DFI HU171 - Manual (Page 25)

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25
Chapter 2 Hardware Installation
Chapter 2
COM (Serial) Ports
COM 2, COM 3 and COM 4 are fixed at RS232.
The pin functions of COM port 1 will vary according to JP3’s, JP5’s and JP6’s setting. JP4 is
used to configure Serial COM port 1 to pure RS232 or RS232 with power. Refer to “COM 1
RS232/RS422/RS485 Select” and “COM 1 RS232/Power Select“ in this chapter for more infor-
mation.
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:
RS232/422/485
COM 2 to COM 4:
RS232
2
1 9
RXD
DCD- TXD
D
TR
-
GND
DSR
-
RT
S-
CTS-
RI
-
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:
When COM 1 RS232/422/485 is selected, JP5 and JP6 must be set in accordance to
JP3.
COM 4
COM 3
COM 1
COM 2