Experimental Physics and Industrial Control System
Hi,
I'm in the process of implementing an asynPortDriver based driver for
a USB scope (Picotech 2000 series). The driver is based on the
testAsynPortDriver example.
Since a real device is connected the driver produces waveforms, where
the length and axis ranges depend on the user settings (i.e. capture
time, sampling frequency and so on).
---
When using MEDM to display the waveform using the Cartesian plot, one
must (so I understand) adjust the 'LOPR', 'HOPR', and 'NELM' fields of
the record for the time X axis.
When taking the axis range in MEDM from the channel, then the waveform
will be clipped (when NELM is too small), or it will only occupy part of
the display (when NELM is too large).
I also tested auto-scale of the axis, but in that case also the axis
labels are never changed.
---
What is the standard procedure here? Should I use something else than
MEDM? Or is it possible to get to work by changing my code/record
database?
---
I've seen an old post using intermediate 'longout' records, but they
didn't seem to work as intended.
(https://epics.anl.gov/tech-talk/2015/msg00289.php)
Thanks
Bastian
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