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

Subject: Re: CALC record question
From: wright@luke.atdiv.lanl.gov (Rozelle Wright)
To: ajf@ast.cam.ac.uk
Cc: tech-talk@aps.anl.gov
Date: Fri, 29 Mar 96 17:09:10 MST
> 
> > From ajf@ast.cam.ac.uk Fri Mar 29 10:50:35 1996
> > Return-Path: <ajf@ast.cam.ac.uk>
> > Date: Fri, 29 Mar 1996 17:48:19 +0000 (GMT)
> > X-Sender: ajf@orc
> > To: Epics Questions <tech-talk@aps.anl.gov>
> > Subject: CALC record question
> > Mime-Version: 1.0
> > Content-Type> : > TEXT/PLAIN> ; > charset=US-ASCII> 
> > Content-Length: 1361
> > X-Lines: 39
> > 
> > 
> > Can anyone help me with the following:
> > 
> > I am trying to reset a value used in a calculation record
> > from a button on a 'dm' screen. The CALC field is set to
> > A+1 and the VAL field is looped back to INPA, so that continual
> > processing of the calculation record gives: 1, 2, 3, 4, etc.
> > 
> > I want a button on a 'dm' screen such that when it is pressed, the
> > above calculation starts again at 0. I thought this should be easy
> > but haven't managed it yet. 
> > 
> > I tried letting the button press put the
> > value 0 into INPB and changing CALC to B*{A+1} so that, 
> > normally B=1 and we have as before. When the button is
> > pressed, the record processes once with B=0 and then the
> > whole thing starts again. 
> > 
> > This doesn't work.
> > I suppose because the above means that INPB needs to take two 
> > inputs (the first, a hardwired 1, the second a 0 put into B when 
> > the button is pressed). 
> > In this case, how can the calculation record know which value it is 
> > supposed to be using? Or am I going about this in totally the wrong way?
> > 
> > Any help would be greatly appreciated?
> > 
> > Cheers,
> > 
> > Andy 
> > 
> > ===================================================================================
> > Andy Foster
> > Royal Greenwich Observatory	Tel:       44 (0)1223 374899 (direct)
> > Madingley Road			Fax:       44 (0)1223 374700
> > Cambridge			E-mail:    ajf@ast.cam.ac.uk
> > CB3 0HA				Home Page: http://www.ast.cam.ac.uk/~ajf
> > UK
> > 
> > 
> Hi Andy,
> This may work for you.  It does not require any new database records.
> 
> I am using edd/dm version 2.2.
> 
> My calculation record is called counter.
> and has the following properties.
> CALC: B?(B*(A+1)):0
> A: counter.VAL
> B: 1
> 
> I made a message button  to control counter.B.
> (titled RESET for both inactive and pressed)
> The press message is 0 and the release message is 1.
> 
> I hope this helps.
> Rozelle
> 
Something I didn't think about when I sent the first message.
If the calculation record is scanned periodically, the
reset button must be held down until the 0 value for B is seen.
Otherwise channel access will put the 1 value into B before the
record is processed and the zero will not be seen.
The reset will work immediately if the record is scanned passively.
Rozelle


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