Surveillance Education Category:
Glossary Author:
John Gage
Some cameras, video servers, and DVRs have the ability to accept alarm inputs.
These are inputs from standard sensor devices such as, Passive
Infra-red (PIR) detectors, door contacts, active beams etc. or relay
outputs from intruder alarm panels, or access control panels.
They are most commonly used on DVRs to trigger recording. For example, you can connect a sensor on a door to the alarm inputs on a DVR and have the DVR record whenever the door is open.
Alarm
input circuits can come in a number of forms. Most commonly they are
self powered, so will operate with a passive switch style circuit.
However, in some cases, they expect to be provided with power (normally
12V) as the signal of open or closed. In a few cases manufactures only
supply TTL (very low voltage) level inputs. In that case, they can only
be safely used with normal alarm sensors in conjunction with some
additional isolation circuitry. In this case, it is best to contact the
manufacturer for advice.
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