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METHOD FOR CONTROLLING AT LEAST ONE LIGHT BARRIER, CONTROL CIRCUIT AND THUS EQUIPPED SELF-SERVICE TERMINAL

  • US 20160255696A1
  • Filed: 02/23/2016
  • Published: 09/01/2016
  • Est. Priority Date: 02/26/2015
  • Status: Active Grant
First Claim
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1. A method (1000) for controlling at least one light barrier (108), wherein light (L) is emitted from an optical transmitter (T) to an optical receiver (R), wherein a current reception level (RV) is determined in dependence from the received light (L), and wherein a control circuit (110) is used to check whether the current reception level (RV) falls below a lower threshold (TH1) or exceeds an upper threshold (THh) to determine whether the light barrier (108) is interrupted or not, the method comprising:

  • adjusting the thresholds (TH1;

    THh) initially in dependence on a predetermined minimum reception level (TVm) so that each of the thresholds (TH1;

    THh) is a fraction of the minimum reception level (TVm);

    defining an allowable reception level range (RNG) between the minimum reception level (TVm) and a predetermined saturation reception level (SL); and

    checking in a first sequence of steps (1100) whether the current reception level (RV) is outside the allowable reception level range (RNG) (step 1112), and, if the current reception level (RV) is outside the allowable reception level range (RNG),calibrating, in a second sequence of steps (1200), at least a parameter (SC) for the operation of the optical transmitter (T) in dependence on the minimum reception level (TVm) and/or the saturation reception level (SL) (1232).

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