Two-way signal transmission and one-way DC power supply using a single line pair
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United States of America Patent
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May 22, 1984
Grant Date -
N/A
app pub date -
Apr 22, 1981
filing date -
Apr 22, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal transmission system which perform two-way signal transmission between a first transmitter-receiver and a second transmitter-receiver via a pair of signal lines and supplies a DC current from the first transmitter-receiver to the second transmitter-receiver. In each of the first transmitter-receiver and the second transmitter-receiver, there are provided a current varying circuit for varying a signal line current by a transmission pulse signal so that the signal line current may assume a value in a predetermined current region lower than a minimum level of a load current to the other transmitter-receiver during sending out a signal pulse, a current detector for detecting a current or voltage variation in the signal line current, and a gate circuit for blocking the detected output from the current detector while the transmission pulse is sending out to the current varying circuit.
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