Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1990-11-06
1992-08-18
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340506, 340514, 340513, 340534, 34082536, G08B 2500
Patent
active
051403064
ABSTRACT:
An alarm indicating system utilizing a plurality of remote sensors connected to a wired-OR address bus, the sensors having means for forming a binary address which is placed on the address bus as a series of high and low signal levels when the remote sensor is activated. The system includes a plurality of comparators, each having a binary address corresponding to a remote sensor. The comparators detect the activation of its corresponding remote sensor by monitoring the address bus for presence of the designated address and activating a central alarm indicating system. The system also includes a testing means which can present test addresses onto the address bus, thereby activating the sensors and testing the operation of the comparators. The system includes a means for disabling the testing means when a remote sensor is activated by an external alarm, and therefore the testing means does not interfere with the operation of the system.
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