Experimental Physics and
Industrial Control System

"Chen, Xihui" <[email protected]> · Thu, 26 Jul 2012 13:06:19 -0400

Hi John,

In BOY XY Graph widget, you just need to set trace property "Buffer Size" to m*N and "Concatenate Data" to yes. Please let me know if it works for you.

Best regards,
Xihui

> -----Original Message-----
> From: John Dobbins [mailto:[email protected]]
> Sent: Thursday, July 26, 2012 12:14 PM
> To: EPICS Tech-Talk
> Subject: waveform display
> 
> All,
> 
> I have a waveform record which holds the latest N samples of a
> transient. It is periodically updated. I would like to display the last
> m readings of this waveform as a single plot, i.e. m*N points, to
> recreate a longer time record. With each update the display would
> discard the oldest N values and add the newest N values.
> 
> I stumbled around in EDM and CSS/BOY and failed to get the behavior I
> wanted but may well have missed something. I could accomplish this in
> the IOC (creating a long waveform and displaying that) but then I would
> be retransmitting data unnecessarily, so I was wondering if this is
> easily done in a display tool.
> 
> In CSS I could write a javascript which creates a local PV that
> implements this behavior?
> 
> Other suggestions?
> 
> Thanks and regards,
> 
> John Dobbins
> Cornell Laboratory for Accelerator-based Sciences and Education Cornell
> University Ithaca, NY
> 
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System