Experimental Physics and
Industrial Control System

Matt Newville <[email protected]> · Wed, 26 Jan 2011 23:08:03 -0600

Hi Craig,

Sorry for the trouble.

I've never tried a waveform of strings -- I didn't know it was
possible, actually.  I can see that a) it is possible, and b) that the
current pyepics code makes the assumption that a DBR_STRING PV cannot
take more than 40 characters total, regardless of element_count.
That's probably why you're seeing only the first element of the
waveform.

I see a possible fix, and will try to test it tomorrow.

Cheers,

--Matt Newville <newville at cars.uchicago.edu> 630-252-0431

On Wed, Jan 26, 2011 at 9:50 PM,  <[email protected]> wrote:
> Hi,
>
> Does anyone know if Py-Epics should be able to correctly read/write string waveform records?  I only seem to be able to access  the first element.
>
> using caget (C utility) from base is OK, it returns all elements
>
>>caget  stringWaveform
> has09eenv:weather:area1:test 5 testing one two three four
>
> but using Py-Epics I only see the first although the count is correct
>
> In [12]: pv=epics.PV('stringWaveform')
>
> In [13]: pv.get()
> Out[13]: 'testing'
>
> In [14]: pv.count
> Out[14]: 5
>
> float waveform records are fine though.
>
> Thanks
> -------------------------------------------------------
> Craig Haskins
> Software Engineer
> Australia Telescope National Facility
> CSIRO Astronomy and Space Science
> P.O.Box 76, Epping NSW 1710, Australia
> Phone: +61 2 9372 4309
> email: [email protected]
>
>
>
>
>
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System