Experimental Physics and
Industrial Control System

Mark Rivers <[email protected]> · Tue, 27 Oct 2015 14:40:56 +0000

What you are seeing is a limitation of the default behavior of Channel Access with record fields of type DBF_STRING.  It is not a problem with the acalcout record.

However, EPICS base 3.14.11 added support for long strings over channel access, and the caput/caget/camonitor can now use it.  You need to add the -S option to the commands, and you need to append $ to the field name.

This is an attempt to write a 50 character string to the  .CALC field of an acalcout record using the default settings of caput

corvette:calc/calcApp/src>caput 13LAB:userArrayCalc1.CALC 01234567890123456789012345678901234567890123456789
Old : 13LAB:userArrayCalc1.CALC      0
New : 13LAB:userArrayCalc1.CALC      012345678901234567890123456789012345678

Note that it only wrote 39 characters.

This is a caput using the -S and $ settings:

corvette:calc/calcApp/src>caput -S 13LAB:userArrayCalc1.CALC$ 01234567890123456789012345678901234567890123456789
Old : 13LAB:userArrayCalc1.CALC$ 012345678901234567890123456789012345678
New : 13LAB:userArrayCalc1.CALC$ 01234567890123456789012345678901234567890123456789

Note that it wrote all 50 characters.

Now use caget with the default settings:

corvette:calc/calcApp/src>caget 13LAB:userArrayCalc1.CALC
13LAB:userArrayCalc1.CALC      012345678901234567890123456789012345678

Note that it only read back 39 characters.

Now use caget with the -S and $ settings:

corvette:calc/calcApp/src>caget -S 13LAB:userArrayCalc1.CALC$
13LAB:userArrayCalc1.CALC$ 01234567890123456789012345678901234567890123456789

Note that it read back all 50 characters.

Mark

-----Original Message-----
From: Gofron, Kazimierz [mailto:[email protected]] 
Sent: Tuesday, October 27, 2015 9:04 AM
To: [email protected]
Cc: Mark Rivers
Subject: Subject: RE: To read single element from waveform record

Mark,
The synApps that I am using is from 2013, and indeed the aCalcoutRecord.h has calc[80] set. 
When database is created, the CALC has to be hardcoaded in the database, and seems to work for string longer than 36 char. 
I tried to be set the aCalcoutRecord CALC value with caput and read it with caget. The field is truncated at about 38 chars when using caget/caput.
Kaz

Message: 4
Date: Mon, 26 Oct 2015 15:59:01 +0000
From: "Gofron, Kazimierz" <[email protected]>
To: "[email protected]" <[email protected]>
Subject: RE: To read single element from waveform record
Message-ID:
	<[email protected]>
Content-Type: text/plain; charset="us-ascii"

Tim,
Regarding your post on extraction of single element from waveform:
http://www.aps.anl.gov/epics/tech-talk/2015/msg01340.php

The actual value of the CALC field is truncated from CALC, "a:=aa[0,0];b:=aa[1,1];c:=aa[2,2];d:=aa[3,3]
To
CALC, "a:=aa[0,0];b:=aa[1,1];c:=aa[2,2];d:=aa[

Any news on changing the length of the CALC field length to 80, as suggested in posts from 5 years ago?
http://www.aps.anl.gov/epics/tech-talk/2010/msg01574.php

Kazimierz Gofron
NSLS-II Controls Group
Brookhaven National Laboratory
(p) +1 (631) 344 5283
(f) +1 (631) 344 8085
(e) [email protected]<mailto:[email protected]>
(w) www.bnl.gov/nsls2<http://www.bnl.gov/nsls2>

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Message: 5
Date: Mon, 26 Oct 2015 16:07:58 +0000
From: Mark Rivers <[email protected]>
To: "'Gofron, Kazimierz'" <[email protected]>, "[email protected]"
	<[email protected]>
Subject: RE: To read single element from waveform record
Message-ID:
	<70AE7462E7AD054C89DCBA45343D499A659E4EAC@CARSMAIL2.CARS.APS.ANL.GOV>
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This SVN commit suggests that CALC field length is indeed 80 characters since Sept. 2012:

r15207 | mooney | 2012-09-13 14:12:06 -0500 (Thu, 13 Sep 2012) | 7 lines

CALC fields are now 80-characters long

And the .h file reflects this:

grep calc ../../include/aCalcoutRecord.h ...
typedef struct acalcoutRecord {
        char            calc[80];       /* Calculation */
} acalcoutRecord;

What version of the calc module are you using?

Mark

From: [email protected] [mailto:[email protected]] On Behalf Of Gofron, Kazimierz
Sent: Monday, October 26, 2015 10:59 AM
To: [email protected]
Subject: RE: To read single element from waveform record

Tim,
Regarding your post on extraction of single element from waveform:
http://www.aps.anl.gov/epics/tech-talk/2015/msg01340.php

The actual value of the CALC field is truncated from CALC, "a:=aa[0,0];b:=aa[1,1];c:=aa[2,2];d:=aa[3,3]
To
CALC, "a:=aa[0,0];b:=aa[1,1];c:=aa[2,2];d:=aa[

Any news on changing the length of the CALC field length to 80, as suggested in posts from 5 years ago?
http://www.aps.anl.gov/epics/tech-talk/2010/msg01574.php

Kazimierz Gofron
NSLS-II Controls Group
Brookhaven National Laboratory
(p) +1 (631) 344 5283
(f) +1 (631) 344 8085
(e) [email protected]<mailto:[email protected]>
(w) www.bnl.gov/nsls2<http://www.bnl.gov/nsls2>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System