Remote meter reading
US5594431A · kind A · utility
55Cited by
1References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1994 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Dec 8, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S20/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.