User`s guide

Hardware Installation • 21
2.2.14 COM2 Serial Ports (RS-232/422/485, DB-9)
Pin # RS-232 RS-422 RS-485
1 DCD, Data carrier detect TX- DATA-
2 RXD, Receive data TX+ DATA+
3 TXD, Transmit data RX+ NC
4 DTR, Data terminal ready RX- NC
5 GND, ground GND GND
6 DSR, Data set ready NC NC
7 RTS, Request to send NC NC
8 CTS, Clear to send NC NC
9 RI, Ring indicator NC NC
2.2.15 COM2 Serial Ports (RS-232/422/485, Pin Headers)
Pin # RS-232 RS-422 RS-485
1 DCD, Data carrier detect TX- DATA-
2 RXD, Receive data TX+ DATA+
3 TXD, Transmit data RX+ NC
4 DTR, Data terminal ready RX- NC
5 GND, ground GND GND
6 DSR, Data set ready NC NC
7 RTS, Request to send NC NC
8 CTS, Clear to send NC NC
9 RI, Ring indicator NC NC
10 NC NC NC
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