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Safety string polling system

  • US 5,610,374 A
  • Filed: 05/02/1996
  • Issued: 03/11/1997
  • Est. Priority Date: 05/10/1994
  • Status: Expired due to Fees
First Claim
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1. A method of detecting the operative status of each of a series of remote stations connected to a main controller in an escalator or elevator system, comprising the steps of:

  • (a) causing the main controlling to develop a roll call signal which is transferred only to a first of the series of remote stations;

    (b) 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;

    (c) the functional remote station developing the roll call signal which is transferred to a next of the series of remote stations after the reply signal is sent to the main controller; and

    (d) repeating steps (b) and (c) until each of the remote stations has received the roll call signal.

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