Call signal conversion apparatus for elevator system

Details Call signal conversion apparatus for elevator system Call signal conversion apparatus for elevator system

1982-03-19

1986-09-30

Caldwell, Sr., John W.

Communications: electrical

Selective

Interrogation response

340 20, 187 29R, G08B 536

Patent

active

046149317

ABSTRACT:
A call system for an elevator includes a call button and call registration lamp connected to two electrodes of a thyristor. The third electrode is connected to a conversion circuit. The conversion circuit is connected to a control device. The control device determines whether the call signal is to be effective at a given time. The conversion circuit receives the call signal and the indication of effectiveness and forwards the call signal to the control device only when the signal is to be effective. The conversion device includes a memory for storing the state of effectiveness, a call signal detecting circuit and a driving circuit.

REFERENCES:
patent: 3967700 (1976-07-01), Tur et al.
patent: 4120381 (1978-10-01), Otto et al.
patent: 4376930 (1983-03-01), Sasao

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