Experimental Physics and
Industrial Control System

Rod Nussbaumer <[email protected]> · Fri, 21 Dec 2012 07:03:56 -0800

Hi John.

I have some applications that use StreamDevice to acquire waveforms, and

those waveform records are normally on a periodic scan. I have a couple

of records which provide the display manager (EDM, here) with a choice

button for the scan rate, one choice of which is 'Pause'. This sets the

waveform record to scan 'passive', thus stopping the acquisition. You

can attach a choice button directly to the .SCAN field of the record

that triggers an acquisition, but there will be some values that

operators probably don't want to see or select. This may differ from

what you really want, as the entire acquisition stops in this scenario,

not just the display. You might be able to use a system of records that

duplicates the waveform; one for continuous processing, and another for

visualization only.

Rod Nussbaumer
ISAC Controls, TRIUMF
Vancouver, Canada.

On 12/20/2012 02:28 PM, John Dobbins wrote:

Hello All,

I am using a CSS XY graph to display a waveform. The graph actually
displays the last n values on the waveform presenting an oscilloscope
like trace. I would like to be able to pause the display. Can someone
recommend a way of doing this?

Regards,

John Dobbins

Lab for Elementary Particle Physics
Cornell University

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System