Apparatus for bidirectional data transmission
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United States of America Patent
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Jan 3, 1989
Grant Date -
N/A
app pub date -
Apr 17, 1987
filing date -
Apr 29, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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