Redundant sensor adapter
First Claim
1. Apparatus for a facility monitoring system having a multiwire interconnect cable which includes a signal line, said apparatus permitting the connection of redundant sensors at one location to the multiwire interconnect cable without affecting the operation of non-redundant sensors connected to the interconnect cable, comprising:
- an adapter module adapted to be coupled between the redundant sensors and the multiwire interconnect cable, said adapter module including means interposed between each of said redundant sensors and said signal line for sensing an output signal from a corresponding redundant sensor and for isolating said sensor so that its output signal is not applied to said signal line; and
, means for coupling to said signal line a predetermined signal upon the simultaneous or sequential occurrence of sensed output signals from said redundant sensors, said signal line carrying control signals and said sensing and isolating means including means for coupling the control signals carried by said signal line to a corresponding redundant sensor.
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0 Petitions
Accused Products
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.
27 Citations
11 Claims
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1. Apparatus for a facility monitoring system having a multiwire interconnect cable which includes a signal line, said apparatus permitting the connection of redundant sensors at one location to the multiwire interconnect cable without affecting the operation of non-redundant sensors connected to the interconnect cable, comprising:
an adapter module adapted to be coupled between the redundant sensors and the multiwire interconnect cable, said adapter module including means interposed between each of said redundant sensors and said signal line for sensing an output signal from a corresponding redundant sensor and for isolating said sensor so that its output signal is not applied to said signal line; and
, means for coupling to said signal line a predetermined signal upon the simultaneous or sequential occurrence of sensed output signals from said redundant sensors, said signal line carrying control signals and said sensing and isolating means including means for coupling the control signals carried by said signal line to a corresponding redundant sensor.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
Specification