www.dfi.com
16
Chapter 2 Hardware Installation
Chapter 2
COM (Serial) Port
ON
1 2 3 4 5 6 7 8
COM 3: RS232/422/485
COM 3
COM 3 can be selected among RS232, RS422 and RS485. RS485 communication supports auto
flow control.
The serial port is asynchronous communication ports with 16C550A-compatible UARTs that can
be used with modems, serial printers, remote display terminals, and other serial devices.
Pin RS-232
RS-422
RS-485
1
DCD
TX-
DATA-
2
DSR
NC
NC
3
SIN
TX+
DATA+
4
RTS
NC
NC
5
SO
RX+
NC
6
CTS
NC
NC
7
DTR
RX-
NC
8
RI
NC
NC
9
GND
GND
GND
2
1
9
