Need to compare your readings from one sensor to a baseline or background data from another? Referencing devices allows you to create variable or reference points from parameters monitored by 1 or more device using statistical functions over a given time period. In older versions of Environet, you would have to create a reference, but now you can just add the reference directly into the alert!

From the Alerts editing page, you have the option to select either a Device or Function. By selecting a Function, a more complex alert setup will open.
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Each function will have different fields to fill out. In the example above you can see Maximum was selected which needs a device, parameter, and time period. Then, after that function has been set, you can select the comparator and value as normal. You can also continue to add additional conditions with the AND/OR logic to specify your alert even further.

Below is another example where we use a different function (A video guide of this example is also shown at the bottom of this page). We can use the Difference function to set up an alert for when Office 2 is 10 degrees hotter than Office 3. We select Office 2 first and Office 3 second because the function simply subtracts (Office 2 - Office 3). Then set the parameter for each to Temperature. We then complete the condition with the Greater Than or Equal To comparator and 10 (indicating that Office 2 is 10 degrees hotter than Office 3).

In this Alert, If both offices are the same temperature, we will get zero. When Office 2 is hotter than Office 3, we will get a positive number. If Office 3 is hotter than Office 2, we will get a negative number.
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Think of the equation as:

Event - Baseline ≥ Threshold
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​Example:
​Office 2 Temp - Office 3 Temp ≥ 10°F
Office 2: 82° F
Office 3: 72° F
82 - 72 = 10
10 ≥ 10° F
The alert is triggered because the result is positive 10.
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Minimum (MIN): Returns the minimum value over the rolling time period.
​Maximum (MAX): Returns the maximum value over the rolling time period.
​Average (AVG): Returns the average over the rolling time period (moving average).
​Difference (DIFF): Returns the difference between device 1 and device 2.
​Absolute Value (ABS): Returns the absolute value of a reference

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Choose a time periods between 5 minutes and 1 month for the Min, Max and Average functions. The available intervals are:

These functions are similar to the Statistics you can add when configuring your device.