发明授权
EP0631682B1 REMOTE METER READING 失效
远程抄表

REMOTE METER READING
摘要:
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.
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