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Chapter 2 Hardware Installation
Chapter 2
COM (Serial) Ports
COM 3 to COM 10 are fixed at RS232.
The pin functions of COM 1 and COM 2 will vary according to jumpers’ setting. JP2, JP17 and
JP18 are used to configure the Serial COM port 1. JP16, JP19 and JP20 are used to configure
the Serial COM port 2. JP14 (for COM 1) and JP15 (for COM 2) are used to configure Se-
rial COM ports to pure RS232 or RS232 with power. Refer to “COM 1/COM 2 RS232/422/485
Select” and “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.
2
3
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.
Note:
1. HD620-H81X: 10 COM (COM 1 to COM 10).
HD620-H81B/D: 2 COM (COM 1 and COM 2).
2. When COM 1 RS232/422/485 is selected, JP17 and JP18 must be set in accordance
to JP2.
3. When COM 2 RS232/422/485 is selected, JP19 and JP20 must be set in accordance
to JP16.
COM 3
COM 4
COM 7/COM 8: RS232
2
1
9
DCD-
TD
RD
DT
R-
GND
RT
S-
DSR
-
CTS-
RI
-
COM 5
COM 6
COM 3 to COM 6:
RS232
DCD- TD
RD
DT
R-
GND RT
S-
DSR
-
CTS-
RI
-
2
1
9
COM 8
COM 7
COM 10
COM 9
COM 1/ COM 2:
RS232/422/485
COM 2
COM 1
DCD- TD
RD
DT
R-
GND RT
S-
DSR
-
CTS-
RI
-
2
1
9
COM 9/COM 10:
RS232
