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- By opening a graph - the D2000 HI process automatically generates requests to read all the values displayed in the graph.
- By opening a picture in history mode.
- By actions for reading from the archive: GETARCHVAL, GETARCHARR, GETARCHARR_TO_CNT, GETARCHROW, GETARCHCOL and GETARCHSTRUCT.
- By requesting historical values from outside the D2000 system:
- Reading via the D2000 Gateway from another D2000 system as a response to the GETOLDVAL command.
- Reading via D2000 Kom process (server protocols, e.g. IEC 870-5-104 Server).
- Reading via D2000 OBJApi function GetArchivData.
- Reading via D2000 VBApi (from Microsoft Visual Basic or Microsoft Excel programs) with functions VBApiGetArchData (simple historical value) or VBApiGetArchDataItem (item of a structured historical value).
- Reading via D2000 Java API.
- Reading via D2000 ODBC driver,
- Reading via D2000 REST API.