Remote meter reading
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United States of America Patent
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Jan 14, 1997
Grant Date -
N/A
app pub date -
Dec 8, 1994
filing date -
Mar 19, 1992
priority date (Note) -
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Importance
Abstract
A remote meter reading system, for example for domestic water meters, operates through an inductive coupling over two lines. A sinusoidal power signal is transmitted from a reader to the meter to power up encoding circuitry in the meter. The encoding circuitry then transmits data by intermittently shorting the input terminals to cause an asynchronous voltage modulation at the reader. There is no synchronous relationship required between the periodic power signal and the data transmitted from the encoder to the reader.
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