Modifications

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Switches can be normally closed or normally open. When they are triggered, they change state (closed goes open, open goes closed). The monitoring unit notices the change and if it meets criteria that it believes is an alarm, it annunciates.

Au repos (donc sans action externe), les interrupteurs/switchs peuvent être soit "normalement ouvert", soit "normalement fermé". Ils changent d'état lorsqu'ils sont activés (Un "normalement fermé" s'ouvre, un "normalement ouvert" se ferme). Le système de surveillance note ce changement d'état et s'il rencontre les critères d'alarme alors il annonce l'alarme.

Annunciations can take as many forms as sensors. The stereotype alarm system has a very large horn to make an ear-splitting sound. But it can be much more subtle. The central monitor can alert a "silent alarm": making the alarm known in some way, either locally or far away. An example would be a text or SMS message on your phone stating an alarm has been triggered. The simplest alarm may only trigger a local alarm not designed to scare the intruder - this can be a nearby notification or it could be a record of alarm events for later review.

Annunciations can take as many forms as sensors. The stereotype alarm system has a very large horn to make an ear-splitting sound. But it can be much more subtle. The central monitor can alert a "silent alarm": making the alarm known in some way, either locally or far away. An example would be a text or SMS message on your phone stating an alarm has been triggered. The simplest alarm may only trigger a local alarm not designed to scare the intruder - this can be a nearby notification or it could be a record of alarm events for later review.