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Pin
1
2
3
4
5
6
7
8
9
The connector supports up to three independent serial communication channels and
can be configured for RS-232 and RS-422 or 2×RS-485.
Pin
1
2
3
4
5
6
7
8
9
The connector supports up to two independent serial communication channels and can
be configured for RS-232 and RS-422 or RS-485.
Beijer Electronics, MAEN332
COM-A
Serial port pin assignment
COM 1
RS422 TX+ or
RS485 Tx+/Rx+
RS232 RxD
RS232 TxD
RS422 RX+
GND
RS422 TX- or
RS485 Tx-/Rx-
RS232 RTS
RS232 CTS
RS422 RX-
COM-B
Serial port pin assignment
COM 4
RS422 TX+ or
RS485 Tx+/Rx+
RS232 RxD
RS232 TxD
RS422 RX+
GND
RS422 TX- or
RS485 Tx-/Rx-
RS232 RTS
RS232 CTS
RS422 RX-
Operator Panel Drawings
COM 3
COM 2
RS485 Tx+/Rx+
GND
GND
RS485 Tx+/Rx-
COM 5
GND
16
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