Advantech PPC-102, Manual

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Appendix C I/O Pin Assignments 111
COM2 RS-232/422/485 serial port (CON9-4)
COM2 RS-232/422/485 serial port
RS-232 RS-422 RS-485
Pin Signal Signal Signal
1 DCD TxD- TxD- (Data-)
2 DTR RxD- RxD- (Data-)
3 RxD TxD+ TxD+ (Data+)
4 TxD RxD+ RxD+ (Data+)
5 GND GND GND
6 DSR DSR DSR
7 RTS RTS RTS
8 CTS CTS CTS
9 RI RI RI
In a typical RS-485 application, the host device requests data from a slave
module that listens for the response. The host transmits and receives data
on the same pair of wires. Software handles the flow control; no other
wires are needed. Pin assignments appear in the table. Pins 1 and 4 share
the Data- wire. Pins 2 and 3 share the Data+ wire.
J8-1 Microphone
MIC-IN
GND
J8-2 Line-in
L
GND
R