EPICS Home EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

Format page
for printing


Search Tech-talk
1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  <2020>  2021  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  <2020>  2021  2022  2023  2024 
<== Date ==> <== Thread ==>
Subject: Re: Stream device - general concept how to use
From: Ralph Lange via Tech-talk <tech-talk at aps.anl.gov>
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Date: Thu, 16 Jul 2020 16:09:20 +0200
On Thu, 16 Jul 2020 at 15:12, Arnold, Ned D. via Tech-talk <tech-talk at aps.anl.gov> wrote:
I think you could do both of Mark's suggestion at the same time yielding periodically scanned status records that also get scanned immediately when an associated "set" record is written to. 

Yep.

Manual on-demand scanning could be implemented with an OPI button that writes to the record's PROC field.
Sometimes I have seen different scan rates being applied based (using a seq record) on device status: poll fast when things are "moving", poll slow when things are not.

BTW. This issue is not particular to StreamDevice at all.
Any readback from a device that has to be actively polled will act the same way.

Cheers,
~Ralph

References:
Stream device - general concept how to use Christian Pauly via Tech-talk
Re: Stream device - general concept how to use Mark Rivers via Tech-talk
Re: Stream device - general concept how to use Arnold, Ned D. via Tech-talk
Navigate by Date:
Prev: PowerMaster II device support? DiMonte, Nicholas via Tech-talk
Next: RE: Modbus alarms question Mark Rivers via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  <2020>  2021  2022  2023  2024 
Navigate by Thread:
Prev: Re: Stream device - general concept how to use Arnold, Ned D. via Tech-talk
Next: Re: Stream device - general concept how to use Christian Pauly via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  <2020>  2021  2022  2023  2024 
ANJ, 16 Jul 2020 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·