Overview of the Maxicom
2
System
The Maxicom
2
Central Irrigation System uses a central computer to send
irrigation schedules and other data via telephone lines, cellular telephone,
hardwire, point-to-point radio, trunk radio, or fiber optics to Central Control
Units (CCUs) in the field.
A CCU communicates with up to 28 satellite controllers through a two-wire path
or wireless radio link. The CCU monitors field conditions and reacts to problems
such as excessive flow. When necessary, the CCU selectively turns off all or
portions of a site’s irrigation system. The CCU also reads and reacts to moisture
sensors, wind sensors, and rain gauges. In this way, multiple remote sites can be
controlled and monitored from a single central location at your personal
computer.
The Maxicom Central Control System chiefly consists of seven parts. (See the
illustration on the opposite page.)
1
Central Computer — uses the Maxicom
2
software program to control the
entire irrigation system.
2
Computer to CCU or computer to weather source data path — transfers
information from the central computer to the CCU or weather source by
phone communication or by radio/direct communication.
3
Central Control Unit — operates field devices by executing commands
received from the central computer.
4
Satellite data path — transfers information from the CCU to the field devices
by a two-wire path or wireless radio link.
5
CCU-based field devices — include satellite controllers, decoders, or sensors:
satellite controllers send a 24 VAC power signal to each station;
decoders control and monitor system functions;
sensors monitor conditions in the field.
6
Stations — consist of irrigation valves, sensors, or switch-operated devices.
7
Weather source/ET — interprets weather conditions and/or
evapotranspiration (ET) information and sends that information to the central
computer.
Introduction
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