RS-232 and RS-422............................................................7

INSTALLATION ..........................................................................8

OPERATING SYSTEM INSTALLATION ................................................. 8

For Windows Users ............................................................................8

Other Operating Systems ...................................................................8

SYSTEM INSTALLATION........................................................................8

TECHNICAL DESCRIPTION.........................................................9

CONNECTOR PIN ASSIGNMENTS........................................................10

RS-422 (DB 9 Male)......................................................................10

RS-232 (DB 9 Male)......................................................................10

SPECIFICATIONS ......................................................................11

ENVIRONMENTAL SPECIFICATIONS..................................................11

MANUFACTURING................................................................................11

POWER CONSUMPTION........................................................................11

MEAN TIME BETWEEN FAILURES (MTBF).....................................11

PHYSICAL DIMENSIONS........................................................................11

APPENDIX A - TROUBLESHOOTING .........................................12

APPENDIX B - HOW TO GET ASSISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

APPENDIX C - ELECTRICAL INTERFACE ...................................15

RS-232.................................................................................................... 15

RS-422.................................................................................................... 15

RS-485.................................................................................................... 16

APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ...............17

APPENDIX E - SILK-SCREEN ....................................................19

APPENDIX F - COMPLIANCE NOTICES ...................................20

FEDERAL COMMUNICATIONS COMMISSION STATEMENT............ 20

EMC DIRECTIVE STATEMENT........................................................... 20

Figures

Figure 1 - Address Selection Table....................................................................2

Figure 2 - DIP-Switch Illustration......................................................................2

Figure 3 - Headers E1, E2, E3, and E4 (Factory Default).................................3

Figure 4 - Header E5, Normal IRQ Mode...........................................................4

Figure 5 - Header E5, Shared IRQ Mode ...........................................................4

Figure 6 - Header E5, Sharing IRQs with another adapter............................5

Figure 7 - IRQ Headers E1 - E5 (Factory Default)...........................................5

Figure 8 - Headers E8 and E9 RS-485 Mod e Enable........................................6

Figure 9 - Four Port RS-232/RS -422 Configuration Table...........................7

Figure 10 - Asynchronous Communications Bit Diagram..........................17

Introduction

Introduction

Overview

The OMG-ISO-COMM provides the PC with additional ground isolated serial
ports for terminals, modems, printers, etc. Isolation is important in installations
where the equipment being connected to the PC is either far from the PC, or on a
different power transformer circuit . Ground loop current is a commonly neglected
and misunderstood phenomena that leads to the failure (and destruction) of
communication interfaces. The OMG-ISO-COMM isolated boards provide up to
500 volts DC of isolation.

The OMG-ISO-COMM provides two or four DOS and Windows compatible
serial ports, and also offers extended ‘AT’ interrupts. Each port is independently
addressable as COM1: through COM4:, or any other I/O address up to 3FF Hex.

What’s Included

The OMG-ISO-COMM is shipped with the following items. If any of these items
are missing or damaged, contact the supplier.

• OMG-ISO-COMM Serial I/O Adapter

• Cable providing 2 DB-9 connectors.

• Software

Factory Default Settings

The OMG-ISO-COMM factory default settings are as follows:

Port # Base Address IRQ

Port 1 3F8 4
Port 2 2F8 3
Port 3 3E8 4
Port 4 2E8 3

For your reference, record installed OMG-ISO-COMM settings below:

Port # Base Address IRQ

Port 1
Port 2
Port 3
Port 4

OMG-ISO-COMM Page 1

Card Setup

Card Setup

The OMG-ISO-COMM contains several jumper straps which must be set for
proper operation.

Address Selection

Each port on the OMG-ISO-COMM occupies 8 consecutive I/O locations. A
DIP-switch is used to set the base address for these locations. Be careful when
selecting the base address as some selections conflict with existing ports. The
following table shows several examples that typically do not cause a conflict.
SW4 sets the I/O address for port 1, SW3 sets the address for port 2, SW2 sets
the address for port 3 and SW1 sets the address for port 4.

Address Binary Switch Position Setting

Hex A9 A0 1 2 3 4 5 6 7

280-287 1010000XXX Off On Off On On On On
2A0-2A7 1010100XXX Off On Off On Off On On
2E8-2EF 1011101XXX Off On Off Off Off On Off
2F8-2FF 1011111XXX Off On Off Off Off Off Off
3E8-3EF 1111101XXX Off Off Off Off Off On Off
300-307 1100000XXX Off Off On On On On On
328-32F 1100101XXX Off Off On On Off On Off
3F8-3FF 1111111XXX Off Off Off Off Off Off Off

Figure 1 - Address Selection Table

The following illustration shows the correlation between the DIP-switch setting
and the address bits used to determine the base address. In the example below,
address 300 is selected as a base. Address 300 in binary is XX11 0000 0XXX
where X = a non-selectable address bit.

A9 A38E

ON

OFF

1 2 3 4 5 6 7

Figure 2 - DIP-Switch Illustration

Note: Setting the switch ‘On’ or ‘Closed’ corresponds to a ‘0’ in the address,

while leaving it ‘Off’ or ‘Open’ corresponds to a ‘1’.

Refer to Appendix A for common address contentions.

OMG-ISO-COMM Page 2

Card Setup

Port Enable / Disable

Each port on the OMG-ISO-COMM can be enabled or disabled with switch
position 8 on the DIP-switch. The port is enabled with the switch ‘On’ or
‘Closed’ and disabled when ‘Off’ or ‘Open’. If any port is disabled, be sure to
disable the interrupt request for that port by removing the IRQ jumper.

IRQ Selection

Headers E1, E2, E3 and E4 select the IRQ for each serial port. If COM1: is
selected, this jumper must be on the IRQ4 setting. If COM2: is selected, this
jumper must be on IRQ3.

E4 - Port1

23457

23457

23457

23457

101112

101112

101112

101112

15

E3 - Port2

15

E2 - Port3

15

E1 - Port4

15

Figure 3 - Headers E1, E2, E3, and E4 (Factory Default)

Note: Most communications software applications default COM3: to IRQ4 and

COM4: to IRQ3. This requires the sharing of interrupts between COM1:
and COM3:, and between COM2: and COM4:. While this is the default, it
is not always the preferred setting. Check your software configuration
instructions to determine the most appropriate IRQ selection.

OMG-ISO-COMM Page 3

Card Setup

MSNMS

N

1

2

3

4

MSNMS

N

E5

3

4

Interrupt Mode Options

Header E5 selects the interrupt mode for each port. Each port must be set in the
correct mode to insure proper installation.

‘N’ indicates the (N)ormal, single interrupt per port mode. ‘S’ Indicates the
(S)hared interrupt mode, which allows more than one port to access a single IRQ.
Any two or more ports can share a common IRQ by placing the jumpers on the
same IRQ setting, and setting the appropriate selections at E5. Consult your
particular software for IRQ selection. If no interrupt is desired, remove the
jumper. ‘M’ indicates the inclusion of a 1K ohm pull-down resistor required on
one port when sharing interrupts.

E5

Figure 4 - Header E5, Normal IRQ Mode

Set jumpers to ‘S’ for shared interrupt mode on all blocks sharing an IRQ except
one. Set that port block for ‘M ’. This provides the pull-down resistor circuit that
makes sharing of IRQs possible. If you are using more than one OMG-ISO-
COMM or a compatible card in a bus you should only have one port set to ‘M ’.
The following example shows all four ports sharing a single IRQ.

1 2

Figure 5 - Header E5, Shared IRQ Mode

OMG-ISO-COMM Page 4