| 摘要 |
<p>A modulator (21) modulates a voltage signal corresponding to inputted transmission data, and outputs the signal as a voltage signal between a communication wire (3) and a shared wire (4). A demodulator (22) demodulates a voltage signal based on the potential difference between the communication wire (3) and the shared wire (4), and outputs the signal as a demodulated signal. A connector (24) connects the communication wire (3) and the shared wire (4) to the modulator (21) and the demodulator (22) by means of a high voltage capacitor that withstands voltages up to a predetermined level. A controller (25) receives, as incoming data, serial data corresponding to a voltage signal demodulated in demodulator (22) if the serial data includes an address of its own apparatus, monitors a demodulated signal outputted from the demodulator (22), and outputs transmission data that includes a destination address to the modulator (21) if the controller (25) determines that no signal is being transmitted in the communication wire (3).</p> |
