Omega OMG-COMM8-A User Manual
Contents
INTRODUCTION .....................................................................1
OVERVIEW .................................................................................1
WHAT’S INCLUDED..................................................................... 1
FACTORY DEFAULT SETTINGS.....................................................1
CARD SETUP..........................................................................3
ADDRESS SELECTION..................................................................3
“PAL” ADDRESSING...................................................................4
IRQ SELECTION..........................................................................5
INTERRUPT MODE OPTIONS.........................................................6
INSTALLATION ......................................................................8
OPERATING SYSTEM INSTALLATION ............................................8
Windows 3.x, Windows 95, Windows NT................................8
OS/2........................................................................................8
QNX.......................................................................................8
TECHNICAL DESCRIPTION.....................................................9
FEATURES ..................................................................................9
INTERRUPT STATUS PORT............................................................9
DB-25 CONNECTOR PIN ASSIGNMENTS ..................................... 10
DB-78 CONNECTOR PIN ASSIGNMENTS ..................................... 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
APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ...........16
APPENDIX E - 3421 ADDENDUM..........................................17
APPENDIX F - SILK-SCREEN..................................................1
APPENDIX G - COMPLIANCE NOTICES................................ 19
FEDERAL COMMUNICATIONS COMMISSION STATEMENT.............19
EMC DIRECTIVE STATEMENT ...................................................19
WARRANTY.........................................................................20
Figures
Figure 1 - Address Selection Table........................................................3
Figure 2 - DIP-switch Illustration ..........................................................4
Figure 3 - Headers E1 to E8 (IRQ15 selected) .......................................5
Figure 4 - Header E9 and E10, Normal IRQ Mode ...............................6
Figure 5 - Header E9 and E10, Shared IRQ Mode................................7
Figure 6 - Header E9 and E10, Sharing IRQ’s with another adapter...7
Figure 7 - DB-25 Connector Pin Assignments.....................................10
Figure 8 - DB-78 Connector Pin Assignments.....................................10
Figure 9 - Asynchronous Communications Bit Diagram ....................16
©1997h Omega Engineering, Incorporated. All rights reserved.
Introduction
Introduction
Overview
The Omega Engineering OMG-COMM8-A provides the PC with eight
RS-232 asynchronous ports. The OMG-COMM8-A allows for connection
to any device utilizing the RS-232 electrical interface, such as modems,
data-entry terminals, and plotters.
What’s Included
The OMG-COMM8-A is shipped with the following items. If any of these
items are missing or damaged, contact the supplier.
• OMG-COMM8-A Serial I/O Adapter
• “Octopus” Cable providing 8 DB-25 connectors.
• 3.5″ Serial Utility Diskette
• User Manual
Factory Default Settings
The OMG-COMM8-A factory default settings are as follows:
Port # Base Address IRQ
Port 1 280 2/9
Port 2 288 3
Port 3 290 4
Port 4 298 5
Port 5 2A0 2/9
Port 6 2A8 3
Port 7 2B0 4
Port 8 2B8 5
Omega Engineering OMG-COMM8-A Page 1
Introduction
To install the OMG-COMM8-A using factory default settings, refer to the
Installation section of this manual.
For your reference, record installed OMG-COMM8-A settings below:
Port # Base Address IRQ
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
Port 7
Port 8
The following table shows which port is connected to which connector and
the corresponding address in the Factory Default setting.
Port # DB-25# Address Example
1 1 Base+0 280-287
2 2 Base+8 288-28F
3 3 Base+16 290-297
4 4 Base+24 298-29F
5 5 Base+32 2A0-2A7
6 6 Base+40 2A8-2AF
7 7 Base+48 2B0-2B7
8 8 Base+56 2B8-2BF
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Card Setup
Card Setup
The OMG-COMM8-A contains several jumper straps that must be set for
proper operation.
Address Selection
The OMG-COMM8-A occupies 64 I/O locations and can be addressed
two different ways. If header E1 is set to the “Switch” position the OMG-
COMM8-A occupies 64 consecutive I/O locations and the DIP-switch is
used to set the base address for these locations. The starting address for
these 64 I/O locations must be on a 64-byte boundary i.e.: Hex 200, 240,
280, or 2C0. Be careful when selecting the base address as some selections
conflict with existing PC ports. The following table shows several
examples that usually do not cause a conflict.
Address Switch Position Setting:
1 2 3 4 5 6 7
100-13F On On On On Off On On
180-1BF On On On On Off Off On
240-27F On On On Off On On Off
280-2BF On On On Off On Off On
2C0-2FF On On On Off On Off Off
300-3FF On On On Off Off On On
500-53F On On Off On Off On On
580-5BF On On Off On Off Off On
1500-153F Off On Off On Off On On
1580-15BF Off On Off On Off Off On
Figure 1 - Address Selection Table
Note: Some of these selections may not be valid for your system, due to
port contention. If in doubt, call Sealevel Technical Support
(864) 843-4343 for assistance. These addressing restrictions are
simplified when using the “PAL” option.
Note: If Xenix is the operating system and COM1 is not installed, use base
address 500 Hex and IRQ 4 (Xenix COM1:). If COM1: is installed,
then select 580 Hex as a base address and IRQ 3 (Xenix COM2:).
Omega Engineering OMG-COMM8-A Page 3
Card Setup
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 280 (Factory Default) is selected as a base.
A12 A6
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.
“PAL” Addressing
If header E11 is set to the “PAL” position, the board can be addressed at
many customized locations. Using the “PAL” option will allow you to
obtain COM1: - COM4: addresses, XENIX COM: addresses, or any other
standard or nonstandard address configuration. Using the “PAL” feature is
a very cost-effective means of solving complex addressing problems. For
more information on implementing the “PAL” option, please contact
Omega Engineering Technical Support.
Omega Engineering OMG-COMM8-A Page 4
Card Setup
IRQ Selection
The OMG-COMM8-A has an interrupt selection jumper that corresponds
to each port that may have to be set prior to use. The software you are
using with the board will determine which interrupts, if any are to be used.
The DOS serial port interface software does not use interrupts, while
interrupt buffer programs do. DOS does not require the interrupt to be set,
while most Multi - User Operating Systems will. Consult the particular
manual for the software that you are using to determine the proper setting.
To set the interrupt for a particular port, first select the header for the port
desired. Headers E1-E8 correspond to Ports 1-8. Next select an IRQ by
placing one of the jumpers on the header location that corresponds to the
IRQ number that you wish to use. Below is an example of a selected IRQ.
2 3 4 5 6 7 10 11 12 15
Figure 3 - Headers E1 to E8 (IRQ15 selected)
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