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Serial (COM) Port
The system board is equipped with a 9-pin connector for connecting an external serial COM
port (COM 1). COM port 1 will vary according to JP4's setting.
The serial COM port is RS232 asynchronous communication port with 16C550A-compatible
UARTs that can be used with modems, serial printers, remote display terminals, and other se-
rial devices. To connect COM 1, please refer to the following 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.
6
6
5
4
4
3
2
2
1
1-2 On: RS232
3-4 On: RS422
(default)
Full Duplex
9
RI-
RTS-
NC.
CTS-
GND
NC.
DSR-
TXD-
DTR-
TXD
RXD-
RXD
DCD-
2 1
RS232
Full Duplex
Chapter 4 Ports and Connectors
9
COM 1:
RS232/422/485
2
1
JP4
5
5
6
3
4
3
1
2
1
5-6 On: RS485
COM 1
9
9
NC.
NC.
NC.
NC.
NC.
NC.
NC.
NC.
TXD+
NC.
TXD
RXD+
DATA-
DATA+
2 1
2 1
RS422
RS485
Chapter 4
MXM Connector
The MXM connector is used to interface the carrier board with a Qseven board. Refer to the
table in the following pages for the pin functions of the MXM connector.
29
MXM
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