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Glossary
Circuit board
One of the etched, copper clad sheets of insulating material onto which electronic
components and terminals are assembled. Controllers contain circuit boards.
Controller
A device that sends a 24 VAC power signal to the field solenoid valves.
CPU board
The central processing unit circuit board inside the controller.
Default setting
The start-up settings for the controller. The default settings cannot be changed.
ESP-MC
Extra Simple Programming — MAXICOM Compatible series, an 8, 12, 16, 24, 32, or
40 independent station controller that is a stand-alone unit, but is upgradable to a
satellite controller linked to MAXICOM.
GPM
Gallons per minute.
Hardwire
Communication cable used to transmit data between devices.
Liquid crystal display (LCD)
The illuminated display used on the faceplate of most controllers.
Manual
Requires user input, rather than being automatically performed by the PC program.
Master valve (MV)
An electrically operated valve located on a system’s main line that controls the flow of
water to all other electric and manual valves downstream of it.
Master valve circuit
An electrical circuit located on many controllers used to control a master valve. Re-
gardless of what station is on at the controller, the master valve circuit produces volt-
age to control the master valve. When all of the stations on the controller are off, the
master valve circuit turns off.
Monitor
To observe conditions in and around the irrigation system and send the information to
the different components in the system for appropriate action.
Satellite
A controller in the field capable of communicating with the Cluster Control Unit (CCU).
Satellite controller
Same as satellite.
Sensor system
An optional addition to the controller that disables watering. Examples are the Rain
Bird Aquamiser, Intellisense, Rain Check, and Rain/Freeze Check.
Site
A single, remote irrigated area controlled by a CCU. For example, one park is a site in