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W&T The serial combi-port
5�1 Overview
Com-Server comes standard with an RS232/422/485 combi-
port whose modes are described below.
All external signal lines use ESD-immune interface compon-
ents to provide protection against static discharges of up to
15kV per IEC 801-2, Level 4.
5�1�1 Opening the Com-Server
To open the Com-Server, plug the DB9 connector into the seri-
al port. After tightening the two mounting screws, pull on the
DB9 plug to remove the circuit board from the housing..
5�1�2 Mode selection
Switching between the modes is accomplished using the inter-
nal DIL switches located on the respective interface module.
The following table shows an overview of all modes:
Mode SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8
RS232 (*) OFF OFF OFF OFF OFF OFF OFF ON
RS422, RS485
4-wire-bus-master
OFF OFF OFF OFF ON Term. OFF
RS485 4-wire
automatic control
OFF ON OFF OFF ON Term. OFF
RS485 2-wire
automatic control
ON ON OFF OFF OFF Term. OFF
(*) Factory default
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