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A security system including a plurality of sensor loops, each having a plurality of detectors and associated detector identification devices which upon actuation produce analog detector signals of different amplitude for each detector in such loop to identify the actuated detector. The sensor loops

A security system including a plurality of sensor loops, each having a plurality of detectors and associated detector identification devices which upon actuation produce analog detector signals of different amplitude for each detector in such loop to identify the actuated detector. The sensor loops each have a common loop output which is connected to a different one of a plurality of input terminals of an analog to digital converter and multiplexer circuit which includes a multiplexer switching circuit for selectively switching between such inputs and which converts the selected analog detector signal to a digital detector output signal. The outputs of the analog to digital converter are connected to a digital data processor circuit, such as a microprocessor computer, for processing the digital detector signals to determine which detector produced such signals and to generate a corresponding output signal that may operate an alarm means such as a bell or indicator light. The sensor loops each include a plurality of detectors which may be detector switches that are connected in series or in parallel sensor circuits, such sensor circuits each including an identification device for identifying its associated detector when such detector is actuated. The identification devices can be resistors each of a different value for its associated detector, or it can be constant current sources or constant voltage sources of different values.

대표청구항 ▼

A security system having detector sensing and identification by analog signal amplitude, comprising: sensor loop means including a plurality of sensor loops for generating detector signals when detectors in said loops are actuated, each sensor loop including a plurality of detectors which are connec

A security system having detector sensing and identification by analog signal amplitude, comprising: sensor loop means including a plurality of sensor loops for generating detector signals when detectors in said loops are actuated, each sensor loop including a plurality of detectors which are connected in parallel sensor circuits and are coupled to a common loop output for applying an analog detector signal to said loop output when any of said detectors are actuated; identification means provided in each sensor loop with a separate identification means connected to each detector, for producing analog detector signals of different D.C. amplitudes for the detectors of each loop, each detection signal amplitude also being different than the sum of any combination of the other detection signal amplitudes produced by the other detectors of the loop; signal processor means for processing the detector signals to determine which detector produced a given detector signal and to generator a corresponding output signal; and alarm means connected to the output of said signal processor means for indicating when said detectors are actuated.