Advantech TREK-674 Manual page 20

3.5 RS-232 Connector
RS-232 Connector
Pin Signal
1 RS-232 DCD
3 RS-232 TXD
RS-232 Ground
5
RS-232 RTS
7
RS-232 RI / +5V / +V12
9
Pin Signal
2 RS-232 RXD
4 RS-232 DTR
6 RS-232 DSR
8 RS-232 CTS