Experimental Physics and
Industrial Control System

"J. Lewis Muir" <[email protected]> · Wed, 20 Aug 2008 15:37:37 -0400

On 8/20/08 3:00 PM, Carl Schumann wrote:
> Hi,
> 
> The E in EDM stands for extensible as I understand it.   There are two
> ways that I could think of a display manager(DM) being extensible:
> 1. extending the widget set
> 2. extending the set of PVs/data acquisition protocols supported by the DM
> My interest is doing the later without having to reimplement a whole new
> widget set as well.
> 
> We have users (mostly physicists and engineers but not programmers)
> doing development with EDM (and EPICS) that are unable to access useful
> machine parameters that are currently only available through ACNET.  
> Here at FNAL we will probably never be an exclusively EPICS
> installation, because of the volume of machine parameters that are
> instrumented via home-grown ACNET.   I would like to extend EDM so that
> it can display legacy ACNET machine info in addition to EPICS machine
> info.   It would appear this would be possible at some level, since it
> appears EDM already supports EPICS and CALC PVs.   Is it
> reasonable/possible to extend EDM to support other "PV"s besides EPICS
> and CALC?   What is not clear so far to me is how much coupling there is
> between the widget set and the PV implementations.   Assuming I can
> develop an ACNET PV for EDM, would I also need to develop an ACNET
> widget set?
> 
> Thank you for your time.
> 
> Sincerely,
> Carl Schumann

Hi, Carl.

I can't answer your EDM questions, but depending on your needs, another
approach might be to write an ACNET PV Adapter that would adapt the
ACNET PV interface to an EPICS PV interface thus allowing you to use the
existing EDM support for EPICS PVs.  I'm not suggesting this is the way
to go, but depending on what you need, this might be another option to
consider.

Lewis

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System