Asus PE400D Series User Manual page 14

Serial (COM) connector
The 9-pin RS232/422/485 serial (COM) connector allows you
to connect devices that have serial ports such as bar code
scanner, modem, or printers. Please refer to the table below
for the pin definitions of the different COM connectors.
14 PE400D Series
NOTE: Default set to RS-232.
1 2 3 4 5
6 7 8 9
Pin RS-232 RS-422
1
DCD# TX-
2
RXD TX+
3
TXD RX+
4 DTR RX-
5
GND GND
6
DSR NA
7
RTS NA
8
CTS NA
9
RI NA
RS485
D-
D+
NA
NA
GND
NA
NA
NA
NA