Help with multi fire alarm sensors

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Raul44

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Well, I just signed up and hope someone can be of help. By multi-alarm, I mean when a home has multiple alarms, you can wire them so if one trips, they all go off. My question is does anyone know what is on the control line when tripped? DC? pulses?
Thanks folks!
 

Usually a DC voltage. Some use a contact closure, so to be sure, I would take one and test it with a DMM.
 
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