ITX-D255R Mini-ITX Mother Board Manual
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2.7 I/O Connectors
2.7.1 COM#1 Port
Connector SPEC Shape Signal Description Remark
DSUB 9Pin
Refer to below
No
Signal Description
No
Signal Description
RS-232 RS-422 RS-485 RS-232 RS-422 RS-485
1 DCD - - 6 DSR - -
2 RXD RX (-) - 7 RTS TX (-) Data (-)
3 TXD TX (+) Data (+) 8 CTS RX (+) -
4 DTR - - 9 RI - -
5 GND GND - - - - -
NOTE] COM#1 port support 3-types interface (RS-232 / RS-422 / RS-485). The Interface is changed by BIOS.
2.7.2 COM#2 / COM#3 Port
Connector SPEC Shape Signal Description Remark
DSUB 9Pin
Refer to below
No Signal Description No Signal Description
1 DCD 6 DSR
2 RXD 7 RTS
3 TXD 8 CTS
4 DTR 9 COM Power 5V or 12V
5 GND 10 -
NOTE] COM Power Voltage is selected by BIOS.
2.7.3 LAN Port
Connector SPEC Shape Signal Description Remark
RJ-45 with LED
Refer to below
No Signal Description No Signal Description
1 MD0 (+) 5 MD2 (+)
2 MD0 (-) 6 MD2 (-)
3 MD1 (+) 7 MD3 (+)
4 MD1 (-) 8 MD3 (-)
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