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
Display screen of a mobile terminal or portion thereof with a graphical user interface
Dynamic lookup service in a distributed system
Code reading apparatus, sales registering apparatus, and sales registering method
TV wall mount
System and method for optimizing utilization of inventory space for dispensable articles
Classifying documents using multiple classifiers
Dynamic data caches, decoders and decoding methods
  Randomly Featured Patents
Method of manufacturing a bipolar transistor
Electronic transaction processing system and method for operating same
Process for the preparation of pyrazoles
Transfer printing process for dyeing and printing organic material which can be dyed with cationic dyes
Electrical coil and terminal with clip
Wrist-borne exercise display device
Processing asphaltene-containing tailings
Apparatus for air conditioning an electric vehicle
Open end yarn spinning apparatus
Method of producing a response