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

Subject: Re: [EXTERNAL] CSS jython setvalue behaviour
From: "Kasemir, Kay via Tech-talk" <tech-talk@aps.anl.gov>
To: Pilar <pilar.gil@sevensols.com>
Cc: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Thu, 12 Sep 2019 13:49:40 +0000
>  And if I want to use a PV defined in the database? What can I use?

When you connect to a Channel Access PV, you get the type that Channel Access reports.
You cannot change it.
For an analog input record, you get VDouble.
When you connect to the RVAL field, you get VInt.

The exact details of local PV handling differ depending on using
 * vtype.PV with Eclipse-based BOY
 * PVManager with Eclipse-based BOY
 * The latest CS-Studio, i.e. the Display Builder under Phoebus

In the latter, when I use  "loc://num(0)" it defaults to a VDouble.
A script can write 2147483649 (= 0x80000001) to that variable without loss.
I can also use loc://num<VLong>(0) to force a double type, again written without loss.
loc://num<VInt>(0) wasn't supported, just added that, and it truncates when you write something larger than 0x7fffffff (shows up as negative).

-Kay

Replies:
Re: [EXTERNAL] CSS jython setvalue behaviour Pilar Gil via Tech-talk
References:
CSS jython setvalue behaviour Pilar via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Kasemir, Kay via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Pilar Gil via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Kasemir, Kay via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Pilar Gil via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Kasemir, Kay via Tech-talk
Re: [EXTERNAL] CSS jython setvalue behaviour Pilar via Tech-talk

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