EPICS Re: [EXTERNAL] CSS jython setvalue behaviour

Experimental Physics and Industrial Control System

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Subject:

Re: [EXTERNAL] CSS jython setvalue behaviour

From:

Pilar Gil via Tech-talk <[email protected]>

To:

"Kasemir, Kay" <[email protected]>

Cc:

"[email protected]" <[email protected]>

Date:

Thu, 12 Sep 2019 16:18:58 +0200

I have check with local variables works if I set manually the type of data. The think is that I would like to set a PV that I have defined in a DB.

The type of data that I have is

Access: read, write
Native data type: DBF_DOUBLE
Request type: DBR_DOUBLE

If I used caput for setting the PV there is no problem. But it is impossible to set this variable through a script. I get following exception:

Traceback (most recent call last):
File "<script>", line 7, in <module>
at org.csstudio.vtype.pv.jca.JCA_PV.performWrite(JCA_PV.java:547)
at org.csstudio.vtype.pv.jca.JCA_PV.write(JCA_PV.java:412)
at org.csstudio.simplepv.vtypepv.VTypePV.setValue(VTypePV.java:256)
at sun.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
java.lang.Exception: java.lang.Exception: Cannot handle type java.math.BigInteger

Is there another possibility for doing that in CSS?

Thank you Kay!

Pilar

El jue., 12 sept. 2019 a las 15:49, Kasemir, Kay (<[email protected]>) escribió:

> 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

Pilar Gil Jaldo

Embedded SW Engineer

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