Addressable transducer with a variable frequency oscillation for

Details Addressable transducer with a variable frequency oscillation for Addressable transducer with a variable frequency oscillation for

1981-02-17

1983-08-16

Groody, James J.

Communications: electrical

Continuously variable indicating

Frequency variation

34087003, 34087011, 34087038, 34087039, 34087007, 34087018, G08C 1916, G08C 1904

Patent

active

043994407

ABSTRACT:
An addressable transducer is disclosed for use in monitoring the values of physical conditions in connection with long electric lines, such as telephone cables. Multiple transducers are connected across a single pair of transmission lines which extend from a central station and supply a DC voltage to the transducers. Each transducer has an assigned address in the form of a binary code. An address signal is transmitted on the transmission lines by pulse width modulation of the line voltage. An address detector converts the address to a binary code and the transmitted address is compared with the assigned address. When the assigned address is received, a variable frequency current sink oscillator is turned on and connected across the lines. The oscillator has a frequency determined by a sensor responsive to the physical condition being measured and modulates the line current at that frequency. The frequency of the line current modulation is measured at the central station and represents the value of the physical condition.

REFERENCES:
patent: 3800300 (1974-03-01), Van Oosterhout
patent: 3944928 (1976-03-01), Augenblick et al.
patent: 3952285 (1976-04-01), Falck
patent: 4204195 (1980-05-01), Bogacki

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