Chapter 2 – DFI BT253 User Manual
Page 20
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20
Chapter 2 Hardware Installation
Chapter 2
COM 1/COM 2 /COM 3/COM 4
RS232
RS422
Full Duplex
RS485
RT
S-
RI
-
DSR
-
CTS-
6 7 8 9
DCD-
TXD
RXD
DT
R-
GND
1 2 3 4 5
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
-
1 2 3 4 5
GND
N.C.
N.C.
N.C. N.C. N.C. N.C.
6 7 8 9
COM 4 (Serial) Port
This DB-9 serial port can be used as a RS232/422/485 COM port or as an isolated 8-bit DIO
via the jumper setting. Refer to “COM 4/DIO Select“ in this section for its respective configura-
tion.
8-bit DIO (4-bit in and 4-bit out)
The 8-bit Digital I/O connector provides powering-on function to external devices that are con-
nected to the connector.
Pins
COM 4 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
Graphics Interfaces
VGA Port
The VGA port is used for connecting a VGA monitor. Connect the monitor’s 15-pin D-shell cable
connector to the VGA port. After you plug the monitor’s cable connector into the VGA port,
gently tighten the cable screws to hold the connector in place.
HDMI Port
The HDMI port which carries both digital audio and video signals is used to connect a LCD
monitor or digital TV that has the HDMI port.
BIOS Setting
Configure the display devices in the Chipset menu (“North Bridge Configuration” submenu) of
the BIOS. Refer to the chapter 3 for more information.
3
HDMI
The display ports consist of the following:
• 1 HDMI port
• 1 VGA port
VGA