Aaeon PCM-4335 Manual page 21

RS-232 connector (CN3/COM1)
The following table shows the pin assignments for the card's RS-
232 port:
RS-232 connector (CN3/COM1)
Pin
1
2
3
4
5
6
7
8
9
10
RS-232/422/485 connector (CN8/COM2)
RS-232/422/485 connector (CN8/COM2)
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Signal
DCD
DSR
RX
RTS
TX
CTS
DTR
RI
GND
NC
Signal
DCD
DSR
RX
RTS
TX
CTS
DTR
RI
GND
NC
B485TXD+
B485TXD-
B422RXD+
B422RXD-
Chapter 2 Installation 13