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Bi-directional pass-point system for controlling the operation of movable barriers

  • US 6,400,112 B1
  • Filed: 08/14/2000
  • Issued: 06/04/2002
  • Est. Priority Date: 03/12/1998
  • Status: Expired due to Fees
First Claim
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1. A method for automatically learning the open and close limits of travel comprising the steps of:

  • receiving a command to cause the movable barrier to move in a first direction to a first position;

    moving the barrier in the first direction toward an intermediate reference point;

    storing the complement of the distance traveled in the first direction as a first limit;

    receiving a command to cause the movable barrier to move in a second direction to a second position;

    moving the barrier in the second direction toward the intermediate reference point;

    storing the complement of the distance traveled in the second direction as a second limit; and

    using the first and second limits as open and close limits of travel for the barrier.

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