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Subject: Re: Use default value if CA link error
From: Maurizio Montis <Maurizio.Montis@lnl.infn.it>
To: Luca Cavalli <LCavalli@cgspace.it>
Cc: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Mon, 5 Jun 2017 12:20:43 +0200 (CEST)
Dear Luca,

the IVOA/IVOV mechanism should be the correct way to solve your problem,
no need of external modules.

* IVOA (Invalid Output Action) selects what to do in case the record
gets INVALID.
* IVOV (Invalid Output Value) is a CONSTANT holding the value that
should be used when the record is INVALID.

The connection going down should always put the record in LINK INVALID.

I had a similar situation and Ralph Lange pointed me to this solution
(thanks a lot Ralph!).

Cheers,

- Maurizio





On Jun 05, 2017 11:52 AM, Luca Cavalli <LCavalli@cgspace.it> wrote:

> Dear all,
> 
> I have a string input record which value is retrieved via CA link.
> When remote
> PV is not available (e.g. missing IOC) I would like to set "EMPTY" as
> string
> input value.
> 
> My idea is to use scalcout record from synApps with CA link connected
> to INAA
> and IAAV connected to INPA, defining the output by checking INPA value
> and
> selecting INAA (Ext PV OK) or "EMPTY" constant (Ext PN NC).
> 
> Before adding scalcout record to my IOC I would like to know if this
> is a good
> approach. Is there a simpler solution?
> 
> Thanks,
> 
> Luca
> 
> 
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~~ Maurizio Montis - Control System Engineer ~~
   office: +39 0498068558
   mobile: +39 3408428089
   mail: maurizio.montis@lnl.infn.it
   skype: maurizio_montis

Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali di Legnaro
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Replies:
Re: Use default value if CA link error Luca Cavalli
References:
Use default value if CA link error Luca Cavalli

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