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










Image Number 6 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
Titanium compounds and complexes as additives in lubricants
Community profiling for social media
Piezoelectric ultrasonic transducer apparatus
Luggage wheel housing with wheel
Image forming apparatus and method for making density correction in a low resolution image based on edge determination
Toy track intersection component
Wireless updating of hearing devices
  Randomly Featured Patents
Method and apparatus for laser beam drift compensation
Rotary torsion cutting apparatus
Aerosol dispenser with ultrasonically welded closure and method of making
Control method and apparatus for embedding information in data
Method and system for setting cardiac resynchronization therapy parameters
Silicon-doped titanium wetting layer for aluminum plug
Bicycle speed change lever assembly
Adjust and lock artificial hip cup
Method of circuit optimization utilizing programmable sleep transistors
Sol-gel process for glass and ceramic articles