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

Subject: RE: asynRecord immutable fields
From: "Mark Rivers" <[email protected]>
To: "Eric Williams" <[email protected]>
Cc: [email protected]
Date: Wed, 23 Jan 2008 12:59:26 -0600
Eric,

> I didn't think of that, but I just tried it and the results 
> are the same.

I am not sure what you my by "tried it" (using channel access?) and "the
results are the same".  The same as with the gensub record, or the same
as I reported?  Were you able to change the NOWT and TMOD fields from
channel access?

I can defintely change them from channel access, using the caget and
caput commands on Linux:

corvette> caget 13LAB:serial1.TMOD
13LAB:serial1.TMOD             Write/Read 
corvette> caput 13LAB:serial1.TMOD Read
Old : 13LAB:serial1.TMOD             Write/Read 
New : 13LAB:serial1.TMOD             Read 
corvette> caget 13LAB:serial1.TMOD
13LAB:serial1.TMOD             Read 
corvette> caput 13LAB:serial1.TMOD "Write/Read"
Old : 13LAB:serial1.TMOD             Read 
New : 13LAB:serial1.TMOD             Write/Read 
corvette> caget 13LAB:serial1.TMOD
13LAB:serial1.TMOD             Write/Read 
corvette> caget 13LAB:serial1.NOWT
13LAB:serial1.NOWT             80 
corvette> caput 13LAB:serial1.NOWT 120
Old : 13LAB:serial1.NOWT             80 
New : 13LAB:serial1.NOWT             120 
corvette> caget 13LAB:serial1.NOWT
13LAB:serial1.NOWT             120 
corvette> caput 13LAB:serial1.NOWT 80
Old : 13LAB:serial1.NOWT             120 
New : 13LAB:serial1.NOWT             80 
corvette> caget 13LAB:serial1.NOWT
13LAB:serial1.NOWT             80 

Can you do this?

> The TIME field of the asynRecord definitely shows the record is being 
> processed when I try to write the field.

Which field?

Mark

> -----Original Message-----
> From: Eric Williams [mailto:[email protected]] 
> Sent: Wednesday, January 23, 2008 12:25 PM
> To: Mark Rivers
> Cc: [email protected]
> Subject: Re: asynRecord immutable fields
> 
> I didn't think of that, but I just tried it and the results 
> are the same.
> 
> The TIME field of the asynRecord definitely shows the record is being 
> processed when I try to write the field.
> --
> eric
> 
> Mark Rivers wrote:
> > Those fields are definitely writeable from EPICS channel 
> access.  Have you tested that?
> >  
> > I can't say that I've ever tried linking to them with 
> database links, but I can't see why it would not work.
> >  
> > Mark
> >  
> >
> > ________________________________
> >
> > From: [email protected] on behalf of Eric Williams
> > Sent: Tue 1/22/2008 7:40 PM
> > To: [email protected]
> > Subject: asynRecord immutable fields
> >
> >
> >
> > I'm trying to drive a GPIB device with a genSub record through an
> > asynRecord, but I've been unable to change some of the 
> asynRecord fields
> > that I need to perform all the necessary control functions.
> >
> > In particular, I've been unable to modify TMOD or NOWT, which I've
> > linked to output fields of the genSub record.  (There are 
> probably other
> > asynRecord fields that act similarly, but these are the 
> ones I've run
> > into so far.)  Writing to AOUT works OK.
> >
> > If I link my genSub record output fields instead to "normal" records
> > (eg: longout), then the values go through just fine.  But they never
> > show up when linked to the asynRecord fields.  In contrast, 
> I'm able to
> > modify these fields through dbpf on the console.
> >
> > I've looked at the DBD file, and I'm not able to find any 
> reason why one
> > field would be writable and another isn't.  Anybody have a guess?
> > --
> > eric
> >
> > Environment:
> >
> >     linux-x86
> >     epics 3.14.9
> >     asyn 4-8
> >     genSub 4-6
> >
> >
> >
> >
> >   
> 
> 


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Re: asynRecord immutable fields Eric Williams
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Re: asynRecord immutable fields Eric Williams

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