Advantech PCM-9570/S 2006957006 5th Edition User Manual
Page 113
Appendix C Pin Assignments
101
Table C-19: COM2 port for RS-232, RS-422 and RS-485 (CN20)
Pin
Signal
RS-232
RS-422
RS-485
11
DCD2
TX-
DATA-
13
RxD2
TX+
DATA+
15
TxD2
RX+
NC
17
DTR2
RX-
NC
19
GND
GND
GND
12
DSR2
DSR2 (not used)
DSR2 (not used)
14
RTS2
RTS2 (not used)
DSR2 (not used)
16
CTS2
CTS2 (not used)
DSR2 (not used)
18
RI2
RI2 (not used)
DSR2 (not used)