Re: Truncated LSO

["Johnson, Andrew N. via Tech-talk" <tech-talk at aps.anl.gov>]

Actually you don’t _have_ to use pvxs, it depends on the client you’ll be using whether the older pvAccess implementation will work. The long string field modifier turns the lsi.VAL field into an array of char’s, and some clients (CSS Phoebus being one I believe, like the caget -S option) can be told to display the result as a string.

- Andrew

__ 

Complexity is free, you pay for Simplicity

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Jure Varlec via Tech-talk <tech-talk at aps.anl.gov>
Sent: Wednesday, July 31, 2024 1:07 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: Truncated LSO

 

Hi,

You need to build your IOC with a recent version of PVXS. This will serve records over PVAccess using the newer QSRV2, which handles the lsi record the way one would expect. For a quick test, use softIocPVX that comes with the PVXS module.

Best,
Jure

On 7/31/24 03:09, Di Wang via Tech-talk wrote:
> Caution: This email originated from outside of Cosylab.
>
>
> Hi Dave,
>
> You can try "Long String Field Modifier $" for your purpose.
> Doc: https://urldefense.us/v3/__https://epics.anl.gov/base/R7-0/8-docs/doxygen/filters.html__;!!G_uCfscf7eWS!cnuappWtgqPWAx1TPmDXqDhMvigKvWKoFp2iYWd5Q8WjhwPeqNIiUSy188XGNI75gNbTE1TS62BgbrFUQfin8Q$
>
> $ caput -S plain.VAL$ "this is a string longer than forty characters"
> Old : plain.VAL$
> New : plain.VAL$ this is a string longer than forty characters
>
> $ caget -S plain.VAL$
> plain.VAL$ this is a string longer than forty characters
>
> I am also curious about how to do it through PV Access though...
>
> Cheers,
> Di
>
>> Date: Tue, 30 Jul 2024 17:53:23 +0000
>> From: Dave Bracey <dbracey at fnal.gov>
>> To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
>> Subject: Truncated LSO
>>
>> I'm using an lso record and my string gets truncated to 40 chars:
>>
>> record(lso, "plain_lso")
>> {
>>   field(SIZV, 256)
>> }
>> $ pvput plain_lso "This is a string longer than forty characters"
>> Old : <undefined>               INVALID DRIVER UDF
>> New : 2024-07-30 12:45:33.238  "This is a string longer than forty char"
>> $ pvget plain_lso
>> plain_lso 2024-07-30 12:45:33.238  "This is a string longer than forty char"
>>
>> What am I doing wrong here?
>