Connector Assignments
6.3 4x RS-422 Asynchronous Interface or RS485
For usage of the RS485 interface, the RS-422 signal lines have to be connected via an external
adapter as described below.
Device connector:
37-pin DSUB connector, female
Pin Position:
Pin Assignment:
Port
Signal
RS-485
Signal
RS-422
Pin
Signal
RS-422
Signal
RS-485
COM1
Rx/Tx+
connect externally
TX+ (A)
1
20 TX- (B)
n.c.
RX+ (A)
2
21 RX- (B)
Rx/Tx-
connect externally
RTS+ (A)
3
22 RTS- (B)
n.c.
CTS+ (A)
4
23 CTS- (B)
(reference potential)
GND
5
24 TX+ (A)
Rx/Tx+
connect externally
COM2
n.c.
TX- (B)
6
25 RX+ (A)
RX- (B)
7
26 RTS+ (A)
Rx/Tx-
connect externally
n.c.
RTS- (B)
8
27 CTS+ (A)
CTS- (B)
9
28 GND
(reference potential)
COM3
Rx/Tx+
connect externally
TX+ (A) 10
29 TX- (B)
n.c.
RX+ (A) 11
30 RX- (B)
Rx/Tx-
connect externally
RTS+ (A) 12
31 RTS- (B)
n.c.
CTS+ (A) 13
32 CTS- (B)
(reference potential)
GND 14
33 TX+ (A)
Rx/Tx+
connect externally
COM4
n.c.
TX- (B) 15
34 RX+ (A)
RX- (B) 16
35 RTS+ (A)
Rx/Tx-
connect externally
n.c.
RTS- (B) 17
36 CTS+ (A)
CTS- (B) 18
37 GND
(reference potential)
-
n.c. 19
Shield S
Signal Description:
Rx+/-, Tx+/-,
RTS+/-, CTS+/-...
RS-422 signal lines of the corresponding COM port
Rx/Tx+, Rx/Tx-
RS-485 signal lines of the corresponding COM port
Shield ...
shielding (connected with the case of the 37-pin DSUB connector)
n.c. ...
not connected
Page 16 of 17
Hardware Manual • Doc. No.: I.2328.21 / Rev. 1.0
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