ABB 4620 User Manual page 6

...4 ELECTRICAL CONNECTIONS
...4.1 Serial Connections
Channel 1 Channel 2
Processor Board
Note. For 3-wire applications IC25 must be removed
and the 3-wire link positioned as shown.
4
Serial Retrans. Relay 1
Relay 2
1 – No connection
1 2 3
2 – Rx+
3 – Rx–
4 – Tx+
4 5 6
5 – Tx–
6 – Common (0V)
A – Five-wire Connections
1 – No connection
1 2 3
2 – No connection
3 – No connection
4 – Rx/Tx+
4 5 6
5 – Rx/Tx–
6 – Common (0V)
B – Three-wire Connections
IC22 IC23
IC25
IC24
C – Three- and Five-wire Links
Fig. 4.2 Serial Connections
TBA
Power
Supply
Common (0V)
Rx–
Rx+
Tx–
Tx+
Common (0V)
Rx/Tx–
Rx/Tx+
3-wire
TBB
1
2
3
4
5
1
2
3
4
5
5-wire