A system for acquisition and storage of data relative to BACnet objects of a BACnet standard HVAC system having a BACnet network, where BACnet objects each generate change data upon occurrence of a change in a value thereof and a controller receives and concatenates the change data of the plurality of BACnet objects into payloads encapsulated into system specific data packets conforming to the BACnet data packet standards and transmitted over the BACnet network. The system also has a data conversion unit receiving the system specific data packets, retrieving the change data therefrom and generating database write commands including the change data. The system also comprises a main data acquisition database in data communication with the data conversion unit and receiving the database write commands therefrom. The main data acquisition database stores the data relative to all data changes of the standard BACnet objects over time.
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