Advantech PPC-103 Manual page 139

COM2
Table D-21: COM2
Pin Signal
RS-232
1 DCD
2 RX
3 TX
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
1 2 3 4 5
6 9
7 8
RS-422 RS-485
TX- DATA-
TX+ DATA+
RX+ ---
RX- ---
GND ---
--- ---
--- ---
--- ---
--- ---
Appendix C I/O Pin Assignments 123