Re: Using waveform to read array in StreamDevice

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

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 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
>
>
>