DAQ-scan variable (where things like motor positions are changed during a run in "steps" or "calibcycles") can also be accessed used the Detector interface. This example is in /sdf/group/lcls/ds/ana/tutorials/psana1_examples/controlData.py.
from psana import * ds = DataSource('exp=xpptut15:run=200:smd') cd = Detector('ControlData') for run in ds.runs(): for nstep,step in enumerate(run.steps()): pvList = cd().pvControls() for pv in pvList: print (f'Step: {nstep}, name/value: {pv.name()}/{pv.value()}') for evt in step.events(): pass if nstep>=2: import sys sys.exit()
References
- ControlDataDetector - documentation of the ControlDataDetector methods
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