Experimental Physics and
Industrial Control System

"Gillingham, IJ (Ian)" <[email protected]> · Thu, 24 Apr 2008 16:24:47 +0100

Peter Denison at Diamond has provided a work-around for our systems (it
was giving us some real headaches!) He managed to lift it out of EPICS
base and created a subArray support package, which if loaded before
EPICS base, would ensure correct behaviour (we're using R3.14.8.2).

I suggest you contact Peter for further details - I believe it was
relatively straight forward.
(Maybe, when you read this Peter, you may consider posting the method to
tech-talk??)

Ian

Ian Gillingham,
Diamond Light Source

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of J. Lewis Muir
Sent: 24 April 2008 16:12
To: [email protected]
Subject: Re: sub-array question

On 4/24/08 10:53 AM, John Dobbins wrote:
> Dear All,
> 
> I have a waveform record which reads consecutive values from hardware
> memory (happens to be Modbus over ethernet). I then use a subArray
> record to pick out individual values. However if the hardware goes
> off-line (so the waveform is temporarily invalid) the subArray record
> changes its INDX field to 0! When the hardware comes back on-line the
> subArray record now points to the wrong location in the waveform.
> 
> Is this intended? Suggestions for avoiding this situation?

Hi, John.

I reported the same problem last year.  An archive of the discussion is
at

  http://www.aps.anl.gov/epics/tech-talk/2007/msg01432.php

I wish the fix could go into an earlier version of EPICS base, but maybe
Andrew is concerned about changing the behavior and thus possibly
breaking existing databases?

-lewis

-- 
J. Lewis Muir
Software Engineer
IMCA-CAT/CARS
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System