System manual CECX / Serial option module CECX-S-S4
CECX-II 32-9
32.5.2.2 Pin assignment
RS-422-A RS-485-A
1
5
9
6
n.c.
TERM A
A'
A
GND
TERM B
B'
B
GND
1
5
9
6
n.c.
TERM A
A/A'
do not connect
GND
TERM B
B/B'
do not connect
GND
n.c.: not connected
Assignment RS-422-A/RS-485-A, DSUB-plug connection seen from front
RS-422-A:
PIN-No. Signal designation Input / Output
9 A Transmit - Output
8 A' Receive - Input
4 B Transmit + Output
3 B' Receive + Input
7 TERM A Terminating resistor ---
2 TERM B Terminating resistor ---
1 GND Ground ---
5 GND Ground ---
RS-485-A:
PIN-No. Signal designation Input / Output
8 A / A' Transmit / receive - Input or Output
3 B / B' Transmit / receive + Input or Output
7 TERM A Terminating resistor ---
2 TERM B Terminating resistor ---
1 GND Ground ---
5 GND Ground ---
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