Group structure

• One or more groups corresponding to Configure/Unconfigure transitions. Typically there will be only one Configure transition per HDF5 file, so there will be only one "Configure" group.
• Zero or more child groups inside a "Configure" group corresponding to BeginRun/EndRun transitions.
• Zero or more child groups inside a "Run" group corresponding to BeginCalibCycle/EndCalibCycle transitions.
• Zero or more child groups inside "CalibCycle" group corresponding to the data objects appearing inside L1Accept transitions.

/Configure:0000

    |

    +- Run:0000

    |    |

    |    +- CalibCycle:0000

    |    +- CalibCycle:0001

    |

    +- Run:0001

         |

         +- CalibCycle:0000

         +- CalibCycle:0001

/Configure:0000/Bld::BldDataEBeamV3/EBeam/

/Configure:0000/CsPad::ConfigV4/CxiDs1.0:Cspad.0/

/Configure:0000/Run:0000/

/Configure:0000/Run:0000/CalibCycle:0000/

/Configure:0000/Run:0000/CalibCycle:0000/Bld::BldDataEBeamV3/

/Configure:0000/Run:0000/CalibCycle:0000/Bld::BldDataEBeamV3/EBeam/

/Configure:0000/Run:0000/CalibCycle:0000/CsPad::ElementV2/

/Configure:0000/Run:0000/CalibCycle:0000/CsPad::ElementV2/CxiDs1.0:Cspad.0/

Time dataset

• seconds – whole seconds part of the timestamp
• nanoseconds – nanoseconds (range 0-999999999) part of the timestamp
• fiducials – fiducials counter for the event
• ticks – 119MHz counter within the fiducial
• vector – event counter since Configure (not necessarily in increasing order)
• control – EVR event code

From: https://confluence.slac.stanford.edu/display/PSDM/The+contents+of+HDF5+files