Related Manuals for Omega Engineering ISA RS-422
Summary of Contents for Omega Engineering ISA RS-422
- Page 1 User’ s Guide Shop online at www.omega.com e-mail: info@omega.com OMG-ULTRA-SIO Dual Port Isolated/Non-Isolated ISA RS-422/485 Adaptor Board...
- Page 2 OMEGAnet Online Service ® www.omega.com Servicing North America: USA: One Omega Drive, P.O. Box 4047 Stamford CT 06907-0047 ISO 9001 Certified TEL: (203) 359-1660 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L 5A1, Canada TEL: (514) 856-6928 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 / 1-800-622-BEST...
-
Page 3: Table Of Contents
...1 NTRODUCTION ... 1 VERVIEW ’ ... 1 NCLUDED ACTORY EFAULT ETTINGS ...2 ETUP ... 2 DDRESS ELECTION NABLE ISABLE IRQ S ... 3 ELECTION ... 4 NTERRUPT ODES RS-485 E ... 5 NABLE ODES NTERFACE XAMPLES ... 8 ERMINATION ...9 NSTALLATION ... - Page 4 ? ... 16 HAT IS ROUND ABLING ECOMMENDATIONS E - A PPENDIX SYNCHRONOUS F - S ...18 PPENDIX CREEN G - C PPENDIX OMPLIANCE EDERAL OMMUNICATIONS EMC D IRECTIVE TATEMENT Figure 1 - Address Selection Table ...2 Figure 2 - Header E11 and E12, IRQ Selection ...3 Figure 3 - Header E5 &...
-
Page 5: Introduction
Introduction Overview The OMG-ULTRA-SIO provides the PC with two additional ground isolated RS- 422/485 (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. -
Page 6: 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. -
Page 7: Irq Selection
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. Note: Most communications software applications default COM3: to IRQ4 and COM4: to IRQ3. -
Page 8: Interrupt Modes
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. -
Page 9: Rs-485 Enable Modes
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 pull- down resistor will prevent the ports from triggering an interrupt. - Page 10 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.
-
Page 11: Xamples
Interface Mode Examples Auto E8 & E10 Figure 6 - RS-422 Auto E8 & E10 Figure 7 - RS-485 ‘Auto’ Enabled, with ‘No Echo’ Auto E8 & E10 Figure 8 - RS-485 ‘Auto’ Enabled, with ‘Echo’ Auto E8 & E10 Figure 9 - RS-485 ‘RTS’... -
Page 12: Line Termination
Line Termination Typically, each end of the RS-485 bus must have line terminating resistors (RS- 422 terminates at the receive end only). A 120 ohm resistor is across each RS- 530/422/485 input in addition to a 1K ohm pull-up/pull-down combination that bias the receiver inputs. -
Page 13: 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. Turn off PC power. Disconnect the power cord. Remove the PC case cover. Locate an available slot and remove the blank metal slot cover. -
Page 14: Technical Description
Technical Description The OMG-ULTRA-SIO provides the PC with two additional ground isolated RS- 422/485 (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. -
Page 15: Specifications
Specifications Environmental Specifications Specification Operating Temperature Range 0º to 50º C (32º to 122º F) Humidity Range 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. -
Page 16: Appendixa - 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. - Page 17 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. 3F8-3FF is typically reserved for COM1: 2F8-2FF is typically reserved for COM2: 3E8-3EF is typically reserved for COM3: 2E8-2EF is typically reserved for COM4: OMG-ULTRA-SIO...
-
Page 18: Appendixb - How T Og
Appendix B - How To Get Assistance Please refer to Troubleshooting Guide prior to calling Technical Support. Begin by reading through the Trouble Shooting Guide in Appendix A. If assistance is still needed please see below. When calling for technical assistance, please have your user manual and current adapter settings. -
Page 19: Appendixc - Electrical
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. -
Page 20: Appendixd - Groundl
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. -
Page 21: Appendixe - Asynchronous Communications
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. -
Page 22: Appendixf - Silk -Screen
Appendix F - Silk-Screen Appendix F - Silk-Screen 4.2" 7.35" 3.9" OMG-ULTRA-SIO Page 18... -
Page 23: Appendixg - 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. - Page 24 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.
- Page 25 Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! Shop online at www.omega.com TEMPERATURE Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies Wire: Thermocouple, RTD & Thermistor Calibrators & Ice Point References Recorders, Controllers & Process Monitors Infrared Pyrometers PRESSURE, STRAIN AND FORCE Transducers &...