System and method for detecting detector masking

Details System and method for detecting detector masking System and method for detecting detector masking

2006-03-09

2009-11-10

La, Anh V (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular system function

C340S541000, C340S521000, C340S657000, C324S555000

Reexamination Certificate

active

07616109

ABSTRACT:
A system and method is provided for indicating a masking event using transmission wiring delegated for indicating intrusion and tampering events. The method of indicating a masking event utilizes measurable changes in resistance to indicate the current masking state of a detector. When a detector is not masked, a first resistance value is measurable on the transmission wiring, while when a detector is masked, a second resistance value is measurable on the transmission wiring. The transmission wiring connects the detector to a control unit that executes a security-related response based on the value of the measured resistance.

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