| 摘要 |
PURPOSE:To realize the decrease of the length of an electric line, the simplification of the system, the reduction of the space, etc., by transmitting and receiving the control word formed by the specific pulse between a control board connected to a power supply line via a capacitor and a switch controller. CONSTITUTION:Plural electric devices 3 containing a switch controller 5 having a device code respectively are connected to a power supply line 1 like the branches of a tree. At the same time, a control board 9 is connected to the line with a capacitor 8, and the controller 5 is connected to the line with the capacitor 8. Then a control word including the device code and the working code is formed with plural pulses which are transmitted and received by one and every cycle of the commerical frequency voltage via the line plus both capacitors 8 and 8. The controller 5 consists of, for example, a transmitter/receiver 11, a processor 12, a flip-flop 21, an amplifier 22, an electromagnetic contact 20, etc. |
