Apparatus for bidirectional data transmission

Details Apparatus for bidirectional data transmission Apparatus for bidirectional data transmission

1987-04-17

1989-01-03

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082554, 34087031, 34082570, H04Q 900, G08C 1924

Patent

active

047960280

ABSTRACT:
An apparatus for bidirectional data transmission includes a predominantly stationary part with a data line connected to cause a phase shift of an osicllator signal for transmission to a predominantly mobile part. AC signal components of the oscillator signal received by the mobile part are formed into square wave pulses and a difference between high and low states of the pulses is indicative of a phase shift. During the high and low states, positive signal edges of a second oscillation frequency are counted and compared to one another so that predetermined difference causes a status change on a data output line in the mobile part.

REFERENCES:
patent: 3088099 (1963-04-01), Duvall
patent: 3488632 (1970-01-01), Clark, III
patent: 4549176 (1985-10-01), Kreft
patent: 4654658 (1987-03-01), Walton
patent: 4656472 (1987-04-01), Walton
patent: 4697183 (1987-09-01), Jenning et al.

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