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: [External] Re: Scaling mA to A: EPICS or Phoebus?
From: Andrew Johnson via Tech-talk <tech-talk at aps.anl.gov>
To: "Leblanc, Gregory" <leblanc at ohio.edu>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Cc: Eric Norum <ericnorum at gmail.com>
Date: Fri, 23 Jun 2023 16:43:35 -0500
On 6/23/23 4:29 PM, Leblanc, Gregory via Tech-talk wrote:
I think the EGUL and EGUF fields and LINEAR for the LINR field might do the same thing, but I haven’t quite parsed the aiRecord docs yet.
In LINR=Linear mode the ai's device support is responsible for calculating ESLO and EOFF from EGUL and EGUF, but to do that it needs to know what raw values map to the two ends of the engineering-units range. When EPICS was developed an ai record would normally have been connected to an ADC of a known width so that range would be documented with the hardware, but stream-device can't do that calculation unless there's a way of giving it the raw range in the proto file (I don't think there is). Using LINR=Slope avoids having to tell it, so in this case Slope is probably the better solution.

- Andrew
-- 
Complexity is free, it's Simplicity that takes work.
References:
Scaling mA to A: EPICS or Phoebus? Leblanc, Gregory via Tech-talk
RE: [External] Re: Scaling mA to A: EPICS or Phoebus? Leblanc, Gregory via Tech-talk
Navigate by Date:
Prev: RE: [External] Re: Scaling mA to A: EPICS or Phoebus? Leblanc, Gregory via Tech-talk
Next: Open position in Controls @ PSI - control system specialist Celcer Tine 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: [External] Re: Scaling mA to A: EPICS or Phoebus? Leblanc, Gregory via Tech-talk
Next: Real-Time Spectral Analysis of streaming data in EPICS operator screens. Evans, Richard K. (GRC-H000) 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, 24 Jun 2023 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·