Automatic meter-reading and controlling system

Details Automatic meter-reading and controlling system Automatic meter-reading and controlling system

1975-12-17

1977-05-10

Cooper, William C.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340151, H04M 1100

Patent

active

040229777

ABSTRACT:
An automatic meter-reading system monitors broadly distributed utility meters over a communication link by indirectly measuring the resistance value representative of the digit shown on the meter from calculation using the equation derived from the theory of four-terminal network. Based on the similar principle, an automatic remote controlling system monitors the answer-back signal representative of the condition of the controlled equipment at a remote station. Similarly, an automatic meter-reading system monitors a telephone subscriber's telephone call meter centrally located in a telephone exchange office.

REFERENCES:
patent: 3414676 (1968-12-01), Long
patent: 3588889 (1971-06-01), Schulein
patent: 3742454 (1973-06-01), Baker
patent: 3825733 (1974-07-01), White

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