COM2: Onboard serial port connector
(optional)
Connect a serial port extension bracket to this header to add a second serial
port to your system.
Pin
Signal Name
Function
1
NDCDB
Data carry detect
2
NSINB
Serial Data In
3
NSOUTB
Serial Date Out
4
NDTRB
Data terminal ready
5 GND
Ground
6
NDSRB
Date set ready
7
NRTSB
Request to send
8
NCTSB
Clear to send
9 NRIB
Ring
Indicator
10 Key
Key
23