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2
Hardware Installation
Serial (COM) Ports
CTS-
DSR-
DTR-
RD
COM 4
The system board is equipped with 3 onboard serial port (COM 1, COM2 and
COM 4). It is also equipped with a 9-pin connector for connecting an external se-
rial port (COM 3).
The serial ports are RS-232 asynchronous communication ports with 16C550A-
compatible UARTs that can be used with modems, serial printers, remote display
terminals, and other serial devices. To connect COM 3, please refer to the follow-
ing description. The serial port may be 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 cable connector to the 9-pin connector. Make sure the colored stripe on
the ribbon cable is aligned with pin 1 of the connector.
28
COM 2
COM 1
9
RI-
RTS-
COM 3
GND
TD
DCD-
2
1
4
1
4
1
5
5
ON
ON
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