Specifications

Appendixes 47
Controlled Alarm Recording
When alarm recording is controlled by the multiplexer, the VCR
responds to the alarm signal provided by the multiplexer. The
recorder goes into the alarm recording mode and records at the
alarm record speed. It remains in the alarm mode until released by
the multiplexer. Controlled alarm recording requires both video
and alarm connections between the multiplexer and the VCR.
System setup for multiplexer controlled alarm recording:
1. Connect the multiplexer vcr in and vcr out connectors to the
VCRs video output and video input respectively.
2. Connect the VCRs ground to the multiplexer alarms
connector pin 17 (alarm output common).
3. Connect the VCRs alarm input to multiplexer alarms
connector pin 19 if VCR alarm input polarity is active low or
pin 18 if VCR alarm input polarity is active high.
4. Set the multiplexer ALARM DURATION option to the minimum
number of seconds you wish each alarm event to be recorded.
5. Set the VCRs alarm duration option to manual.
6. Set the multiplexer VCR ALARM RECORD TIME option to
match the VCRs alarm recording speed. If using the
Autodetect VCR Speed feature (pin 37 on alarms connector),
the connections between the multiplexer and VCR permit each
unit to change recording speed as needed. See Alarm Output
and Autodetect VCR Speed for details.
7. Set the multiplexer VCR RECORD TIME option to match the
VCRs normal recording speed.