THOMSON REMOTE COMMUNICATION - V3.0 User Manual page 18

SECTION 1
10.6.2. RS-485/-422 Connection
PM055 Rev 2 00/08/31
The following hardware configuration is required for 4 wire RS-
485/-422 from the port 2 on the CIM to an RS-232 port on a
computer:
The following parts are connected in order from the RS-232 side
(computer) to the RS-485/-422 side (the CIM).
RS-232 to RS-485 or RS-422 adapter (set to DCE)
DB-25 to RJ45 adapter (or custom cable) for RS-422/-485 on the
CIM port 2(see below wiring).
Insure that the correct handshaking signals are connected on the
RS-232 side of the RS-485/-422 converter. Many RS-485
converters use the RTS line to control the transmitter (which must
be tri-stated during receive mode). It is important to insure that the
converter is configured correctly and the correct handshaking lines
are wiring appropriately. If the handshaking lines (RTS) are not
wired correctly the connection may appear to work but damage
may occur and communications may be unreliable over time.
DB-25 from RS-422 converter
Signal
TXB+
TXA-
RXA-
RXB+
GND (optional)
12
COMMUNICATION INTERFACE MODULE
Pin
14
2
5
17
7
CIM Port 2
Pin Signal
1 RXB+
2 RXA-
3 TXA-
4 TXB+
5 GND
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