The CMS data logging service is available to clients using the IAP/REST API. You can configure it using the Datapoint Properties widget and also access it through the BACnet client workstations using the SmartServer BACnet Server Trend Log object.
The BACnet Trend Log object is created for each datapoint instance index of the specified datapoint in BTM. The BTM file Trend Log column specifies whether the Trend Log object is needed.
The BACnet Trend Log object requires access to data log records where a data log contains historical data for a single datapoint. Each Trend Log object has its own data log with a unique data_log_id.
When a new Trend Log object is created, the CMS automatically enables monitoring and logging.