How to implement COV(Change of value) function in BACnet MS/TP and BACnet IP in M172 HVAC controller?

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I want to implement COV in BACnet MS/TP and BACnet IP in M172 HVAC controller. I check manual didn't get much about function COV (Change of value). I have created analog input variable below is the code for the same. Kindly provide the solution for implementation of COV Attribute.

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How to implement COV(Change of value) function in BACnet MS/TP and BACnet IP in M172 HVAC controller?

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