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










Image Number 8 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
System and method for creating a build set and bill of materials from a master source model
Method for fabricating solar cell
Acceleration based mode switch
Antibodies to OX-2/CD200 and uses thereof
Media processing method and device
Ranging method and apparatus in passive optical network
Method for adapting a contact point of a clutch in a drivetrain of a motor vehicle
  Randomly Featured Patents
Composition and method for treating bacterial infection
Finding the direction of a sound
Method and apparatus for randomly reading waveform segments from a memory
Support frame for making furniture
Analog video tagging and encoding system
Torque sensing drive
Seal for a food container
Apparatus for treating wells
Child monitoring device with strap
System, method, and apparatus for accessing outlets in a two-stage diverter spool assembly