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<== Date ==> <== Thread ==>

Subject: Re: Problem with AreaDetector and Eiger External Series?
From: Bruno Martins via Tech-talk <tech-talk@aps.anl.gov>
To: Matt Newville <newville@cars.uchicago.edu>
Cc: EPICS Tech Talk <tech-talk@aps.anl.gov>
Date: Wed, 26 Jun 2019 13:33:39 -0400
It has been a while that I wrote it, so my memory might be faulty, but this is what I remember:

SIMPLON 1.6 does not disarm the detector automatically, so the series_*hdf5 files in the server will not be ready to be downloaded, which means that the IOC can't know how many external triggers there were already.

You might be able to get around this by setting the number of images per file to be a factor of your total acquisition frames (so, say, images/file=10 when total frames=100), but I'm not 100% sure that the very last file will be ready on the Dectris server without an explicit 'disarm'.

Bruno


On Wed, Jun 26, 2019 at 1:20 PM Matt Newville via Tech-talk <tech-talk@aps.anl.gov> wrote:
Hi Jesse, 

On Wed, Jun 26, 2019 at 10:08 AM Jesse Hopkins via Tech-talk <tech-talk@aps.anl.gov> wrote:
Hi,

We have an Eiger X 500K. I'm using AreaDetector to control it, and encountering a strange issue with the External Series trigger mode. I set the trigger mode to external series, and 'Start' collection. If I then send an external trigger, the series collects as expected. I can watch NumImagesCounter_RBV increment, and it reports the right number of images collected. However, after all the images are collected, Acquire stays 'Collecting'. In order to take another series I have to first click the 'Stop' button. Additionally, the StatusMessage_RBV stays as 'Waiting for external trigger' until I click the 'Stop' button.

This is in contrast to the Internal Series behavior, where at the end of a series Acquire goes to 'Done' as I would expect.


Yes, we see the same behavior for our Eiger 500K in either External Enable and External Series modes: we have to explicitly stop the detector.   To be clear, if we set NumTriggers to 10 and send it 20 pulses, it will count up to 10 triggers.  Any file writing or processing plugin will only get 10 frames.  But the detector will still be in Acquiring Mode and (using ADCore 3.5.0) the StatusMesssage says
     Waiting for external triggers (press Stop when done)

But like you see, we have to explicitly stop the detector to be able to then restart it.

--Matt Newville


Replies:
Re: Problem with AreaDetector and Eiger External Series? Mark Rivers via Tech-talk
References:
Problem with AreaDetector and Eiger External Series? Jesse Hopkins via Tech-talk
Re: Problem with AreaDetector and Eiger External Series? Matt Newville via Tech-talk

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