Re: Use default value if CA link error

[Maurizio Montis <Maurizio.Montis@lnl.infn.it>]

Hi Luca,

if I don't make a mistake, you can use the DOL/OMSL fields in order to
read the desired value from your CA link using the stringout record.

Hope this helps,

- Maurizio


On Jun 05, 2017 12:41 PM, Luca Cavalli <LCavalli@cgspace.it> wrote:

> Hi Maurizio,
> 
> this seems a much better approach.
> I have a stringin record with INP field getting PV from CA link, but
> it is missing IVOA/IVOV fields (available in stringout).
> I can switch to stringout but how can I retrieve my PV value via CA
> link?
> 
> Thanks again,
> 
> Luca
> 
> On Mon, 2017-06-05 at 12:20 +0200, Maurizio Montis wrote:
> 
> 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<mailto: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
> 
> 
> 
> 
> 
> ~~ Maurizio Montis - Control System Engineer ~~
>    office: +39 0498068558
>    mobile: +39 3408428089
> mail: maurizio.montis@lnl.infn.it<mailto:maurizio.montis@lnl.infn.it>
>    skype: maurizio_montis
> 
> Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali di
> Legnaro
>    V.le dell'Universita', 2
>    35020 LEGNARO (PD) - ITALY
> 
> 
> 
> 
> 
> ________________________________
> 
> << Le informazioni contenute in questo messaggio di posta elettronica
> e relativi allegati sono riservate e confidenziali e ne è vietata la
> diffusione in qualunque modo eseguita. Qualora Lei non fosse la
> persona a cui il presente messaggio è destinato, La invitiamo ad
> eliminarlo e a darcene gentile comunicazione. Quanto precede ai fini
> del rispetto delle Legge 675/96 e del Decreto Legislativo 30/06/2003
> n.196, sulla tutela dei dati personali >>
> 
> << This e-mail is confidential and may well also be legally
> privileged. If you have received it in error, you are on notice of its
> status. Please notify us immediately by reply e-mail and then delete
> this message from your system. Please do not copy it or use it for any
> purposes, or disclose its contents to any other person: to do so could
> be a breach of confidence. Thank you for your co-operation. Please
> contact our IT Helpdesk on +3902380481 or email it@cgspace.it if you
> need assistance >>
> 



~~ 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
   V.le dell'Universita', 2
   35020 LEGNARO (PD) - ITALY