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COM (Serial) Ports
COM 3 to COM 6:
RS232
1
2
DCD-
RXD
TXD
DTR-
DSR-
GND
RTS-
CTS-
COM 3
COM 4
RI-
9 10
COM 2
COM 2
COM 1
COM 1
COM 1/COM 2:
RS232
COM 1 to COM 9 are fixed at RS232.
The pin functions of the COM port 10 will vary according to jumpers' setting. JP2, JP17 and
JP18 are used to configure the Serial COM port 10 to to RS232, RS422 (Full Duplex) or RS485
and JP14 allows you to configure it to pure RS232 or RS232 with power. Refer to "COM 10
RS232/422/485 Select" and "COM 10 RS232/Power Select" in this chapter for more informa-
tion.
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
COM 7 to COM 9:
RS232
10
9
RI-
COM 5
CTS-
RTS-
COM 6
DSR-
GND
DTR-
TXD
RXD
DCD-
2 1
COM 7
COM 8
COM 9
COM 10
10
9
COM 10:
RS232/422/485
2 1
Chapter 2
Note:
1. HD332-H81X: 10 COM (COM 1 to COM 10).
HD332-H81B: 2 COM (COM 1 and COM 2).
2. When COM 10 RS232/422/485 is selected, JP17 and JP18 must be set in
accordance to JP2.
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