Redundant sensor adapter

Details Redundant sensor adapter Redundant sensor adapter

1980-09-22

1982-05-25

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340522, 340531, G08B 2900, G08B 1900

Patent

active

043319521

ABSTRACT:
An adapter for a multiwire security and surveillance system which permits the connection of redundant sensors at one location, without affecting the operation of non-redundant sensors at other locations. In one embodiment each of the redundant sensors is coupled to the adapter, such that individual sensor alarm currents are prevented from being applied to the signal wire. In response to simultaneously occuring latched output signals from the redundant sensors, a circuit within the adapter couples to the signal wire the same type alarm condition signal which is provided by the individual sensors. A voltage driver/current sensor circuit is interposed between an associated redundant sensor and the signal line to both sense an alarm condition at the corresponding redundant sensor and to isolate the sensor from the signal line, with the adapter coupling control signals through the associated voltage driver/current sensor circuit to the associated redundant sensor.

REFERENCES:
patent: 3074053 (1963-01-01), McDonough et al.
patent: 3611335 (1971-10-01), Ogden
patent: 3725888 (1973-04-01), Solomon
patent: 3786501 (1974-01-01), Marnerakis
patent: 3801978 (1974-04-01), Gershberg et al.
patent: 4195286 (1980-03-01), Galvin

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