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8. Pin-out of COM Ports
DB-9 Male Connector
PIN#
COM1
[RS-232]
1
NC
*1
2
RX
3
TX
4
NC
5
GND
6
NC
7
RTS
8
CTS
9
NC
*1 NC:
No
Connection
Pluggable Terminal Block
PIN#
COM3
[RS-422]
COM3
[RS-485]
COM4
[RS-485]
1
NC
NC
DATA+
2
NC
NC
DATA-
3
ISO_GND
ISO_GND
ISO_GND
4
RX+
NC
NC
5
RX-
NC
NC
6
TX+
DATA+
NC
7
TX-
DATA-
NC
1
2
3
4
5
6
7
7