Ian wrote:
>
> I have a few problems with edd/dm. I know that there has been talk about
> this before, but I didn't find much in the archives. Perhaps someone
> could remind me. Dm is losing contact with variables in epics
> and the strip chart is terrible, sometimes it doesn't start,
> if it does it doesn't last long, and sometimes it suddenly starts for a
> brief period. Sound familiar? My Edd is at v 1.16 and the record
> attached to the strip chart has the MDEL field to -1.
>
I've asked Ian for more information to try and diagnose the problem
of dm losing contact with variables. I thought I should respond
globally to the strip chart question since it may be useful to others.
From the description, it sounds as though the strip chart is only
changing when it gets a monitor (as would be expected from the way
the strip chart works.)
Even if the .MDEL field is set to -1, the chan will still only update
regularly if the record is processed regularly, i.e. periodic or
processed from the FLNK of another chan that is processed regularly.
We have used a trick before to cause updates: create a soft chan
that updates periodically, but has constant value such as 0.0.
In edd, enter this chan as the first in the strip chart. Then enter
the real chan(s) in the strip char in edd as "F <channame>". If one
channel actually has regular monitors and all others are "Filled",
the strip chart will update. Using the extra chan is useful to
eliminate the need to process the real data channels just to get the
info on the strip chart. (This also avoids having all dm objects that
reference the real channel update unnecessarily.)
The plot package is the one used by the archiver. Unfortunately, it
is based on the notion of "synchronous" data which is a throwback
from the accelerator project for which it was designed (GTA, for
those of you who know the EPICS history.) The "F " prefix indicates
to "fill" the data for that chan , i.e. use the last data gathered for
that chan regardless of whether it has changed since the last point.
As Bob stated, the plots are horrible. It is our intent to create a
new plot package, but currently we have no funding to do this.
I apologize for any confusion or frustration strip charts and plots may cause
any of you.
Deb
**********************************************************************
Deb Kerstiens [email protected]
Phone (505)667-3396
LANL AOT-8,MSH820 PO Box 1663, Los Alamos, NM. 87545
**********************************************************************
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