Alarm sensor multiplexing
First Claim
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1. A security system for monitoring a protected area and sounding an alarm comprising:
- at least one sensor arranged about a protected area for sensing incoming threat;
at least one pulse generator for generating at least one pulse for said sensor activated by said incoming threat to said area;
an alarm controller for receipt of said pulses and sounding of an alert;
a single wire connecting output of said pulse generator to said controller for transmission of said pulses to said controller;
a counter for measuring said pulsewidth of each said pulse;
said pulse generator generating a first pulse in response to a low level of threat and a second pulse in response to a high level of threat, each said pulse having a different assigned pulsewidth, wherein only said first pulse is generated for communication of said low level of threat received by said sensor, and said first and second pulses are generated for communication of said high level of threat received by said sensor.
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Abstract
A security system for monitoring a protected area and sounding an alarm including a plurality of sensors arranged about a protected area for sensing incoming threat, device for generating at least one pulse for each sensor activated by the incoming threat to the area, an alarm controller for receipt of the pulses and sounding of an alert, and a single wire connecting outputs of the sensors to the controller for transmitting the pulses generated by the plurality of sensors to the controller.
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Citations
24 Claims
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1. A security system for monitoring a protected area and sounding an alarm comprising:
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at least one sensor arranged about a protected area for sensing incoming threat; at least one pulse generator for generating at least one pulse for said sensor activated by said incoming threat to said area; an alarm controller for receipt of said pulses and sounding of an alert; a single wire connecting output of said pulse generator to said controller for transmission of said pulses to said controller; a counter for measuring said pulsewidth of each said pulse; said pulse generator generating a first pulse in response to a low level of threat and a second pulse in response to a high level of threat, each said pulse having a different assigned pulsewidth, wherein only said first pulse is generated for communication of said low level of threat received by said sensor, and said first and second pulses are generated for communication of said high level of threat received by said sensor. - View Dependent Claims (2, 3, 4)
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5. A security system for monitoring a protected area and sounding an alarm comprising:
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at least one sensor arranged about a protected area; said sensor sensing incoming threat to said protected area for generation of at least one electrical signal proportional to said incoming threat; a pulse generator producing a single pulse in response to a low level of threat and at least two pulses in response to a high level of threat, each said pulse having a different assigned pulsewidth for each said sensor, wherein only said first pulse is generated for communication of said low level of threat received by said sensor, and said first and second pulse are generated for communication of said high level of threat received by said sensor; a common output for coupling said pulses; and
,a single wire connecting said common output and said controller for transmission of said pulses to said controller. - View Dependent Claims (6, 7, 8, 9)
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10. A method of multiplexing the output of multiple sensors over a single wire comprising the steps of:
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arranging at least one sensor about a protected area; said sensor sensing incoming threat to said protected area and generating at least one electrical signal proportional to said incoming threat; converting said electrical signal to a single pulse in response to a low level of threat and at least two pulses in response to a high level of threat, each said pulse having a different assigned pulsewidth for each said sensor, wherein only said first pulse is generated for communication of said low level of threat received by said sensor, and said first and second pulse are generated for communication of said high level of threat received by said sensor; coupling said pulses to a common output; and
,transmitting said pulses to said controller on a single wire connecting said common output and said controller for receipt of said pulses and sounding of an alert. - View Dependent Claims (11, 12, 13, 14)
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15. A method of multiplexing the output of multiple sensors over a single wire comprising the steps of:
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arranging at least one sensor about a protected area; said sensor sensing incoming threat to said protected area and generating at least one electrical signal proportional to said incoming threat; converting said electrical signal to a single pulse in response to a low level of threat and at least two pulses in response to a high level of threat, each said pulse having a different assigned pulsewidth for each said sensor, wherein only said first pulse is generated for communication of said low level of threat received by said sensor, and said first and second pulse are generated for communication of said high level of threat received by said sensor; coupling said pulses to a common output; transmitting said pulses to said controller on a single wire connecting said common output and said controller for receipt of said pulses and sounding of an alert; measuring said pulsewidth of each said pulse with a counter embedded within said controller for identification of said sensor by its unique pulsewidth and cataloging the activation of said sensor within controller memory for a subsequent report; identifying said sensor by its assigned pulsewidth; and
,storing an event of activation of said sensor in a controller memory. - View Dependent Claims (16, 17, 18, 19)
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20. A method for monitoring a protected area and sounding an alarm comprising:
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arranging at least one sensor about a protected area for sensing incoming threat; generating a first pulse in response to a low level of threat and generating a second pulse in response to a high level of threat, each said pulse having a different assigned pulsewidth, wherein said first pulse is generated for communication of said low level of threat received by said sensor, and said second pulse is generated for communication of said high level of threat received by said sensor; connecting outputs of said sensor to a controller with a single wire for transmitting said pulses generated by said sensor to said controller and sounding an alert; and measuring said pulsewidth of each said pulse with a counter. - View Dependent Claims (21, 22, 23, 24)
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Specification