Data transmission system with double lines
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United States of America Patent
Stats
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Aug 18, 1992
Grant Date -
N/A
app pub date -
Apr 1, 1991
filing date -
Apr 4, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A data transmission system with double lines comprises a plurality of sensor terminals connected to the current line in cascade, and a controller connected to a current input side of the first sensor terminal. A switch device in each sensor terminal connects the current line to a sensor circuit for a specified time after a current begins to flow to the current input side of the sensor terminal, and connects the current line to the current output side of the sensor terminal after an elapse of the specified time. After that switching, the current begins to flow to the next sensor terminal. If the sensor turns on while the current is flowing to the sensor circuit, the value of the current of the current line may be greater. The controller detects value of the current and decides state of the sensor circuit in the sensor terminal according to the value of the current.
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