17
Installing the Motherboard
Connecting Optional Devices
Refer to the following for information on connecting the motherboard’s optional
devices:
COM: Onboard serial port header
Connect a serial port extension bracket to this header to add a second serial port to
your system.
1 DCDB Data Carrier Detect
2 SINB Serial Input
3 SOUTB UART B Serial Output
4 DTRB UART B Data Terminal Ready
5 GND Ground
6 DSRB Data Set Ready
7 RTSB RART B Request to Send
8 CTSB Clear to Send
9 RI Ring Indicator
10 Key No pin
Pin Signal Name Function
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