Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  <20032004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  <20032004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019 
<== Date ==> <== Thread ==>

Subject: Re: aiRecord, RVAL vs. VAL
From: Amy Baum <amy_baum@lynceantech.com>
To: Amy Baum <amy_baum@lynceantech.com>
Cc: tech-talk@aps.anl.gov
Date: Thu, 04 Dec 2003 14:06:43 -0800

oops, I forgot to mention I'm using EPICS 3.14.2


Amy Baum wrote:

Hi all,


I've written a very simple record interface and am having
a strange problem.

The record is very simple :

record(ai,"TEMP1") {
        field(SCAN,"Passive")
        field(DTYP,"TEMP")
        field(INP,"@d=$(device) t=$(tty) b=$(baud) p=$(portconf) c=1 ")
        field(PINI,"1")
        field(LINR,"NO CONVERSION")
        field(PREC,"14")
        field(HOPR,"500")
        field(LOPR,"0")
}

The driver simply reads a temperature from a device on
a serial port and writes it to the VAL field of this record.

The problem I'm having is that both the medm & probe programs
that came with the extensions package are displaying the
value from the RVAL field, rather than the VAL field.

Is there some other field I need to set to get these other
programs to retrieve the value from the VAL field? Is this
a bug? I've looked through the Record Reference Manual
several times, and haven't seen any mention of fields
that might affect this behavior.

Since this data doesn't need any conversions applied to it,
I tried to work around this problem by setting RVAL to the
temperature, only to find that the RVAL field is merely an int
field, while my temperature value is a double, and I lose the
precision of my data.

Why is RVAL only an int type if it is intended to hold the
raw data from hardware?

Thanks for any help or suggestions.

Amy

BTW: I'm using Redhat 7.3, vanilla 2.4.20 kernel, gcc 2.96





Replies:
Re: aiRecord, RVAL vs. VAL Amy Baum
References:
aiRecord, RVAL vs. VAL Amy Baum

Navigate by Date:
Prev: aiRecord, RVAL vs. VAL Amy Baum
Next: Re: aiRecord, RVAL vs. VAL Amy Baum
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  <20032004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019 
Navigate by Thread:
Prev: aiRecord, RVAL vs. VAL Amy Baum
Next: Re: aiRecord, RVAL vs. VAL Amy Baum
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  <20032004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019 
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 ·