| 摘要 |
A 2-wire/3-wire converting apparatus having two transmission/reception terminals to be connected to a 2-wire circuit, a transmission terminal, a reception terminal and a common terminal to be connected to a 3-wire circuit. The converting apparatus includes an electric circuit for applying between the two transmission/reception terminals a voltage proportional to a voltage of a reception signal conveyed on the 3-wire circuit and appearing between the reception terminal and the common terminal and for applying a voltage between the transmission terminal and the common terminal a voltage proportional to a voltage obtained by subtracting the voltage proportional to the voltage of the reception signal from a voltage appearing between the two transmission/reception terminals.
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