Data communication in a multi-wire irrigation control system
First Claim
1. A method for use in an irrigation system, the method comprising:
- receiving an alternating power signal comprising cycles each having a first leading portion and a following portion, wherein the first leading portion and the following portion are either both on a high side of a cycle or both on a low side of a cycle of the alternating power signal;
demodulating data represented by the alternating power signal based upon whether the first leading portion of a cycle of the alternating power signal has an amplitude that is distorted and where the following portion has an amplitude that is undistorted; and
deriving power from the alternating power signal to charge an energy reserve associated with each of a plurality of irrigation devices.
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Accused Products
Abstract
An irrigation control device having a modulator that modulates data onto an alternating power signal by distorting amplitude of a first leading portion of selected cycles of the alternating power signal, and permit effectively a full amplitude of the alternating power signal on a following portion of the selected cycles, wherein the first leading portion and the following portion are either both on a high side of a cycle or both on a low side of a cycle of the alternating power signal. The irrigation control device further includes an interface configured to couple the modulator to a multi-wire interface coupled to a plurality of irrigation devices to permit the alternating power signal to be applied to the multi-wire interface.
169 Citations
11 Claims
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1. A method for use in an irrigation system, the method comprising:
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receiving an alternating power signal comprising cycles each having a first leading portion and a following portion, wherein the first leading portion and the following portion are either both on a high side of a cycle or both on a low side of a cycle of the alternating power signal; demodulating data represented by the alternating power signal based upon whether the first leading portion of a cycle of the alternating power signal has an amplitude that is distorted and where the following portion has an amplitude that is undistorted; and deriving power from the alternating power signal to charge an energy reserve associated with each of a plurality of irrigation devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for use in an irrigation system, the method comprising:
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receiving, at an irrigation device, an alternating power signal comprising cycles, where an amplitude of a portion of each cycle is selectively distorted to modulate data on the alternating power signal; determining a slope of the portion of each cycle; and demodulating the data based upon the determining the slope. - View Dependent Claims (10, 11)
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Specification