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COM (Serial) Ports
1 2 3 4 5
6 7 8 9
COM 1: RS232
COM 2: RS232/422/485
10
9
2
1
COM 1, COM 3 and COM 4 are fixed at RS232. COM 2 can be selected among RS232, RS422
and RS485 via the BIOS setup utility.
The pin functions of COM 1 and COM 2 will vary according to JP6's and JP8's setting. JP6 and
JP8 allow you to configure COM 1 and COM 2 to RS232 or RS232 with power. Refer to "COM
1/COM 2 RS232/Power Select" in this chapter for more information.
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 COM ports 1/2/3/4 in the Advanced menu ("SIO NUVOTON6106D" submenu) of
the BIOS. Refer to the chapter 3 for more information.
Chapter 2 Hardware Installation
Chapter 2
COM 3/4: RS232
10
9
RI-
RTS-
CTS-
DSR-
GND
DTR-
TXD
DCD-
RXD
2
1
10
9
RI-
RTS-
CTS-
DSR-
GND
TXD-
DTR-
TXD
DCD-
RXD
RXD-
2
1
RS232
22
COM 2
10
9
10
9
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
GND
N.C.
GND
TXD+
N.C.
N.C.
RXD+
DATA-
DATA+
2
1
2
1
RS422
RS485
Full Duplex
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