The Trend Extension monitors and records the changes in the behavior of an individual attribute over time, thereby assisting you with diagnosing various system-wide behavioral characteristics. The Trend extension collects sample values at timed intervals or only upon changes in the given value. Trend data is still collected if the object is unreliable.
In the BCPro system, Trend extensions are only available to the BACnet Router or Modbus Gateway device objects. Data that you might want to collect from these devices includes memory usage data and battery condition alarm.
For general information on BCPro system objects, see the Object Help section.