ECS A780GM-A Ultra, Manual, Page: 21 / 70

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