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Chapter 5 Ports and Connectors
Chapter 5
COM (Serial) Ports
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 7 for more information.
COM 1, COM 7 and COM 8:
RS232/422/485
COM 1, COM 7 and COM 8
RS485
RS422
Full Duplex
RS232
DCD-
TD
RD
DT
R-
GND
1 2 3 4 5
RT
S-
RI
-
DSR
-
CTS-
6 7 8 9
N.C. N.C. N.C. N.C.
6 7 8 9
D
ATA
+
D
ATA
-
1 2 3 4 5
N.C.
N.C.
N.C.
RXD+
TXD+
RXD-
TXD- N.C.
1 2 3 4 5
6 7 8 9
N.C. N.C. N.C. N.C.
COM 6
COM 10
COM 1
COM 6, COM 9 and COM 10:
RS232
COM 7
COM 8
COM 9
