DFI HD636-H81CS - Manual (Page 21)

21
Chapter 2 Hardware Installation
Chapter 2
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COM (Serial) Ports
COM 1 to COM 7 are fixed at RS232.
The pin functions of COM port 8 will vary according to jumpers’ setting. JP2, JP17 and JP18
allow you to configure the Serial COM port 8 to RS232, RS422 (Full Duplex) or RS485. JP14 is
used to configure the Serial COM port 8 to pure RS232 or RS232 with power. Refer to “COM 8
RS232/422/485 Select” and “COM 8 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.
COM 1/COM 2:
RS232
COM 1
COM 2
COM 8
COM 3/COM 4/
COM 5/COM 6:
RS232
COM 5
COM 3
COM 4
COM 6
RXD DCD-
TXD DTR-
GND DSR-
RTS- CTS-
RI-
10
2 1
9
DCD- TD RD DT
R-
GND
1 2 3 4 5
RT
S-
RI
-
DSR
-
CTS-
6 7 8 9
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.
COM 7: RS232
COM 8: RS232/422/485
COM 7
10 2
1 9
Note:
When COM 8 RS232/422/485 is selected, JP17 and JP18 must be set in accordance to
JP2.