Advantech PENTIUM PPC-150 - Manual (Page 185)

Appendix D Pin Assignments 169
COM2
Table D-20: COM2
Pin Signal
RS-232
RS-422 RS-485
1 DCD TX- DATA-
2 RX TX+ DATA+
3 TX RX+ ---
4 DTR RX- ---
5 GND GND ---
6 DSR --- ---
7 RTS --- ---
8 CTS --- ---
9 RI --- ---
1 5
9 6
6 7 8 9
5 4 3 2 1