20
MB991AF
User’s Manual
2.5.2
COM3 & COM4 Ports (CN2)
1
6
5
9
1
6
5
9
Pin
Assigment
Pin
Assigment
1
DCD, Data carrier detect
6
DSR, Data set ready
2
RXD, Receive data
7
RTS, Request to send
3
TXD, Transmit data
8
CTS, Clear to send
4
DTR, Data terminal ready 9
RI, Ring indicator
5
Ground