Two-wire power and communications for irrigation systems

Electrical transmission or interconnection systems – Plural load circuit systems – Selectively connected or controlled load circuits

Reexamination Certificate

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Details

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.

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