Method and a unit for synchronizing burglary detectors

Details Method and a unit for synchronizing burglary detectors Method and a unit for synchronizing burglary detectors

1987-01-09

1989-01-10

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1324

Patent

active

047976594

ABSTRACT:
A method and a unit synchronizes a system for detecting passage of an article through a predetermined area to the mains power wave thereto. The system has a transmitter and a receiver alternately transmitting and receiving electro-magnetic signals as well as a marker secured to the article for receiving said signal and transmitting other signals during article passage of the area. In this manner, undesired interference with a neighboring, like system is avoided, without the interconnection therebetween, because the existing mains network is employed for the synchronizing.

REFERENCES:
patent: 4658241 (1987-04-01), Torre
patent: 4667185 (1987-05-01), Nourse et al.

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