Omega OMG-COMM2-EX User Manual

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User’s Guide

OMG-COMM2-EX

Dual Port ISA RS-232/422/485 Interface Board

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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

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

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

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

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

INTERFACE SELECTION.........................................................................3

RS-422/485............................................................................................3

RS-232....................................................................................................3

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

INTERRUPT MODES................................................................................4

HEADERS E3 AND E4...............................................................................5

INSTALLATION ..........................................................................6

OPERATING SYSTEM INSTALLATION ................................................. 6

For Windows Users ............................................................................6

Other Operating Systems ...................................................................6

TECHNICAL DESCRIPTION.........................................................7

FEATURES ................................................................................................ 7

MODEM CONTROL SIGNAL CONSIDERATIONS..................................7

LINE TERMINATION ............................................................................... 7

CONNECTOR PIN ASSIGNMENTS..........................................................8

RS-232 (Male DB9)..............................................................................8

RS-422/485 (Male DB9).......................................................................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 - SILK-SCREEN ....................................................15

APPENDIX F - COMPLIANCE NOTICES ...................................16

FEDERAL COMMUNICATIONS COMMISSION STATEMENT............ 16

EMC DIRECTIVE STATEMENT........................................................... 16

Figures

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

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

Figure 3 - Header E1 and E2, IRQ Selection.....................................................3

Figure 4 - Headers E9 and E10, Normal IRQ Mode .........................................4

Figure 5 - Headers E9 and E10, Shared IRQ Mode..........................................4

Figure 6 - Headers E9 and E10, Sharing IRQ’s with another adapter.........5

Figure 7 - Asynchronous Communications Bit Diagram.............................14

Introduction

Introduction

Overview

The OMG-COMM2-EX provides the PC with 2 asynchronous serial ports
providing a versatile interface field selectable as RS-232 for modems, printers and
plotters, as well as RS-422/485 for industrial automation and control applications.

What’s Included

The OMG-COMM2-EX is shipped with the following items. If any of these items
are missing or damaged, contact the supplier.

• OMG-COMM2-EX Serial I/O Adapter

• Software

Factory Default Settings

The OMG-COMM2-EX factory default settings are as follows:

Port # Base Address IRQ Electrical Interface

Port 1 280 5 RS-422
Port 2 288 10 RS-422

To install the OMG-COMM2-EX using factory default settings, refer to
Installation on page 6.

For your reference, record installed OMG-COMM2-EX settings below:

Port # Base Address IRQ Electrical Interface

OMG-COMM2-EX Page 1

Card Setup

Card Setup

The OMG-COMM2-EX contains several jumper straps which must be set for
proper operation.

Address Selection

Each port on the OMG-COMM2-EX occupies eight 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.
SW1 sets the I/O address for port 1 of the OMG-COMM2-EX and SW2 sets the
address for port 2.

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.

ENA3A9

ON

1 2 3 4 5 6 7 8

Figure 2 - DIP-Switch Illustration

Note: Setting the switch ‘On’ or ‘Clo sed’ 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-COMM2-EX Page 2

Card Setup

Port Enable / Disable

Each port on the OMG-COMM2-EX 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.

Interface Selection
RS-422/485

To select the RS-422/485 mode of operation install dip shunts in sockets found at
E6 and E7. E6 sets Port 1 and E7 sets Port 2.

RS-232

To select the RS-232 mode of operation install dip shunts in sockets found at E5
and E8. E5 sets Port 1 and E8 sets Port 2.

IRQ Selection

Headers E1 and E2 select the interrupt request for each serial port (E1 - Port 2, E2

- Port 1). If COM1: is selected, the corresponding jumper must be on the IRQ4
setting. If COM2: is selected, the corresponding jumper must be on IRQ3.

E1

2/9 3 4 5 7 10 11 12 15

E2

2/9 3 4 5 7 10 11 12 15

Figure 3 - Header E1 and E2, IRQ Selection

Any two or more ports can share a common IRQ, provided a polling driver is
used, by placing the jumpers on the same IRQ setting and setting the appropriate
selections at E3. The following examples show the setup if a polling driver is
used. NOTE: Windows does not provide a polling driver. Consult your particular
software for IRQ selection. If no interrupt is desired, remove the jumper.

OMG-COMM2-EX Page 3