H - Electricity
04
M
379/5
H04M 11/06 (2006.01) H04M 11/00 (2006.01)
Patent
CA 1254686
ABSTRACT OF DISCLOSURE A method of and apparatus for remotely reading at least one of a plurality of utility meters at a subscriber's location using the subscriber's non-dedicated telephone communication line is disclosed in which the device is activated only during a certain time on a predetermined day of the month and only after a pre- determined number of ring signals are detected on the subscriber's line. An identifying tone signal is generated at the central station and sent to the meter reader at the subscriber's location where it is detected and compared to a pre-set tone signal. Upon acceptance, the meter reader then sequentially reads a plurality of voltages which are produced by applying a pre-determined voltage to a plurality of contacts for each utility meter dial. The vol- tage applied to the contacts passes through a plurality of zener diodes of different values. The different voltages thus generated correspond to the consumption registered by the utility meter. After being read, they are then converted to standard DTMF tone signals and transmitted to the central station for storage.
514669
Gowling Lafleur Henderson Llp
Lectrolarm Custom Systems Inc.
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