Abstract:
A digital data recorder is described having inherent circuitry characteristics that will re-establish the recorded data state previously established just prior to a power failure upon the return of the source power supply. The retentive characteristics of the recorder are supplied from an arrangement of magnetic memory cores which controllably vary the time constants associated with given portions of the circuitry of a digital counter comprising the major subunit of this invention. In one embodiment the counter is supplied with a zero inhibit to prevent reverse counting past the zero output state, thus preventing a false indication of the recorded data. The circuitry thus described, basically comprising solid state elements, provides a compact, resilient unit with no mechanical moving elements.
Abstract:
An elevator system for a building having a plurality of floors, an elevator car mounted for movement to serve the floors, and a car position indicator which indicates the position of the elevator car in the building. The car position indicator includes a matrix having a plurality of row and column conductors and associated row and column driver circuits, respectively, with an indicator for each floor served by the car, such as a lamp, connected between predetermined row and column conductors. A position signal responsive to the position of the elevator car in the building is used to selectively activate predetermined row and column drivers, with the energized indicator having a predetermined relationship to the position of the elevator car in the building.
Abstract:
An elevator system for a building having a plurality of floors, an elevator car mounted to serve the floors, and hall lamps disposed at the floors served by the car, which lamps are selectively operated in response to predetermined actions of the elevator car. Driver circuits are disposed between the hall lamps and a power supply. The power supply is limited as to the current it will supply, with the maximum current being less than the normal current inrush to a hall lamp. A shorted hall lamp or associated driver circuit turns off the power supply until such time that the shorted load circuit is not selected for connection to the power supply.