Experimental Physics and Industrial Control System
|
lailongwei wrote:
hi,
when I use caget A, though the data has been gotten, it holds for
about ten sends untill the command exit.
This cause problem when I need to caget four PVs, whose sampling at the
same time is very important. How can I solve it.
Thanks!
2011-05-31
------------------------------------------------------------------------
lailongwei
One could argue that strictly speaking sampling over the network is
"wrong". TCP and thus CA does not support any real-time behavior. So the
best way to solve it is to sample all four PVs on the same real-time
IOC. This probably does not help when the PVs are not physically
connected to the same IOC. For the future SwissFEL project, we (meaning
Babak) took great effort to implement this kind of synchronous data
acquisition across multiple IOCs. Our implementation strongly depends on
our timing system to synchronize PVs on multiple IOCs. This is nothing
you can quickly do with a 'caget a; cage b; caget c; caget d;'
Dirk
- Replies:
- RE: caget command holds for more than 10 seconds Mark Rivers
- References:
- caget command holds for more than 10 seconds lailongwei
- Navigate by Date:
- Prev:
RE: caget command holds for more than 10 seconds Mark Rivers
- Next:
RE: caget command holds for more than 10 seconds Mark Rivers
- 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: caget command holds for more than 10 seconds Ralph Lange
- Next:
RE: caget command holds for more than 10 seconds Mark Rivers
- 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, 18 Nov 2013 |
·
Home
·
News
·
About
·
Base
·
Modules
·
Extensions
·
Distributions
·
Download
·
·
Search
·
EPICS V4
·
IRMIS
·
Talk
·
Bugs
·
Documents
·
Links
·
Licensing
·
|