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I/O Connectors
COM (Serial) Ports
COM 4
1
2
DCD-
SIN-
COM 3
SO-
DTR-
COM 2
GND
DSR-
COM 1
RTS-
CTS-
RI-
9
COM 3/COM 4:
RS232
COM 1 and COM 2 can be selected among RS232, RS422 and RS485. Configure COM 1 and
COM 2 serial communication mode in the BIOS (the "Super IO Configuration" submenu of the
Advanced menu). 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 ports in the Advanced menu ("Super IO Configuration" submenu) of the
BIOS. Refer to chapter 3 for more information.
Chapter 2 Hardware Installation
1 2
9
COM 1/COM 2:
RS232/422/485
Chapter 2
COM 1/2
Pin
RS232
1
DCD-
2
RD
TD
3
DTR-
4
GND
5
DSR-
6
RTS-
7
CTS-
8
RI-
9
17
RS422 Full Duplex
RS485
TXD-
DATA-
TXD+
DATA+
RXD+
N.C.
RXD-
N.C.
GND
GND
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
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