Alarm system having improved communication

Details Alarm system having improved communication Alarm system having improved communication

2006-08-15

2006-08-15

Crosland, Donnie L. (Department: 2636)

Communications: electrical

Condition responsive indicating system

With particular system function

C340S505000, C340S286050, C340S538000, C340S538150, C340S693300

Reexamination Certificate

active

07091847

ABSTRACT:
In a fire alarm system, a message is sent on a pair of power lines to a notification appliance. The notification appliance responds to the message by activating one or more of its notification devices. In a standby mode, only enough power is supplied to the plural notification appliances, at a first voltage level, to support two-way communications between a system controller and the notification appliances. In an active mode, power is supplied at a second voltage sufficient to operate audible and visible alarms of the notification appliance.

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patent: 6426697 (2002-07-01), Capowski et al.

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