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公开(公告)号：CA2452931A1
公开(公告)日：2004-06-26
申请号：CA2452931
申请日：2003-12-15
Applicant: CHAMBERLAIN GROUP INC
Inventor： GAVEL ANDREW , CHEN WILLIAM , PULIS DEREK
Abstract: Methods and apparatus for sensing barrier position in a barrier movement system are disclosed. Electrical apparatus is connected to the barrier and generates a barrier position signal representative of barrier positions which may be used by a controller to detect barrier position. The electrical apparatus can be manually adjusted to reflect a first barrier position such as a closed position. Other barrier positions can be sensed by comparin g the barrier position signal to other manually adjustable position signals.
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