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Subject:	Using waveform to read array in StreamDevice
From:	=?gb18030?b?yPTAvA==?= via Tech-talk <tech-talk at aps.anl.gov>
To:	"=?gb18030?b?dGVjaC10YWxr?=" <tech-talk at aps.anl.gov>
Date:	Wed, 19 Apr 2023 19:53:44 +0800

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

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ANJ, 20 Apr 2023