Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  <20012002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  Index 1994  1995  1996  1997  1998  1999  2000  <20012002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020 
<== Date ==> <== Thread ==>

Subject: RE: Callbacks and the PCAS question.
From: Mark Rivers <rivers@cars.uchicago.edu>
To: "'Brian Tieman'" <tieman@aps.anl.gov>
Cc: "'tech-talk@aps.anl.gov'" <tech-talk@aps.anl.gov>
Date: Fri, 16 Feb 2001 17:32:17 -0600
Brian,

The way we do this is to make the data acquisition program be a channel
access client, rather than a channel access server.  The scan software
writes a 1 to a local "Busy" record, which is just like a binary output
record except it does not do the forward link until its value goes back to
zero.

The acquisition program monitors that Busy record. When it goes to 1 it
starts collecting data.  When the data acquisition is done it sets the Busy
record back to zero, which lets the scan continue.  This method does not
have a problem with a 30 second limit.

Mark


Replies:
Re: Callbacks and the PCAS question. Brian Tieman

Navigate by Date:
Prev: Re: dm won't load gif Ian Smith
Next: MATLAB and EPICS Channel Access Ernest L. Williams Jr.
Index: 1994  1995  1996  1997  1998  1999  2000  <20012002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020 
Navigate by Thread:
Prev: Callbacks and the PCAS question. Brian Tieman
Next: Re: Callbacks and the PCAS question. Brian Tieman
Index: 1994  1995  1996  1997  1998  1999  2000  <20012002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020 
ANJ, 10 Aug 2010 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·