www.dfi.com
18
Chapter 2 Hardware Installation
Chapter 2
VGA
1
VGA
/
DVI-I
COM2 (Serial) Port/ Isolated 4-bit DIO
RS232/422/485 COM2
or Isolated 4-bit DIO
This DB-9 port can be used as an RS232/422/485 COM port or as an isolated 4-bit DIO. Refer
to the jumper setting in this section for its respective configuration.
COM2 (Serial) Port
The serial port is an asynchronous communication ports with 16C550A-compatible UARTs that
can be used with modems, serial printers, remote display terminals, and other serial devices.
Isolated 4-bit DIO (2-bit in and 2-bit out)
The isolated 4-bit Digital I/O connector provides powering-on function to external devices that
are connected to these connectors.
COM 2
RS232
RS422
Full Duplex
RS485
DCD-
TXD
RXD
D
TR-
GND
1 2 3 4 5
RT
S-
RI-
DSR
-
CT
S-
6 7 8 9
RX+
TX+
RX
-
TX
-
GND
1 2 3 4 5
6 7 8 9
N.C. N.C. N.C. N.C.
D
ATA
+
D
ATA
-
N.C. N.C. N.C. N.C.
6 7 8 9
1 2 3 4 5
GND
N.C.
N.C.
Pins
COM2 Function
DIO Function
RS232
RS422
RS485
1
DCD
RX+
DATA+
DIN0A
2
RX
RX-
DATA-
DIN0B
3
TX
TX+
NC
DIN1A
4
DTR
TX-
NC
DIN1B
5
GND
GND
GND
GND
6
DSR
NC
NC
DOUT0A
7
RTS
NC
NC
DOUT0B
8
CTS
NC
NC
DOUT1A
9
RI
NC
NC
DOUT1B
