| 摘要 |
An operator controller 10 controls a motor 12 via a motor controller ( 11 ). The motor ( 12 ), in turn, selectively controls movement of an object (such as a movable barrier) along a substantially predetermined path. An incremental movement sensor ( 13 ) monitors movement of the object by monitoring, in one embodiment, movement associated with operation of the motor ( 12 ). At the same time, a passpoint event generator ( 15 ) generates at least some passpoint events that are uniquely identifiable. When a given predetermined passpoint event is detected, the incremental movement sensor activity is potentially recalibrated.
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