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ST102-CS
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COM (Serial) Ports
The serial mode of COM 1 and COM 2 can be configured to RS232, RS422 and RS485 via
BIOS, whereas the serial mode of COM 3 and COM 4 is fixed at RS232.
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 (“NCT6116D Super IO Configuration”
submenu) of the BIOS. Refer to the chapter 7 for more information.
COM 1
/
COM 2
RS232
RD
DCD TD
DT
R
GND
DSR
RT
S
CTS
RI
RS422
Full Duplex
RX
-
RX+ TX+
TX
-
GND
N.C.
N.C.
N.C.
N.C.
RS485
DA
TA
-
DA
TA
+
N.C.
GND
N.C.
N.C.
N.C.
N.C.
N.C.
2
1
9
2
1
9
2
1
9
1
2
9
10
COM 4
COM 2
COM 3
COM 1