DOC ID: 16001100
Page | 12
Serial Ports
Serial port 1 can be configured for RS-232, RS-422, or RS-485 with auto flow control
communication. The default definition of COM1 is RS-232, which can be configured in
the BIOS.
The pin assignments are listed below:
Serial
Port
Pin No.
RS-232
RS-422
(5-wire)
RS-422
(9-wire)
RS-485
(3-wire)
COM1
1
DCD
TXD-
TXD-
DATA-
2
RXD
TXD+
TXD+
DATA+
3
TXD
RXD+
RXD+
-----------
4
DTR
RXD-
RXD-
-----------
5
GND
GND
GND
GND
6
DSR
-----------
RTS-
-----------
7
RTS
-----------
RTS+
-----------
8
CTS
-----------
CTS+
-----------
9
RI/5V/
12V
-----------
CTS-
-----------
