Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1981-09-28
1983-10-11
Trafton, David L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340552, 340538, 34082537, 455 41, G08B 108
Patent
active
044095902
ABSTRACT:
A system for providing perimeter security, intra-building communication and control functions, utilizes a pair of single wire loops placed about the periphery of the building, and spaced from one another. At least one facilities unit, for fire detection, appliance control and the like functions, has the powering battery thereof series-connected in one of the perimeter loops, and with that loop being connected to battery trickle-charging circuitry. Each of the unit batteries is bypassed by a capacitive element, selected for the frequency, partly determined by the capacitance between the pair of loops, of an oscillator for detecting proximity of intruders adjacent to the building periphery. The proximity-detection oscillator includes a transformer for coupling a data transceiver to and from the remaining loop, whereby voice and/or digital communications may be modulated upon a magnetic field extending throughout the interior of the building for communications to and from independent units therein.
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Davis Jr. James C.
General Electric Company
Krauss Geoffrey H.
Snyder Marvin
Trafton David L.
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