This OPC UA Property, of DataType BACnetDeviceObjectPropertyReference, represents the BACnet property Setpoint_Reference. The BACnetDeviceObjectProperty Reference DataType is defined in 10.5.9. The value 4194303 is used as objectIdentifier to indicate that the property is not initialized.
This property represents either zero or one reference. If the reference is zero, then the setpoint for this control loop is fixed and is contained in the Setpoint property. The presence of a reference indicates that the property of another object contains the setpoint value used for the Loop object and the reference specifies that property.