Re: "duty cycle" records

[Rolf Keitel via Tech-talk <tech-talk at aps.anl.gov>]

Title: signature text

Hi Gerrit,

You cannot point a link field at another link field.

If you set in the second record

field (INPA, "$(CHAN)_DUTY_CYC.A")

you should get what you want. - rolf -

On 2023-11-22 8:07 a.m., Gerrit Kühn via Tech-talk wrote:

> Am Wed, 22 Nov 2023 16:23:29 +0100
> schrieb Gerrit Kühn via Tech-talk <tech-talk at aps.anl.gov>:
>
> > > You need to put PP at the end of your OUT link to force the second
> > > record to process.  
> > >         
> >       
> > Yes, that was the mssing bit. Thanks to both of you for pointing this out
> > to me.
> >       
> Last question for today (hopefully). I have these records now:
>
> ---
> record (calcout, "$(CHAN)_DUTY_CYC") {
>   field (DESC, "duty cycled output")
>   field (VAL,  "10") # 1st cycle time
>   field (INPA, "10") # cycle time
>   field (CALC, "VAL-1")
>   field (OUT, "$(CHAN)_DUTY_RESET PP")
>   field (OOPT, "Transition To Zero")
>   field (SCAN, "1 second")
> }
>
> record (calcout, "$(CHAN)_DUTY_RESET") {
>   field (DESC, "reset cycle counter")
>   field (VAL, "11")
>   field (INPA, "$(CHAN)_DUTY_CYC.INPA")
>   field (CALC, "A")
>   field (OUT, "$(CHAN)_DUTY_CYC")
>   field (SCAN, "Passive")
> }
> ---
>
> The second record gets processed when the counter in the first record
> reaches zero. However, it only resets the counter as desired when the INPA
> field in the second record is defined constant (i.e., INPA, "10" directly
> in the second record).
> My original idea as written above was to get the INPA field of the second
> record from the INPA field of the first record. However, this does not
> work. camonitor reports this as "LINK INVALID" although I can use caget on
> the reported link just fine (and get the correct value). Again, this feels
> like I'm missing a simple thing...
>
>
> cu
>   Gerrit
>

--
Rolf Keitel, Ph.D.
Researcher Emeritus
e-mail: rolf at triumf.ca
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