| 摘要 |
In a system in which a power supply provides power to a plurality of remote devices and sensoring devices, apparatus for applying an initial control signal to the power source lines activates a clock/logic network associated with each group of remote sensoring devices and load devices. The initial control signal defines and synchronizes a plurality of time intervals following the initial control signal. A sensor associated with a clock/logic apparatus can apply a signal to the power line during a time interval that can be interpreted by the control apparatus as an indication of a state of the associated sensor. Similarly, the clock/logic apparatus can enable a load element during a pre-established time interval following the initial control signal, however, the load element can be activated only if the control apparatus applies a signal to the power lines during the pre-established period. The system thus utilized the power conductors to communicate control information and sensor data between a control apparatus and remote devices.
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