20
Installing the Motherboard
COM1~2: Onboard serial port headers
Connect a serial port extension bracket to this header to add a second serial port to
your system.
1 DCDB Data carry detect
2 NSINB Serial Data In
3 NSOUTB Serial Data Out
4 DTRB Data terminal ready
5 GND Ground
6 DSRB Date set ready
7 RTSB Request to send
8 CTSB Clear to send
9 RI Ring Indicator
10 Key No pin
Pin Signal Name Function
CASEOPEN: Chassis Intrusion Detect Header
Short Chassis cover is removed
Open Chassis cover is closed
Pin 1-2 Function
This detects if the chassis cover has been removed. This function needs a chassis
equipped with instrusion detection switch and needs to be enabled in BIOS.
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