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Table of Contents
COM128 FEATURES ................................................................................................. 1
1 INTRODUCTION ........................................................................................................ 2
2 Physical Features ..................................................................................................... 3
2.1 RS-232 Panel ............................................................................................................. 3
2.2 RS-485 Panel ............................................................................................................. 3
3 CONFIGURATION ...................................................................................................... 4
3.1 Configuration Switches ............................................................................................... 4
3.2 Mode Descriptions ...................................................................................................... 4
3.2.1 RS-485 Flow Control ................................................................................... 4
3.2.2 Speed Compensation ................................................................................. 5
3.2.3 RTS / CTS Flow Control ............................................................................. 5
3.2.4 RS-485 Data Buffering ................................................................................ 6
3.2.5 Repeater ..................................................................................................... 6
4 INSTALLATION ......................................................................................................... 7
4.1 DC Supply Connections .............................................................................................. 7
4.2 RS-232 Connection & Configuration ........................................................................... 7
4.2.1 RS-232 Cable ............................................................................................. 7
4.2.2 Direct Connection to a Computer ................................................................ 7
4.2.3 Connection to a Modem .............................................................................. 8
4.3 RS-485 Bus Connections ........................................................................................... 9
4.3.1 Convertor Connections ............................................................................... 9
4.3.2 General Bus Wiring Considerations ............................................................ 9
4.3.3 Recommended Topologies ......................................................................... 9
5 SUPPLYING POWER TO THE RS-232 DTR PIN .................................................... 11
6 TECHNICAL SPECIFICATIONS .............................................................................. 13
7 COM128 OPTIONS .................................................................................................. 14
7.1 -UNI Option .............................................................................................................. 14
7.2 -IND Option .............................................................................................................. 14