Intrusion detector for security systems

Details Intrusion detector for security systems Intrusion detector for security systems

1997-03-11

1998-12-01

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340507, 340512, 340547, G08B 1308

Patent

active

058444815

ABSTRACT:
An intrusion detector for security systems includes a stationary host unit and a transponder unit secured to a movable door, window or the like. The host unit is secured to a stationary frame in alignment with the transponder unit. A pair of electromagnetic coupling elements are supported upon the host unit and are aligned with a corresponding mirror image pair of electromagnetic coupling units supported on the transponder unit. The host unit provides a burst of power signal which is magnetically coupled to the transponder unit and rectified therein to provide operative power for the transponder unit. The host unit further provides a data signal magnetically coupled to the transponder unit which communicates a random number to the transponder unit. The transponder unit calculates a pseudo-random number using a predetermined algorithm and communicates the random number back to the host unit. The host unit performs an identical calculation upon the random number to provide a reference pseudo-random number. The host unit then compares the received pseudo-random number to the reference calculated pseudo-random number to verify the continued presence of the transponder unit.

REFERENCES:
patent: 3792493 (1974-02-01), Hughes
patent: 4258358 (1981-03-01), Lee et al.
patent: 4866426 (1989-09-01), Evans et al.
patent: 5534849 (1996-07-01), McDonald et al.

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