DAVIS WeatherLink Irrigation Add. - Manual (Page 8)

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will be depressed to indicate Closed circuit mode and raised to indicate Open
circuit mode. To utilize this function effectively, you will need to connect a
device to the appropriate output so that you can tell whether it is turning on
or off.
You can connect a voltmeter or continuity tester to the outputs and see if the
output changes state (high for closed or low for open). You may also
connect your irrigation controller to one or more of the outputs. If you utilize
Industrial mode, check to see that the controller receives the data correctly
(Rain, ET and/or Wind pulses). If you use Residential mode, put your
controller in manual mode and run the sprinklers and check to see that the
sprinklers run when the ET circuit is closed and doesn’t run when the ET
circuit is open. Additionally, if you wire the alarm circuit to the irrigation
controller, you can check to see if the sprinklers run with the Alarm circuit
closed or fail to run with the Alarm circuit open. When wired in series with
the ET function either the ET function or the Alarm function should cause
the same behavior when either of the circuits is closed (or open). When
wired in parallel, both circuits must be closed (or open) to cause the same
behavior.
To leave this mode, simply exit the dialog box by pressing the OK button.
You must hit OK in the main dialog box to return the datalogger to its
original settings.
Default
Press this button to restore the data entries to their default values. You must
still hit OK to save the settings in the data logger.
Residential Configuration
This function is designed to inhibit the irrigation cycle when sufficient
rainfall and/or irrigation has occurred to make up for any ET loss over the
past irrigation cycle. In this mode, the Irrigation data logger calculates Rain
minus ET every cycle to get the net result, much like balancing a checkbook.
In this manner, Rain can be thought of as deposits, and ET as withdrawals.
However, unlike a checking account, this number can run negative. In this
case, deposits of rain from irrigation need to be entered to make the net
balance zero again. The Irrigation Amount you enter into the dialog box (see
below) is applied at the end of each cycle when the data logger allows the