Experimental Physics and
Industrial Control System

Stefan Heim <[email protected]> · Fri, 13 Jul 2007 23:27:40 +0200

Tim,

On Freitag, 13. Juli 2007, you wrote:
> Stefan Heim wrote:
> > In the streamdevice protocol file I have (among others)
> >
> > getX {
> >         out "Joe Crds ?";
> >         in "Joe Crds %f %*f %*f %*f %*f %*f %*f ";
> > }
> >
> > setX {
> >         out "Joe AxisAbs 1 %(VAL)f";
> >         in "Joe started";
> > }
> > [...]
>
> I think you are *telling* the streamDevice to ignore ASLO and AOFF, by
> using the
> format "%(VAL)f".

That's indeed the case. It's a feature, not a bug ;-) If I use %f instead 
of %(VAL)f, I get the desired ASLO/AOFF scaling with streamdevice and an ao 
record.

> As I read the doc, it would do what you want if you 
> used the
> format "%f".  According to streamDevice/doc/ao.html, the streamDevice
> would, in this case, perform the calculation
>
>     |OUTPUT_VALUE = (OVAL-AOFF)/ASLO
>
> without converting to integer.  (I.e., the streamDevice would grab the
> required
> field values, and perform the calculation independently of the record.)

Can't believe this has slipped through my attention! Stupid mistake, thank you 
for getting me back on track.

On a academic basis I still wonder whether to give the responsibility to 
honour ASLO/AOFF to the device support is a good idea. Aren't ASLO/AOFF 
supposed to be a property of _any_ ao record, regardless what device support 
it might reside on?

Thanks again,
-Stefan

-- 
Stefan Heim, PhD Student X-ray microscopy
BESSY mbH, Albert-Einstein-StraÃe 15, D-12489 Berlin, Germany
voice: +49 30 6392 3177 fax: + 49 30 6392 4757 e-mail: [email protected]
BESSY mbH - Mitglied der Leibniz Gemeinschaft
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GeschÃftsfÃhrer: Prof. Dr. Dr. h.c. Wolfgang Eberhardt, Prof. Dr. Eberhard 
Jaeschke 
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System