Rs-232 Connection (Com1) - Advantech PCA-6151 Manual

Serial port connections (COM1, COM2)
Connector
COM1
COM2

RS-232 connection (COM1)

Different devices implement the RS-232 standard in different
ways. If you are having problems with a serial device, be sure to
check the pin assignments for the connector. The following table
shows the pin assignments for the card's RS-232 port:
RS-232 connector pin assignments
Pin
1
2
3
4
5
6
7
8
9
18 PCA-6151 User's Manual
Function
RS-232
RS-232/422/485
Signal
DCD
RX
TX
DTR
GND
DSR
RTS
CTS
RI