Multiplex system for automatic meter reading
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United States of America Patent
Stats
-
Dec 1, 1987
Grant Date -
N/A
app pub date -
Oct 21, 1983
filing date -
Oct 21, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A remote meter reading system employing a plurality of multiplexers coupled between the telephone central office and remote interrogatable utility data sources. A number of lines are connected to a single data channel through a plurality of multiplexers. An interrogation signal source is connected to the multiplexer for sending controllable level interrogation signals to the data sources under the control of a microprocessor. The level of interrogation signal which produces a response from each different data source is stored. Upon failure to evoke a response from the highest level of interrogation signal causes that line to be recorded in memory as defective. The number of OFF-HOOK conditions encountered in a predetermined period is recorded and any excess of a predetermined value deleted as a line trouble condition. Signalling in the preferred embodiment is via pulse width modulated signals. In the alternate embodiment, dual tone signalling is employed.
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