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Quick Reference Guide
RITY102 Quick Reference Guide 11
2.2.2
External Serial Port 2 connector (COM2)
In RS-232 Mode
Signal
PIN PIN
Signal
DCDB#
1
2
RXDB
TXDB
3
4
DTRB#
GND
5
6
DSRB#
RTSB#
7
8
CTSB#
RIB#
9
In RS-422 Mode
Signal
PIN PIN
Signal
TxD1-
1
2
TxD1+
RxD1+
3
4
RxD1-
GND
5
6
NC
NC
7
8
NC
NC
9
In RS-485 Mode
Signal
PIN PIN
Signal
DATA1-
1
2
DATA1+
NC
3
4
NC
GND
5
6
NC
NC
7
8
NC
NC
9