VT/VR1900
RS232 DATA
Data Output
Ground
6
5
4
3
2
1
7
7
7
7
Data Input
Tamper Switch
Tamper Switch
Tamper Switch
ON
OFF
OFF
2
1
RS422 DATA
ON
OFF
OFF
2
1
- Data Input
6
5
4
3
2
1
- Data Output
+Data Output
6
5
4
3
2
1
Tamper Switch
2-WIRE
RS485 DATA
ON
ON
2
1
OFF
4-WIRE
RS485 DATA
ON
1
ON
ON
2
+Data Input
- Data Input/ Output
+Data Input/ Output
- Data Input
6
5
4
3
2
1
- Data Output
+Data Output
+Data Input
NOT USED
ON
1
OFF
ON
2
NOTE: Switch 3
ON:
will pass data.
OFF:
will pass Tamper Switch status and data from
VR to VT, but not from VT to VR.
FUNCTIONALITY OF TAMPER SWITCH:
The tamper switch terminals on the VR will open upon one of
the following conditions; loss of carrier, loss of video, switching
of SW3 on the VT to the ON position.
