OPC historical data access part of quality ID as strings
QStr = opc.hdaQualityString(IDs)
QStr = opc.hdaQualityString(IDs) converts the HDA portion of the OPC quality IDs in IDs.
If IDs is a vector, QStr is a cell array of strings, the same size as IDs.
Load the OPC HDA example data file and find the HDA qualities of the time stamp union of hdaDataSmall:
load opcdemoHDAData; newObj = tsunion(hdaDataSmall); hdaQStr = opc.hdaQualityString([newObj.Quality]);