Electrical transmission or interconnection systems – Plural load circuit systems – Selectively connected or controlled load circuits
Reexamination Certificate
2008-04-14
2009-11-17
Paladini, Albert W (Department: 2836)
Electrical transmission or interconnection systems
Plural load circuit systems
Selectively connected or controlled load circuits
C307S003000, C340S315000, C137S078200, C700S284000
Reexamination Certificate
active
07619322
ABSTRACT:
A large number of irrigation system devices connected to a common two-wire cable can be powered and individually controlled from a central location by transmitting over the cable DC pulses of alternating polarity. Control information is conveyed by transmitting a command pulse train consisting of a series of pulses, separated by short no-power intervals, whose polarities indicate logic ones or zeros. Following a command pulse train, a selected watering station decoder acknowledges receipt of instructions by drawing current during a predetermined pulse of an alternating-polarity power pulse cycle, while a sensor decoder returns binary data by drawing current during one or the other of the alternating-polarity pulses of a series of power pulse cycles.
REFERENCES:
patent: 4004612 (1977-01-01), Hummel et al.
patent: 6384723 (2002-05-01), Keeler et al.
patent: 6766221 (2004-07-01), Christiansen
patent: 7358626 (2008-04-01), Gardner et al.
Dalman John C.
Gardner Randall James
Heine Michael D.
IP Group, Inc.
Paladini Albert W
Rutland Wallis Michael
The Toro Company
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