Addressable transducer with improved address signal processing

Details Addressable transducer with improved address signal processing Addressable transducer with improved address signal processing

1983-08-16

1986-12-09

Ruehl, Charles A.

Communications: electrical

Continuously variable indicating

Frequency variation

34087002, 34082552, G08C 1916, G08C 1904

Patent

active

046283153

ABSTRACT:
An addressable transducer is disclosed for use in a monitoring system of the type including a central station and multiple addressable transducers for monitoring physical conditions. The transducer is connected across a single pair of transmission lines having a voltage thereon modulated at controlled intervals to produce successive binary address signals. Each address signal is produced as a level shift, pulsewidth modulation of the line voltage. An address signal processing circuit includes a memory for storing multiple bits of an assigned address signal. A multiplexer coupled with the memory and operated under clock control derived from the transmitted address signal generates a train of pulses representing the stored address signal in bit-by-bit synchronism with the train of pulses of the transmitted address. A match detector pairs the trains of the pulses and a match counter produces a control signal in response to a match of all bits of the addresses. An electronic switch responds to the control signal and energizes a current sink oscillator in the line voltage for producing a modulating current of the transmission line having a frequency corresponding to the measured condition.

REFERENCES:
patent: 4296413 (1981-10-01), Milkovic
patent: 4486883 (1984-12-01), Kanai et al.

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