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"bing2005" schreef in bericht
oups.com...
Hi, guys,
Anyone of you know how did a fire alarm control panel receive a
triggered signal from a detector?
How did the fire alarm control panel know when the detector is
triggered?
Thanks a lot!!!


It depends on the system!

conventional systems use a end off line resistor, the panel measures the
current on the line.
If a smoke detektor is triggerd the detektor uses current and the panel
detect's the used current and will go in to the alarm state.

new analog systems uses a busline, no end off line resitors, the panel
comunicate's with the detektor.
the detector send's measured values to the panel and when the tresshold is
reached the panel tells the detector that it should go in to the alarm
state.

regards

bassie