| 摘要 |
Switching devices for controlling a load from multiple locations each monitor the position of the device's switch member, and generate signals in response to a change of the member from the 'on' position to the 'off' position, and vice versa. Upon detecting such a change, an 'on' or 'off' signal is sent to each other switching device, which automatically updates the position of its switching member to match that which was manually actuated by the user. A load connected to at least one of the switching devices is accordingly switched between an energized and non-energized state by making or breaking continuity in the load circuit at that switching device. By automatically updating the switching member positions among all the devices, a user can visually make an accurate determination of the load circuit status at any given time based on the current position of any switching member among the devices.
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