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17
Chapter 2 Hardware Installation
Chapter 2
COM (Serial) Ports
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.
1
1
ON
2
COM 1
COM 2
COM 3
COM 4
1
2
20
19
Pins
RS-232
RS-422 RS-485
1
DCD_1
TD_1
RD_1
2
DSR_1
---
---
3
RD_1
DTR_1
DCD_1
4
RTS_1
---
---
5
TD_1
DCD_1
---
6
CTS_1
---
---
7
DTR_1
RD_1
---
8
RI_1
---
---
9
GND
GND
GND
10
GND
---
---
11
DCD_2
TD_2
RD_2
12
DSR_2
---
---
13
RD_2
DTR_2
DCD_2
14
RTS_2
---
---
15
TD_2
DCD_2
---
16
CTS_2
---
---
17
DTR_2
RD_2
---
18
RI_2
---
---
19
GND
GND
GND
20
GND
---
---
COM Port Connector
