Safety string polling system

Details Safety string polling system Safety string polling system

1996-05-02

1997-03-11

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

With monitoring, signalling, and indicating means

187280, 187247, B66B 300, B66B 128

Patent

active

056103743

ABSTRACT:
A method of and apparatus for detecting the operative status of each of a series of remote stations connected to a main control in an elevator system includes a step or apparatus for causing the main controller to develop a roll call signal which is transferred to a first of the series of remote stations, transmitting an operative status reply signal from the remote station to the main controller if the remote station is functional following receipt of the roll call signal by the remote station, transferring the roll call signal to a next of the series of remote stations after the reply signal is sent to the main controller, and continuing to transmit an operative status reply signal until each of the remote stations has done the same, if operative.

REFERENCES:
patent: 4367810 (1983-01-01), Doane et al.
patent: 4736367 (1988-04-01), Wroblewski et al.
patent: 4809177 (1989-02-01), Windle et al.
patent: 4864519 (1989-09-01), Appleby et al.
patent: 4898263 (1990-02-01), Manske et al.
patent: 4980913 (1990-12-01), Skret
patent: 5107964 (1992-04-01), Coste et al.
patent: 5383535 (1995-01-01), Ando
patent: 5487448 (1996-01-01), Schollkopf et al.

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