DAVIS WeatherLink Irrigation Add. - Manual (Page 11)

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minutes. If you want your irrigation system to immediately stop watering
whenever any rain occurs, set the Rain Rate Cut-Off value to 0.01” (0.1 mm)
(see below). Note that 0.02” or 0.4 mm of rain must accumulate before a
rain rate is calculated.
Irrigation Connector Block Installation
For an Industrial installation, connect the Wind, Rain, and ET connections to
the corresponding connections (if available) on the Industrial Irrigation
Controller. Consult the Controller’s manual for details. The wind output
generates a frequency equal to the wind speed in mph over a 2 second period.
Thus, the frequency in Hz is half the wind speed. The rain output generates a
pulse for every tip of the rain collector, which will either be 0.01” or 0.2 mm
depending upon the rain collector type. Consult your Vantage Pro Console
Manual for details. ET output generates a pulse for every 0.01” of ET.
To use the Residential function, connect the ET connection of the irrigation
connector block to the Rain Sensor or in series with Common connection on
the Irrigation Controller.