RE: Make waveform from ai record

[Žiga Oven via Tech-talk <tech-talk at aps.anl.gov>]

Hi Abdalla,

 

One way how to create waveform from scalars with EPICS records is Compress Record with an ALG field set to Circular Buffer and INP field pointing to your AI record.
https://epics.anl.gov/base/R7-0/8-docs/compressRecord.html

You still have to configure processing of the compress record (either FLNK from AI record, or CP flag on the INP link) to capture all the 200 samples.

 

Then you can point a waveform record to read the 200 sample with either 1 second SCAN rate or you can create some other (“complex”) logic to extract the data into waveform only when 200 “fresh” samples are in the compress record.

 

Hope this helps,

 

Žiga

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Abdalla Ahmad via Tech-talk
Sent: Thursday, February 20, 2025 07:56
To: tech-talk at aps.anl.gov
Subject: Make waveform from ai record

 

Hi

 

I have a fast ai record (200 Hz) in a stream-device-based IOC. Is there a "standard way" within EPICS records to transform these 200 samples into a single waveform record of size 200 processed at 1 second for example? Thanks.

 

Best Regards,

 

Abdalla.

Control Engineer

SESAME