Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Two-wire power and communications for irrigation systems










Image Number 3 for United States Patent #7358626.

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.








 
 
  Recently Added Patents
Fire detector
Method for identifying bacteria in a sample
Curable inks comprising surfactant-coated magnetic nanoparticles
Data processing apparatus including reconfigurable logic circuit
Information processing apparatus and storage medium for storing information processing program
Systems and methods for providing power and data to lighting devices
Specializing disambiguation of a natural language expression
  Randomly Featured Patents
Automatic self-cooling device for beverage containers
Liquid electrophotographic image forming apparatus having a liquid carrier depositing unit
Apparatus for separating engine crankcase portions and method for same
Toilet caddy
Method and apparatus for measuring a parameter during the transport of objects to a processing device
Process for the fabrication of epitaxial layers of a compound semiconductor on monocrystal silicon and light-emitting diode fabricated therefrom
Ventilated cushions
Drawing head for ribbon type optical cables equipped with respective end connectors
Textile coating and method of using the same
Gas discharge display device with an auxiliary anode control plate