Experimental Physics and
Industrial Control System

"Denison, PN (Peter)" <[email protected]> · Thu, 24 Apr 2008 16:42:05 +0100

> From: [email protected] 
> [mailto:[email protected]] On Behalf Of J. Lewis Muir
> Sent: 24 April 2008 16:12
> 
> On 4/24/08 10:53 AM, John Dobbins wrote:
> > 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.
> 
> 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?

It has indeed been fixed in the CVS repository of base, and will be in
the next released version (R3.14.10)

However, there is a way if fixing it in the meantime: 

Take the corrected subArrayRecord.c from
http://www.aps.anl.gov/epics/tech-talk/2007/msg01483.php, put it in a
<top> structure (I can give you a ready-made tarball if you like) and
then (from our release notes)

"To use the corrected subArray record, add the path to this module into
<TOP>/configure/RELEASE in your application, and in
<TOP>/...App/src/Makefile,
put:
..._LIBS += subArray
before the line which adds the base libraries,
(..._LIBS += $(EPICS_BASE_IOC_LIBS)"

The libraries take effect before the base libraries, and so will
override the behaviour in base. This technique can be used to override
any part of base, should you so wish. (Danger Will Robinson!)

-- 
Peter Denison, Senior Software Engineer, Diamond Light Source Ltd.
Tel: +44 1235 778511
(apologies in advance for the lines below. Some bits are a legal
requirement and I have no control over them)

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System