SysAdmin/Calculated-Fields.md

@@ -53,11 +53,19 @@ To provide this addtional information, a special Calculated Field function is pr
 
 [[images/calc_ex3.png]]
 
-The `Unit` entry generally should be `runtime: Runtime Fraction`.  `runtimeFromOnOff` must be entered as the `Transform or Calculated Field Function Name`.  Finally, you need to provide the Sensor ID of the sensor that records the precise On and Off times (that sensor needs to report a value of 1 when the device turns on and a value of 0 when the device turns off).  That Sensor ID is entered as the `onOffID` parameter in the `Function Parameters` box:
+The `Unit` entry generally should be `runtime: Runtime Fraction` or `fraction: Occupied Fraction`.  `runtimeFromOnOff` must be entered as the `Transform or Calculated Field Function Name`.  Finally, you need to provide the Sensor ID of the sensor that records the precise On and Off times (that sensor needs to report a value of 1 when the device turns on and a value of 0 when the device turns off).  That Sensor ID is entered as the `onOffID` parameter in the `Function Parameters` box:
 
     onOffID: 29631
 
-In this example, the Sensor ID is `29631`, an ID of a Monnit Dry Contact sensor.  This special runtime function is also useful with Motion or Occupancy Sensors and 1-wire Motor Sensors used with the [[Mini-Monitor]].
+In this example, the Sensor ID is `29631`, an ID of a Monnit Dry Contact sensor.  By default, this function will calculate the runtime fraction for every half-hour interval.  If you would like to use a different interval, add a second line to the `Function Parameters` box.  For the above example, the following would be the entry for calculating 15 minute runtime fractions:
+
+    onOffID: 29631
+    runtimeInterval: 15
+
+This special runtime function is also useful with Motion or Occupancy Sensors and 1-wire Motor Sensors used with the [[Mini-Monitor]].
+
+
+
 
 ## Entering Sensor IDs for Calculated Fields