Signal-transmitting junction unit of hazard alarm system

Details Signal-transmitting junction unit of hazard alarm system Signal-transmitting junction unit of hazard alarm system

1985-09-10

1987-05-12

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340531, 340505, 340510, 340511, G08B 108

Patent

active

046653848

ABSTRACT:
A signal transmitting junction unit for a hazard alarm system includes a signal transmission control unit, a zone line circuit connected to an electric source and having at least one hazard sensor connected thereto and an analog digital convertor; and the zone line circuit outputs the source voltage when a sensor connected to the zone line detects a hazard, outputs a voltage between the source voltage and the zero voltage when the sensor is under the normal monitoring standby condition, and outputs no voltage when the sensor is out of order upon calling from the central control unit and the voltage is digitized by the analog-digital converter and sent back to the central control unit through the transmission control unit.

REFERENCES:
patent: 4249166 (1981-02-01), Schultz
patent: 4392125 (1983-07-01), Iwata
patent: 4394655 (1983-07-01), Wynne et al.
patent: 4468664 (1984-08-01), Galvin et al.

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