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Inductive loop diagnostic interface

  • US 5,621,661 A
  • Filed: 08/03/1994
  • Issued: 04/15/1997
  • Est. Priority Date: 08/04/1993
  • Status: Expired due to Term
First Claim
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1. An inductive loop vehicle detector comprising:

  • an inductive loop mountable in a pavement structure; and

    a detector unit connected to the loop wherein the detector unit includes;

    a signal source for energizing the loop;

    control means for monitoring the loop and generating diagnostic data relating to operation of the loop and the signal source;

    memory means for storing the diagnostic data generated; and

    optical output means for producing an optical output signal, the optical output means being controlled by the control means so that the optical output signal is repetitively modulated by a modulation signal based on the stored diagnostic data at a rate such that the data is not discernible by a human.

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