| 摘要 |
A control unit ( 10 ) superimposes command signals on AC power passing on a power line or network ( 40 ). A command unit ( 20 ) controls and powers an electrical load ( 50 ) such as a motor M. A command processor ( 26 ) receives radio frequency control signals at a first input ( 24 ) from an antenna ( 12 ) and a receiver/demodulator ( 22 ) and receives command signals from the power line at a second input ( 25 ) connected with a pulse shaping circuit ( 23 ). In a first, normal operating mode, the command processor controls the electrical load in accordance with signals received at the radio frequency input. In a second, special mode initiated power line command signals, the command processor at least temporarily blocks the execution of commands received at the radio frequency input.
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