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

Subject: RE: EPICS UIs in the context of changing enum record identifiers
From: Jameson Graef Rollins <[email protected]>
To: Mark Rivers <[email protected]>, EPICS tech-talk <[email protected]>
Date: Wed, 01 Apr 2015 11:24:52 -0700
On Wed, Apr 01 2015, Mark Rivers <[email protected]> wrote:
> One ugly solution that I have used is to only display those widgets on
> little screens that are meant to be opened temporarily and then
> closed.  Each time the screen is opened it will get the latest values
> of the enums.

Hi, Mark.  We've thought about solutions like this, but unfortunately
the users tend to leave these screens open indefinitely, which is kind
of the source of the problem.  If the users always closed the screens
after use, the menu would always be refreshed.  We would need to have
the sub-screen automatically close after the user made their selection,
but I think that would require another MEDM hack.

> The problem is not the client applications so much as it is a
> limitation on Channel Access monitor types.  See the recent tech-talk
> thread about DBE_PROPERTY subscriptions.

Yes, I was the instigator of that thread [0] as well ;) and for similar
reasons.  In that case, though, we have a custom client application
using pyepics that's been written from scratch.  I would like to avoid
writing a custom client interface in this case, though, if at all
possible, which is why I'm looking for a solution with existing
infrastructures.  Unfortunately I haven't yet figured out to get MEDM to
monitor the DBE_PROPERTY.  If anyone knows how to do that, I would love
a reference.

jamie.

[0] http://www.aps.anl.gov/epics/tech-talk/2015/msg00540.php

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Replies:
Re: EPICS UIs in the context of changing enum record identifiers Andrew Johnson
References:
EPICS UIs in the context of changing enum record identifiers Jameson Graef Rollins
RE: EPICS UIs in the context of changing enum record identifiers Mark Rivers

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