ECS H55H-CM Manual page 23

COM1~2: Onboard serial port headers
Connect a serial port extension bracket to this header to add a second serial port to
your system.
Pin Signal Name
1
DCDB
2
NSINB
3
NSOUTB
4
DTRB
5
GND
6
DSRB
7
RTSB
8
CTSB
9
RI
10
Key
CHS: Chassis Intrusion Detect Header
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.
Pin 1-2 Function
Short Chassis cover is removed
Open Chassis cover is closed
Installing the Motherboard
Function
Data carry detect
Serial Data In
Serial Data Out
Data terminal ready
Ground
Date set ready
Request to send
Clear to send
Ring Indicator
No pin
19