Most of the alerts available are driven analog values. Each check box is followed by an indicator (>) or (<). If an alert has a (>) indicator, this means that the current weather station monitored value must be greater than or equal to the trigger value to be active. If an alert has a (<) indicator, this means that the current weather station monitored value must be less than or equal to the trigger value to be active.
What is the Reset value?
The Reset value is used to prevent continual alerts due to small fluctuations in the current weather station monitored value.
Take for instance, the High Outdoor Temperature (>) alert. If we set a trigger value to 70.0 and the monitored value is fluctuating from 69 to 71, we do not want the alerts to be issued over and over. To prevent this the Reset value is used to provide a “dead-band”. For instance, if I set the High Outdoor Temperature (>) trigger to 70, and the Reset to 60, the alert will only be issued once when the temperature rises to 70 and will not become active again until the temperature has dropped to 60 or below.
The meaning of the Reset value is opposite when used with an alert followed by a (<) indicator. For instance, if we set the Low Outdoor Temperature (<) alert’s trigger to 10 degrees, and we use a reset of 20 degrees, the alert will be issued once when the temperature drops to 10 degrees or below. The alert will not be re-issued until the temperature rises to 20 degrees or higher.
Triggering versus active alert
When an alert is triggered, the action associated with that alert is executed and the audible associated with that alert is played.
As long as the condition is true, the audible will be played for the specified duration. For instance, if you have specified 10000 in the repetitions edit box, as long as the condition is still true, the audible will be played 10,000 times! In other words, the duration is simply used to limit the number of times the audible is heard when the alert is active.
The action is only executed once until the condition is ‘Reset’. As mentioned in the example above, the action will not be executed again until the Low Outdoor Temperature (<) rises to at least 20 degrees then falls back to less than 10 (10 is trigger value, 20 is the reset).