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C2904M-B (2/05) 13
PIN ASSIGNMENTS
Pin
COM1 COM2
RS-232 RS-232/485 RS-232
1 DCD – –
(data carrier detect)
2 RxD RxD+ RxD
(receive data) (receive data plus) (receive data)
3 TxD TxD- TxD
(transmit data) (transmit data minus) (transmit data)
4 DTR – –
(data terminal ready)
5 GND (ground) GND (ground) GND (ground)
6 DSR – –
(data set ready)
7 RTS TxD+ –
(ready to send) (transmit data plus)
8 CTS RxD- –
(clear to send) (receiver data minus)
9 –––
1 2 3 4 5
6 7 8 9