| 摘要 |
When power is supplied from a power transmitting side device 1, a FET 103 is turned ON and +12V direct current of a power source 101 is supplied to respective power receiving side devices. When transmission data is transmitted from the power transmitting side device 1, +5V direct current of a power source 201-1 is supplied to a terminal a, and a transistor 104 is turned ON/OFF due to a pulse-like voltage change of the transmission data, whereby the transmission data becomes a pulse-like 0V<custom-character file="US20040116101A1-20040617-P00900.TIF" wi="20" he="20" id="custom-character-00001"/>+5V output waveform, and is output to the respective power receiving side devices. When the power transmitting side device 1 receives reply data from the power receiving side device, the power receiving side device changes a voltage to a 3.5V<custom-character file="US20040116101A1-20040617-P00900.TIF" wi="20" he="20" id="custom-character-00002"/>+5V pulse as reply data. A photocoupler 105 detects the voltage change, whereby the power transmitting side device 1 receives the reply data from the power receiving side device.
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