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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 16:54:12 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
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> 
> 
> 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


---------------------------------------------------------
|                                                       |
|Rozelle Wright              Phone (505) 667-4804       |
|Los Alamos Natl Labs AOT-8  FAX (505) 665-5107         |
|PO Box 1663 MS-H820         Group Office (505) 667-6087|
|Los Alamos, NM 87545        email : rwright@lanl.gov   |
|                                                       |
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