Re: Altering timestamp of softIOC PV

["Reimer, Paul E. via Tech-talk" <tech-talk at aps.anl.gov>]

The "acquisition time" is a trigger generated elsewhere and served by equipment that, at this time, can't talk directly to EPICS.  The best solution is to have the acquisition system talk directly with EPICS--I argued for this--but that is not what I have. The data is essentially buffered (with and acquisition timestamp) and then handed off to a system that talks with EPICS.

Paul

On 1/25/21 16:34, Arnold, Ned D. wrote:

> I would like the timestamp field for that PV to reflect the acquisition time rather
than the time that the ca_put(DBR_LONG, stchid, &iParVal) routine is
called.

Is the "acquisition time" a user defined time, an event within the IOC, or an external trigger generated from somewhere else? 

  Ned

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Reimer, Paul E. via Tech-talk <tech-talk at aps.anl.gov>
Sent: Monday, January 25, 2021 02:14 PM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Altering timestamp of softIOC PV

 

Hello,

Is it possible to alter the timestamp field of a PV? Specifically, I
have a situation in which data is recorded by a computer, but might not
be put into EPICS immediately (few sec delay is possible). I would like
the timestamp field for that PV to reflect the acquisition time rather
than the time that the ca_put(DBR_LONG, stchid, &iParVal) routine is
called.  I note that the time field is of type "NOACCESS" in the manual.

Thanks,

Paul

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-- 
If you receive this e-mail after hours, during a weekend, or on a holiday,
please enjoy your time off and respond during your working hours.

Paul E Reimer               +1-630-252-4037 (Office)
Bldg 203, Physics Division  +1-630-252-3903 (fax)
Argonne National Laboratory +1-630-344-9207 (mobile)
9700 S Cass Ave             reimer at anl.gov
Lemont, IL  60439 USA.      he/his/him