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<== Date ==> <== Thread ==>
Subject: Re: Periodic SCAN issue in EPICS Archiver Appliance
From: "Shankar, Murali via Tech-talk" <tech-talk at aps.anl.gov>
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Fri, 10 Mar 2023 14:23:24 +0000
>> Is it possible to archive value every 1s(periodically) for "I/O Intr" PV?
The EAA relies on camonitors being generated by the IOC. As long as the "I/O Intr" rate is greater than 1Hz, you should be able to get SCAN data at 1Hz. You can use "camonitor -m al <PVName>" to see what events (really their timestamps) are generated by the IOC.

For a PV changing at less than 1Hz, if you want to pre-process during retrieval, you could use one of the lastFill/firstFill/meanFill etc operators. For example, the PV with just one sample from Mar/01/2023 10:24:55

$ curl -s "http://machine/retrieval/data/getData.txt?pv=PV:THAT:CHANGES:INFREQUENTLY"
...
Mar/01/2023 10:24:55 -08:00   4.3007170248885E-4      0     0     456781452

can be proprocessed to generate data at 1Hz by using one of the fill operators.

$ curl -s "http://machine/retrieval/data/getData.txt?pv=lastFill(PV:THAT:CHANGES:INFREQUENTLY)"
...
Mar/10/2023 03:07:30 -08:00   4.3007170248885E-4      0     0     0
Mar/10/2023 03:22:30 -08:00   4.3007170248885E-4      0     0     0
Mar/10/2023 03:37:30 -08:00   4.3007170248885E-4      0     0     0
Mar/10/2023 03:52:30 -08:00   4.3007170248885E-4      0     0     0
Mar/10/2023 04:07:30 -08:00   4.3007170248885E-4      0     0     0
...

Hope that helps.

Regards,
Murali

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