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Omega Engineering OMG-CONV-485-ISO manual

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Table of contents for the manual

  • Page 1

    www .omega.com e-mail: info@omega.com U ser ’ s Guide OMG-CON V -485-IS O Isolated RS-232 to RS-422/485 Conver ter Shop online at[...]

  • Page 2

    Servicing Nor th 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: Sale[...]

  • Page 3

    Contents INTRODUCTION .......................................................................................................... 1 O VERVIEW ................................................................................................................... 1 W HAT ’ S I NCLUDED .....................................................................[...]

  • Page 4

    APPENDIX F - SILK - SC REEN ................................................................................. 18 APPEND IX G - COMPLIANCE NO TICES ............................................................. 19 F EDERAL C OMMUNICATIONS C OMMISSION S TATEMENT ............................... 19 EMC D IRECTIVE S TATEMENT .............................[...]

  • Page 5

    Introduction OMG - CONV - 485 - ISO Page 1 Introduction Overview The OMG - CONV - 485 - ISO is a single channel RS - 232 to RS - 422/485 asynchronous converter. It provides one field selectable RS-422/485 serial port supporting asynchronous data rates up to 115.2K bps. The OMG - CONV - 485 - ISO is self - powered allowing it to correctly drive mult[...]

  • Page 6

    Card Setup OMG - CONV - 485 - ISO Page 2 Card Setup RS - 485 Enable Modes RS - 485 is ideal for multi - drop or network environments. RS - 485 requires a tri - state driver that will allow the electrical presence of the driver to be removed from the line. The driver is in a tri - state or high impedance condition when this occurs. Only one driver m[...]

  • Page 7

    Card Setup OMG - CONV - 485 - ISO Page 3 Communication Mode Examples (Dip switch SW1) ON 1 2 OFF Figure 1 - Dip switch SW1, RS - 422 ON 1 2 OFF Figure 2 – Dip switch SW1, RS - 485 ‘Auto’ Enable ON 1 2 OFF Figure 3 – Dip switch SW1, RS - 485 ‘RTS’ Enable ON 1 2 OFF Figure 4 – Dip switch SW1, RS - 485 ‘Data’ Enable[...]

  • Page 8

    Card Setup OMG - CONV - 485 - ISO Page 4 Line Termination and Receiver Echo Off/On Typically, each end of the RS - 485 bus must have a line - terminating resistor (RS - 422 terminates at the receive end only). A 120 - ohm resistor is across each RS - 422/485 input in addition to a 1K - ohm pull - up/pull - down combination that biases the receiver [...]

  • Page 9

    Card Setup OMG - CONV - 485 - ISO Page 5 Electrical Interface Examples (Dip switch SW2) ON 1 2 OFF 3 4 5 6 Figure 6 – RS - 422 with Termination and Receiver Echo ON 1 2 OFF 3 4 5 6 Figure 7 – RS - 485 2 - wire with Termination and Receiver No Echo ON 1 2 OFF 3 4 5 6 Figure 8 – RS - 485 2 - wire no Termination and Receiver No Echo[...]

  • Page 10

    Installation OMG - CONV - 485 - ISO Page 6 Operating System Installation (For Windows Users) RS - 422/RS - 485 Four Wire Master/RS - 485 Two Wire Auto Mode Installation If your application is 4 - wire Full Duplex RS - 422 or 4 - Wire RS - 485 Master, where control of the transmitter is not required, or 2 - wire RS - 485 and you intend to use the Au[...]

  • Page 11

    Installation OMG - CONV - 485 - ISO Page 7 RS - 485 Two - Wire and RS - 485 Four - W ire Slave Installation If your application is 2 - wire Half - Duplex RS - 485 or 4 - Wire Full - Duplex RS - 485 Slave that requires control of the transmitter, the OMG - CONV - 485 - ISO provides 3 methods of control. The first method is ‘Auto Enable’ which us[...]

  • Page 12

    Installation OMG - CONV - 485 - ISO Page 8 Once the software installation is complete, the port must be configured for ‘ RTS Enable ’. This is accomplished by using the Device Manager in Windows 9X, ME, and Windows 2000. The port that the OMG - CONV - 485 - ISO is attached must be selected under Ports (COM & LPT) . Access the ‘ RTS Enable[...]

  • Page 13

    Installation OMG - CONV - 485 - ISO Page 9 System Installation The OMG - CONV - 485 - ISO can be connected to any existing RS - 232 port. A cable such as the CA - 177 can be used to attach the OMG - CONV - 485 - ISO DB - 25F to the PC’s DB - 9M connector. 1. Locate an existing RS - 232 COM: port and co nnect the OMG - CONV - 485 - ISO. 2. With th[...]

  • Page 14

    Technical Description OMG - CONV - 485 - ISO Page 10 Technical Description The OMG - CONV - 485 - ISO converts an existing RS - 232 serial port into a field selectable RS - 422/485 port for industrial automation and control applications. Connector Pin Assignments R S - 232 Signals (DB - 25 Female) Signal Name Pin # Mode GND Ground 7 RD Receive Data[...]

  • Page 15

    Specifications OMG - CONV - 485 - ISO Page 11 Specifications Environmental Specifications Specification Operating Storage Temperature Range 0º to 50º C (32º to 122º F) - 20º to 70º C (- 4º to 158º F) Humidity Range 10 to 90% R.H. Non - Condensing 10 to 90% R.H. Non - Condensing Manufacturing • All Printed Circuit boards are built to U. L.[...]

  • Page 16

    Appendix A - Troubleshooting OMG - CONV - 485 - ISO Page 12 Appendix A - Troubleshooting Serial Utility test software is supplied wit h 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. The OMG[...]

  • Page 17

    Appendix B - How To Get Assistance OMG - CONV - 485 - ISO Page 13 Appendix B - How To Get Assistance Please refer to Appendix A - Troubleshooting prior to calling Technical Support. 1. Read this manual thoroughly before attempting to install the adapter in your system. 2. When calling for technica l assistance, please have your user manual and curr[...]

  • Page 18

    Appendix C – Electrical Interface OMG - CONV - 485 - ISO Page 14 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 th e RS - 232 port on [...]

  • Page 19

    Appendix C – Electrical Interface OMG - CONV - 485 - ISO Page 15 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 [...]

  • Page 20

    Appendix D – Ground Loop Phenomenon OMG - CONV - 485 - ISO Page 16 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 exp[...]

  • Page 21

    Appendix E - Asynchronous Communications OMG - CONV - 485 - ISO Page 17 Appendix E - Asynchronous Communicat ions 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 [...]

  • Page 22

    Appendix F - Silk - Screen OMG - CONV - 485 - ISO Page 18 Appendix F - Silk - Screen 2.688 in 2.078 in[...]

  • Page 23

    Appendix G - Compliance Notices OMG - CONV - 485 - ISO Page 19 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, pursua nt to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harm[...]

  • Page 24

    W ARRANTY / DISCLAIMER OME GA ENGINEERING, INC. war rants this unit to be free of defects in materials and workmanship for a period of 1 3 months from date of purc hase. OM E G A ’ s W ARRAN TY adds an additional one (1) month grace period to the normal one (1) year pr oduct warranty to cover handling and shipping time. This ensures that OME GA ?[...]

  • Page 25

    M 3 88 8 /0303 Where Do I Find Ever ything I Need for Pr ocess Measurement and Control? OM EGA…Of Course! Shop online at www .omega.com TEMPERA TURE   Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies   Wire: Thermocouple, RTD & Thermistor   Calibrators & Ice Point References   Recorder[...]