Re: Using waveform to read array in StreamDevice

[Maren Purves via Tech-talk <tech-talk at aps.anl.gov>]

Thanks Dirk,

the device broke years ago, so this really isn't an issue anymore, but it worked the way I did it.

Maren

On Thu, Apr 20, 2023 at 12:29 AM Zimoch Dirk <dirk.zimoch at psi.ch> wrote:

On Wed, 2023-04-19 at 11:00 -1000, Maren Purves wrote:
> If you're writing code anyway (like for an asub record) you can strip those characters out just like any other - I once had to deal with a device that sent 3 lines of output that I wanted to fit into a (3.13, probably .5 or .8) stringin.
>

Aloha Maren,

No, I did not write code to solve that problem.

With only 3 lines, you may try to write 3 'in' commands in one protocol (and use
redirection).

More details about your 3 lines?

Dirk



> Aloha,
>
> Maren Purves
> East Asian Observatory / JCMT
>
> On Wed, Apr 19, 2023 at 5:56 AM Zimoch Dirk via Tech-talk <tech-talk at aps.anl.gov> wrote:
> > Hello Kevin,
> >
> > Unfortunately, StreamDevice does not yet support columns (or tables).
> > You may be able to read the whole array into a waveform then use a aSub Record
> > to filter out the columns, but that s a bit tricky because of , and CR LF.
> >
> > Maybe I can say more tomorrow...
> >
> > Dirk
> >
> >
> > On Wed, 2023-04-19 at 19:53 +0800, 若兰 via Tech-talk wrote:
> > > Hello everyone,
> > >     I have a Counter which can store data  to a buffer.
> > >     (1)  With command "GSDAL?", an array can be read out from the buffer, which looks like this:
> > >       
> > >        fig.1
> > >     
> > >               
> > >     The first 8 colums are Counter data and the last coloum is Timer data.  Every line end with CR+RF.
> > >     (2) With another command “GSCRD?00000000100”, the buffer can get the following array. Every line end with CR+RF.
> > >       
> > >     fig.2
> > >     
> > >
> > > Question 1. How to read the  2-d array (fig 1) into EPICS? Can I use a waveform to do it? Does anybody has an example for it?
> > >   
> > > Question2. I used a waveform to read the second array (in fig.2).
> > >     record(waveform, "$(D):Array0")
> > >    {
> > >       field(DTYP, "stream")
> > >       field(INP, "@xxx.proto  array_in  $(PORT)")
> > >       field(NELM, "100")
> > >       field(FTVL, "SHORT")
> > >       field(SCAN, "5 second")
> > >    }
> > >
> > > in the xxx.proto:
> > >   array_in {
> > >   seperator=CR;  #or CR LF,  no different result
> > >   out  "GSCRD?00000000100";
> > >   in "%5d";
> > > }
> > >     
> > > and the result shows:
> > >  xxx:Array0 200  0  0  0   0  0  ....   0
> > > Surely the data is not read correctly.
> > >
> > > I wonder what the problem is. 
> > > Can I use waveform to read it?
> > > Is there any problem with waveform? For example, the seperator?
> > > If not use waveform, how can I read the array out from device buffer?
> > >
> > > Thanks very much for any advice.
> > >
> > > Best reguards
> > >
> > > Kevin
> > > 279762081 at qq.com
> > >
> > >
> > >