Re: archive engine scanned vs sampling

["Kasemir, Kay via Tech-talk" <tech-talk@aps.anl.gov>]

I think there’s a copy/paste error in that example, listing the same channel name twice.

As for scan vs. monitor:

Both internally “monitor” the channel and receive an update whenever the IOC sends an update, which for analogs depends on the SCAN and ADEL of the record.

<period>00:10:00</period><scan/> will write the most recently received value every 10 seconds.

<monitor/> will write every received, well, monitor, but because of internal buffering you should provide an estimated change period. So <period>1.0</period><monitor/> means: Please write every received value, and assume that you won’t get them more frequently than once every second.

Longer explanation can be found in in the older manual.pdf on https://controlssoftware.sns.ornl.gov/chanarch/, section 2.3 Sampling Options.

 

 

 

From: Tech-talk <tech-talk-bounces@aps.anl.gov> on behalf of Geoffrey Savage via Tech-talk <tech-talk@aps.anl.gov>
Date: Wednesday, March 27, 2024 at 1:04 PM
To: tech-talk@aps.anl.gov <tech-talk@aps.anl.gov>
Subject: [EXTERNAL] archive engine scanned vs sampling

Hi,

I'm not understanding these two example entries from the archive engine doc.  Do they have the same behavior as explained in the Scanned/Sampled section of the doc?

https://urldefense.us/v3/__https://cs-studio.sourceforge.net/docbook/ch11.html__;!!G_uCfscf7eWS!Yrp6X1ys7AL3BEGrVLlF3UVvjpzI-Y6aKuuW1hOU6b8wNzAODrNZwo_lb2nPKG4GzxZeUsQRkfc02S8chTfl3w$

      <!-- Channel that is scanned every 10 minutes-->
      <channel>
         <name>NSV:Enable</name>
         <period>00:10:00</period><scan/>
         <enable/>
      </channel>

      <!-- Channel that enables sampling of this group -->
      <channel>
         <name>NSV:Enable</name>
         <period>1.0</period><monitor/>
         <enable/>
      </channel>

Geoff