| 摘要 |
<p>A power line communication system in which communication between one master unit and multiple slave units to which independent IDs are assigned for identification are performed via PLC within a range blocked by a filter from an AC line, and the master unit designates the ID of a slave unit the operation of which is to be controlled from among the multiple slave units and performs control, wherein the master unit comprises an alternating-current zero crossing point detection means for an AC power supply, selects a specified section from the cycle of the AC power supply in synchronization with a zero crossing point detected by the alternating-current zero crossing point detection means to communicate with the multiple slave units, limits one communication period to about one fifth to one tenth of the power supply period, and performs communication separately required multiple times, and the slave unit having the ID transmitted from the master unit responds in synchronization with a command sent from the master unit, thereby enabling control of the lighting states of a plurality of LED bulbs and lighting devices at high speed using a commercial alternating-current power line.</p> |
