Automatic meter reading system with malfunction protection

Details Automatic meter reading system with malfunction protection Automatic meter reading system with malfunction protection

1989-09-08

1991-06-18

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

340512, 34087002, H04M 1100

Patent

active

050254707

ABSTRACT:
An output metering pulse signal is developed by measuring impedances at input terminals which are connected through lead wires to a metering unit shifted between low impedance and high impedance states while output malfunction signals are developed in response to open and shorted conditions of the lead wires, each open or shorted condition malfunction signal being developed by sensing the magnitude of the voltage at an input terminal during periodic brief applications of a strobe voltage to the input terminal through an impedance. Such output metering pulse and malfunction signals are developed in each of a plurality of automatic meter readers and are stored in the automatic meter for subsequent transmission over telephone lines to a utility control center.

REFERENCES:
patent: 4337466 (1982-06-01), Spahn
patent: 4357601 (1982-11-01), McWilliams
patent: 4833618 (1989-05-01), Verma et al.
patent: 4881072 (1989-11-01), Carnel

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