Re: [Tauruslib-users] Question about taurus model for commands.

[Zbigniew R. <zre...@ce...>]

Hello Giacomo,

Thanks for your email! I reply also to the 
tau...@li...
which is a dedicated list to the taurus user queries.

In taurus you can executed commands on taurus devices (representing 
Tango devices) in the following way:

In [1]: import taurus
In [2]: d = taurus.Device('sys/tg_test/1')
In [4]: d.DevFloat(1)
Out[4]: 1.0

However the model concept of Taurus does not include commands.
Please take a look on the current documentation
http://www.taurus-scada.org/en/latest/devel/core_tutorial.html#model-concept
And also keep an eye on TEP3 and TEP14 which are refactoring the taurus 
core:
https://sourceforge.net/p/tauruslib/wiki/TEP3
https://sourceforge.net/p/tauruslib/wiki/TEP14

That means that you can not set a Tango command as a model of e.g. 
TaurusPlot and expect from it
that it periodically execute the command and replot your curve.
Of course you can develop your widget using taurus library to do what 
you want.
An example of widget related to Tango commands is a TaurusCommandButton:
http://www.taurus-scada.org/en/latest/devel/api/taurus/qt/qtgui/button/_TaurusCommandButton.html
In this case its model is a Tango device.

I recall that in the TEP3 and TEP14 discussions, commands were evaluated 
as models for Taurus, but I can't remember details.
It seems that this was completely discarded cause the documents do not 
mention them.
For sure Carlos Pascual will inform you better about it whenever he is 
back from holidays.

I hope it helps,
Zibi


On 07/28/2015 05:17 PM, Giacomo S. wrote:
> Hello Tangoers, hello Tiago.
>
> Is it possible in Taurus to "read" commands with a syntax like the
> following:
>
> inj/diagnostics/cm_inj.01->GetCharge(0,1000)
>
> where I want to plot the output of the command GetCharge, which requires
> two parameters, a "mode" (0) and the number of
> returned points (1000).
>
> This would produce a 1000 points curve.
>
> Thanks Giacomo.

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	Zbigniew Reszela
Controls Section - Computing Division

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