Omega Engineering OMG-CONV-485-ISO User Manuals

Table of Contents

• INTRODUCTION

  1
• OVERVIEW

  1
• W HAT ’S INCLUDED

  1
• FACTORY DEFAULT SETTINGS

  1
• CARD SETUP

  2
• RS-485 ENABLE M ODES

  2
• LINE TERMINATION AND RECEIVER ECHO OFF/ON

  4
• OPERATING SYSTEM INSTALLATION (FOR WINDOWS USERS)

  6
• Installation

  6
• RS-485 Two-Wire and RS-485 Four-Wire Slave Installation

  7
• Other Operating Systems

  8
• SYSTEM INSTALLATION

  9
• TECHNICAL DESCRIPTION

  10
• CONNECTOR PIN A SSIGNMENTS

  10
• RS-232 Signals (DB-25 Female)

  10
• RS-422/485 Pin Assignments (6 Position Screw Terminal)

  10
• SPECIFICATIONS

  11
• ENVIRONMENTAL SPECIFICATIONS

  11
• M ANUFACTURING

  11
• M EAN TIME BETWEEN FAILURES (MTBF)

  11
• PHYSICAL DIMENSIONS

  11
• APPENDIX A - TROUBLESHOOTING

  12
• APPENDIX B - HOW TO GET ASSISTANCE

  13
• APPENDIX C - ELECTRICAL INTERFACE

  14
• RS-232

  14
• RS-422

  14
• RS-485

  15
• APPENDIX D - GROUND LOOP PHENOMENON

  16
• 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

  19
• Figure 1- Dip switch SW1, RS-422

  3
• Figure 2 – Dip switch SW1, RS-485 ‘Auto’ Enable

  3
• Figure 3 – Dip switch SW1, RS-485 ‘RTS’ Enable

  3
• Figure 4 – Dip switch SW1, RS-485 ‘Data’ Enable

  3
• Figure 5 – Dip switch SW2, Line Termination and Echo Off/On

  4
• Figure 6 – RS-422 with Termination and Receiver Echo

  5
• Figure 7 – RS-485 2-wire with Termination and Receiver No Echo

  5
• Figure 8 – RS-485 2-wire no Termination and Receiver No Echo

  5
• Figure 9 – OMG-CONV-485-ISOI cabling example

  16
• Figure 9 - Asynchronous Communications Bit Diagram

  17