Com (Serial) Ports; Com Port Connector - DFI BW551 User Manual

COM (Serial) Ports

COM 1
20
2
COM 2
19
1
COM 3
COM 4
COM 1 and COM 2 can be selected among RS232, 422 and 485. COM 3 and COM 4 are fixed
at RS232.
The serial ports are asynchronous communication ports with 16C550A-compatible UARTs that
can be used with modems, serial printers, remote display terminals, and other serial devices.
Connecting External Serial Ports
Your COM port may come mounted on a card-edge bracket. Install the card-edge bracket to
an available slot at the rear of the system chassis then insert the serial port cable to the COM
connector. Make sure the colored stripe on the ribbon cable is aligned with pin 1 of the COM
connector.
BIOS Setting
Configure the serial COM ports in the Advanced menu ("Super IO Configuration" submenu) of
the BIOS. Refer to the Chapter 3 for more information.
Chapter 2 Hardware Installation
Chapter 2

COM Port Connector

Pins
1
2
3
4
5
1
2
6
7
8
9
10
1 11
12
13
14
15
16
17
18
19
20
17
RS-232 RS-422 RS-485
DCD_1 TD_1 RD_1
--- ---
DSR_1
RD_1 DTR_1 DCD_1
--- ---
RTS_1
---
TD_1 DCD_1
--- ---
CTS_1
---
DTR_1 RD_1
--- ---
RI_1
GND GND GND
--- ---
GND
DCD_2 TD_2 RD_2
--- ---
DSR_2
RD_2 DTR_2 DCD_2
--- ---
RTS_2
---
TD_2 DCD_2
--- ---
CTS_2
---
DTR_2 RD_2
--- ---
RI_2
GND GND GND
--- ---
GND
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