AW: A general question about convert e.g. in longout record drvh, drvl handling

["Zimoch Dirk \(PSI\) via Core-talk" <core-talk at aps.anl.gov>]

One could of course change the check to
if ((prec->drvl !=0 || prec->drvh !=0) && prec->drvh > prec->drvl) 
But then in ao as well.

It would change traditional behavior (which used to be documented wrongly in earlier EPICS releases) and potentially break existing IOCs where people use DLRH = DRVL != 0 and expect the limits to be ignored. It would also introduce a new "special case" because the record can then be fixed to any value except 0. Another option is to change the defaults from 0,0 to -verybig,+verybig.

I think a poll would be needed.

Dirk


> -----Ursprüngliche Nachricht-----
> Von: Core-talk <core-talk-bounces at aps.anl.gov> Im Auftrag von Heinz Junkes
> via Core-talk
> Gesendet: Mittwoch, 27. Januar 2021 12:53
> An: Ralph Lange <ralph.lange at gmx.de>
> Cc: EPICS Core Talk <core-talk at aps.anl.gov>
> Betreff: Re: A general question about convert e.g. in longout record drvh, drvl
> handling [signed INVALID]
> 
> Yes, the Idea with DOL/OMSL is a good one ;-)
> 
> And thanks for the clear answer about drvl = drvh = 0.
> Unfortunately I had not thought of that at that moment. Makes total sense.
> 
> But maybe it would be worth to exclude the "0" (default) in the convert
> or to give a warning when loading the db file with DRVH = DRVL (!0)?
> 
> Viele Grüße
> Heinz Junkes
> --
> Experience directly varies with equipment ruined.
> 
> 
> 
> > On 27. Jan 2021, at 12:08, Ralph Lange via Core-talk <core-talk at aps.anl.gov>
> wrote:
> >
> > On Wed, 27 Jan 2021 at 11:56, Heinz Junkes via Core-talk <core-
> talk at aps.anl.gov> wrote:
> > I have defined a longout record and wanted to achieve that you can set
> exactly only one value.
> >
> > Wouldn't a constant DOL and OMSL set to supervisory achieve that?
> >
> > Cheers,
> > ~Ralph
> >