Symetrix AXIOMTEK 10.4 Touch Panel PC - Manual (Page 19)

GOT-5100TL User’s Manual
Hardware Installation 11
When COM1 is set to RS-422 or RS-485, the pin assignments are
listed below:
Signal Name
Pin #
RS-422 RS-485
1 TX- DATA-
2 TX+ DATA+
3 RX+ No connector
4 RX- No connector
5 No connector No connector
6 No connector No connector
7 No connector No connector
8 No connector No connector
9 GND GND
COM2 COM1