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Contents INTRODUCTION..........................................................................1 OVERVIEW................................................................................................ 1 W HAT ’S INCLUDED ................................................................................ 1 FACTORY DEFAULT SETTINGS ............................................................ 1 CARD SETUP ..............................................................................2 A DDRESS SELECTION.........
W HAT IS GROUND LOOP ? ................................................................... 16 CABLING RECOMMENDATIONS.......................................................... 16 APPENDIX E - ASYNCHRONOUS COMMUNICATIONS................17 APPENDIX F - SILK-SCREEN.....................................................18 APPENDIX G - COMPLIANCE NOTICES ....................................19 FEDERAL COMMUNICATIONS COMMISSION STATEMENT ............ 19 EMC DIRECTIVE STATEMENT ......................................
Introduction Introduction Overview The OMG-ULTRA-SIO provides the PC with two additional ground isolated RS422/485 (P/N 3189) or two non-isolated RS-422/485 (P/N 3089) 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.
Card Setup Card Setup The OMG-ULTRA-SIO contains several jumper straps that must be set for proper operation. Address Selection Each port on the OMG-ULTRA-SIO occupies eight consecutive I/O locations. A DIP-switch is used to set the base addres s for these locations. SW1 sets the I/O address for port 1 and SW2 sets port 2. The following table shows the addressing options available. If different address options are required, please contact Technical Support about a custom PAL option.
Card Setup IRQ Selection Headers E11 and E12 select the interrupt request for each serial port. If COM1: is selected, the corresponding jumper must be on the IRQ4 setting. If COM2: is selected, the corresponding jumper must be on IRQ3. 15 14 12 11 10 7 6 5 4 3 2/9 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:.
Card Setup Interrupt Modes Header E5 and E6 selects the interrupt mode for each port. Each port must be set in the correct mode to insure proper operation. ‘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 E1. Consult your particular software for IRQ selection.
Card Setup Set the jumper to ‘S’ if you are using more than one OMG-ULTRA-SIO in a bus or to completely remove the pull-down resistor for hardware compatibility. Setting the adapter in this configuration when it is not accompanied by a pulldown resistor will prevent the ports from triggering an interrupt. N S M 1 2 E5 E6 Figure 5 - Header E5 & E6, Sharing IRQs with another adapter RS-485 Enable Modes RS-485 is ideal for multi-drop or network environments.
Card Setup Headers E8 (Port 1) and E10 (Port 2) are used to control the RS-485 mode functions for the driver circuit. The two selections are ‘RTS’ enable or ‘Auto’ enable. The ‘Auto’ enable feature automatically enables/disables the RS-485 interface. The ‘RTS’ mode uses the ‘RTS’ modem control signal to enable the RS-485 interface and provides backward compatibility with existing software products.
Card Setup Interface Mode Examples RTS Auto E8 & E10 E3 & E9 Figure 6 - RS-422 RTS Auto E8 & E10 E3 & E9 Figure 7 - RS-485 ‘Auto’ Enabled, with ‘No Echo’ RTS Auto E8 & E10 E3 & E9 Figure 8 - RS-485 ‘Auto’ Enabled, with ‘Echo’ RTS Auto E8 & E10 E3 & E9 Figure 9 - RS-485 ‘RTS’ Enabled, with ‘No Echo’ OMG-ULTRA-SIO Page 7
Card Setup Line Termination Typically, each end of the RS-485 bus must have line terminating resistors (RS422 terminates at the receive end only). A 120 ohm resistor is across each RS530/422/485 input in addition to a 1K ohm pull-up/pull-down combination that bias the receiver inputs. Headers E1 and E4 allow the user to customize this interface to their specific requirements. Each jumper position corresponds to a specific portion of the interface.
Installation Installation System Installation The OMG-ULTRA-SIO can be installed in any of the PC expansion slots. The OMG-ULTRA-SIO contains several jumper straps for each port which must be set for proper operation. 1. 2. 3. 4. 5. 6. 7. Turn off PC power. Disconnect the power cord. Remove the PC case cover. Locate an available slot and remove the blank metal slot cover. Gently insert the OMG-ULTRA-SIO into the slot. Make sure that the adapter is seated properly. Replace the screw. Replace the cover.
Technical Description Technical Description The OMG-ULTRA-SIO provides the PC with two additional ground isolated RS422/485 (P/N 3189) or two non-isolated RS-422/485 (P/N 3089) 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.
Specifications Specifications Environmental Specifications Specification Temperature Range Humidity Range Operating 0º to 50º C (32º to 122º F) 10 to 90% R.H. Non-Condensing Storage -20º to 70º C (-4º to 158º F) 10 to 90% R.H. Non-Condensing Manufacturing • All Printed Circuit boards are built to U. L. 94V0 rating and are 100% electrically tested. These printed circuit boards are solder mask over bare copper or solder mask over tin nickel.
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.
Appendix A - Troubleshooting 8. The following are known I/O conflicts: • • • • • • The 278 and 378 settings may conflict with your printer I/O adapter. 3B0 cannot be used if a Monochrome adapter is installed.
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.
Appendix C – Electrical Interface Appendix C - Electrical Interface RS-422 The RS-422 specification defines the electrical characteristics of balanced voltage digital interface circuits. RS-422 is a differential interface that defines voltage levels and driver/receiver electrical specifications. On a differential interface, logic levels are defined by the difference in voltage between a pair of outputs or inputs.
Appendix D - Ground Loop Phenomenon Appendix D - Ground Loop Phenomenon What is Ground Loop? Ground loop Phenomenon occurs when two (or more) pieces of equipment are connected together with a common ground and a different ground potential exists at each location. This current can cause the connected equipment to experience noise that in turn causes data transmission errors. In the extreme this ground current can cause equipment malfunction or even destruction.
Appendix E - Asynchronous Communications Appendix E - 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.
Appendix F - Silk-Screen Appendix F - Silk-Screen 4.2" 7.35" 3.
Appendix G - Compliance Notices Appendix G - 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.
WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation.
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