公开(公告)号：EP0631682B1

公开(公告)日：2000-12-13

申请号：EP93906710.4

申请日：1993-03-19

申请人： ABB Metering Limited

发明人： SHEPPARD, Frank ,  GOSELTINE, Robert

IPC分类号： G08C23/00 ,  H04B5/00

CPC分类号： G08C17/04 ,  G01D4/004 ,  Y02B90/242 ,  Y04S20/322

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.