DAVIS WeatherLink Addendum page 17

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Missing: This is used to check whether a given parameter is missing or
invalid.
Finally, choose your Logical Grouping (whether you want to test this
condition along with any other conditions).
Choose DONE if this is the only condition you want to check. Choose OR if
you want this condition or any of the other conditions you set to trigger an
alarm. Choose AND if you require this condition and all of the other
conditions you set be present to trigger an alarm. Choose XOR if you want
an alarm to trigger if only one of the conditions you are checking becomes
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