29 917
modifications
Modifications
Sauter à la navigation
Sauter à la recherche
Ligne 22 :
Ligne 22 : − +
→Plusieurs senseurs, un broche
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.
== Plusieurs senseurs, un broche ==
== Plusieurs senseurs, une branche/ligne, une broche ==
You can use nearly unlimited sensor switches if you place multiple switches in a branch. The branch can sense one switch out of all that may have changed state in a branch. In this manner you can only tell if any one of the multiple sensors in the branch has tripped. You can do this using normally open sensors in parallel or normally closed sensors in series. You can use both types of sensors putting the closed switches in line and the open switches in parallel. The resistor pulls the circuit high if the loop is opened otherwise the loop is grounded.
You can use nearly unlimited sensor switches if you place multiple switches in a branch. The branch can sense one switch out of all that may have changed state in a branch. In this manner you can only tell if any one of the multiple sensors in the branch has tripped. You can do this using normally open sensors in parallel or normally closed sensors in series. You can use both types of sensors putting the closed switches in line and the open switches in parallel. The resistor pulls the circuit high if the loop is opened otherwise the loop is grounded.