UTC Fire and Security Interlogix VT7420-2DRDT Installation & Operation Instructions page 3

VT/VR7430-2DRDT
RS232 DATA
RS422 DATA
2-WIRE
RS485 DATA
4-WIRE
RS485 DATA
OFF
1 2
ON
ON
OFF
OFF
1 2
ON
OFF
1 2
ON
ON
1 2
ON
ON ON
Ground
8
7
6
5
Data Input
4
Data Output
3
2
Ground
1
8
- Data In
7
+ Data In
6
5
4
3
- Data Out
2
+ Data Out
1
8
- Data In/Out
7
+ Data In/Out
6
5
4
3
2
1
8
- Data In
7
+ Data In
6
5
4
3
- Data Out
2
+ Data Out
1