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User’s Guide
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OMG-COMM2-EX
Dual Port ISA RS-232/422/485 Interface Board
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® OMEGAnet Online Service Internet e-mail www.omega.com info@omega.com Servicing North America: USA: One Omega Drive, P.O. Box 4047 ISO 9001 Certified Stamford CT 06907-0047 TEL: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L 5A1, Canada TEL: (514) 856-6928 FAX: (514) 856-6886 e-mail: info@omega.ca 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
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Contents INTRODUCTION..........................................................................1 OVERVIEW................................................................................................1 WHAT’S INCLUDED................................................................................1 FACTORY DEFAULT SETTINGS............................................................1 CARD SETUP..............................................................................2 ADDRESS SELE
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RS-232..................................................................................................... 12 RS-422..................................................................................................... 12 RS-485..................................................................................................... 13 APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ...............14 APPENDIX E - SILK-SCREEN ....................................................15 APPENDIX F - COMPLIANCE
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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 OM
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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-CO
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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.
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Card Setup Interrupt Modes Headers E9 and E10 select the interrupt modes for each port. Each port must be set in the correct mode to insure proper installation. E10 sets Port 1 and E9 sets Port 2 ‘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
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Card Setup Set the jumper to ‘S’ if you are using more than one OMG-COMM2-EX in a bus or you wish to completely remove the pull-down resistor for hardware compatibility. Setting the adapter in this configuration when it is not accompanied by a pull-down resistor will prevent the ports from triggering an interrupt. N S M N S M Figure 6 - Headers E9 and E10, Sharing IRQ’s with another adapter Headers E3 and E4 Position ‘A’ Determines whether the RS-485 driver is
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Installation Installation The OMG-COMM2-EX can be installed in any of the PC expansion slots, but to access the ‘AT’ or (E)ISA IRQs (10 - 15) it must be installed in one of the 16 bit slots. The OMG-COMM2-EX contains several jumper straps for each port which must be set for proper operation prior to installing the adapter into the comp uter. 1. Turn off PC power. Disconnect the power cord. 2. Remove the PC case cover. 3. Locate an available slot and remove the blank metal slot cove
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Technical Description Technical Description The OMG-COMM2-EX adapter utilizes the 16550 UART chip. This chip features programmable baud rate, data format, interrupt control and has a 16 byte transmit and receive FIFO. Features • Full independent operation of ports allowing two ports RS-232, two ports RS-422/485 or one port of each. • Addressable as COM1: - COM4: or any other I/O address up to 3FF Hex. • ‘Shareable’ IRQs allow more than one port to share a single IRQ provided the prope
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Technical Description Connector Pin Assignments RS-232 (Male DB9) Name Pin # Mode TD Transmit Data 3 Output RTS Request To Send 7 Output DTR Data Term Ready 4 Output GND Ground 5 RD Receive Data 2 Input DCD Data Carrier Detect 1 Input DSR Data Set Ready 6 Input CTS Clear To Send 8 Input RI Ring Indicator 9 Input Note: These assignments meet EIA/TIA/ANSI-574 DTE for DB-9 type connectors. RS-422/485 (Male DB9) Signal Name Pin # Mode GND Ground 5 TX + Transmit Data
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Specifications Specifications Environmental Specifications Specification Operating Storage Temperature Range 0º to 50º C -20º to 70º C (32º to 122º F) (-4º to 158º F) Humidity Range 10 to 90% R.H. 10 to 90% R.H. Non-Condensing Non-Condensing Manufacturing • IPC 610-B Class-III standards are adhered to with a 0.1 visual A.Q.L. and 100% Functional Testing. • All Printed Circuit boards are built to U.L. 94V0 rating and are 100% electrically tested. These printed circuit boards are s
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Appendix A - Troubleshooting Appendix A - Troubleshooting Serial Utility test software is supplied with the adapter and will be used in the troubleshooting procedures. By using this software and following these simple steps, most common problems can be eliminated without the need to call Technical Support. 1. Identify all I/O adapters currently installed in your system. This includes your on-board serial ports, controller cards, sound cards etc. The I/O addresses used by these adapters,
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Appendix B - How To Get Assistance Appendix B - How To Get Assistance Please refer to Troubleshooting Guide prior to calling Technical Support. 1. Begin by reading through the Trouble Shooting Guide in Appendix A. If assistance is still needed please see below. 2. When calling for technical assistance, please have your user manual and current adapter settings. If possible, please have the adapter installed in a computer ready to run diagnostics. 3. Omega Engineering maintains a Home
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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 betwe
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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 def
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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
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Appendix E - Silk-Screen Appendix E - Silk-Screen 3.9" 6.9" 4.2" OMG-COMM2-EX Page 15
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Appendix F - Compliance Notices Appendix F - Compliance Notices Federal Communications Commission Statement FCC - This equipment has been tested and found to comply with the limits for Class A 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 commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed an
