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

Subject: Re: CSS X-Y Graph
From: Eric Norum <wenorum@lbl.gov>
To: John Dobbins <john.dobbins@cornell.edu>
Cc: tech-talk@aps.anl.gov
Date: Tue, 21 Feb 2012 16:45:17 -0800
MEDM supports variable-length waveform plots -- set the "Count Num or Channel" to the PV holding the number of points.  I usually work around the no-monitors-on-NORD problem by forward linking my waveform records to a longin record that gets its value from the waveform NORD field -- I then set the MEDM "Count Num or Channel" to that longin record -- which does post monitors on changes.  This latter problem will be moot on arrival of 3.15, of course.

On Feb 21, 2012, at 4:36 PM, John Dobbins wrote:

> Andrew,
> 
> I don't know if this matters but my waveform is actually one of the outputs of a genSub record. It has a NOVA field but I could alternately use another output as a array length indicator field.
> 
> BTW, I am also open to doing this in EDM or MEDM or ???
> 
> John Dobbins
> 
> On 2/21/2012 7:17 PM, Andrew Johnson wrote:
>> Hi Michael,
>> 
>> On 2012-02-21 Michael Davidsaver wrote:
>>> I too have had trouble doing this.  I was able to setup a rule to set
>>> the buffer size from the NORD field of a waveform record.  The result
>>> was that, when the size was reduced, the start of the waveform was
>>> removed instead of the end.  So not very useful.
>> 
>> Also note that the NORD field of a waveform record does not get monitors
>> posted on it unless there is device support that explicitly does that, so this
>> wouldn't necessarily work too well anyway (you could forward-link the waveform
>> record to a longin that reads the NORD field and use that instead though).
>> 
>> In 3.15 any device support will still be responsible for posting monitors if
>> it sets NORD, but the record and soft device support will also do it when they
>> set NORD.
>> 
>> - Andrew
> 

-- 
Eric Norum
wenorum@lbl.gov



Replies:
Re: CSS X-Y Graph John Dobbins
References:
CSS X-Y Graph John Dobbins
Re: CSS X-Y Graph Michael Davidsaver
Re: CSS X-Y Graph Andrew Johnson
Re: CSS X-Y Graph John Dobbins

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