| 摘要 |
PURPOSE:To attain an operation at low power consumption by using a reception sensing signal from a signal receiving section so as to limit the power source supplied to a signal amplifier section and a signal reception section in the reversing direction. CONSTITUTION:A signal receiving section 1a receives an electric signal from a line 5a, outputs a reception sensing signal 6a and outputs a data signal 8a. Then a signal amplifier section 2a is operated by the reception sensing signal 6a, amplifies a data signal 8a from the signal receiving section 1a to output it to a line 5b. During that time, a signal receiving section 1b in the reversing direction is subjected to the inhibition of reception by the reception sensing signal 6a from the forward signal reception section 1a and the power source supplied through a power line 7b from a power source circuit section 3 is limited by a power source control section 4b. Thus, the power consumption of the reverse signal receiving section 1b and the signal amplifier section 2b not in the receiving state is reduced.
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