Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 17 Jun 2011 12:13:22 -0500

Hi Pete,

On 2011-06-17 [email protected] wrote:
> In epics 3.14.11 it is possible to caput a long string (> 40 characters)
>  using the following:
> 
> caput -S mypv$ "some string that is longer than 40 characters"

Not quite; $ is a legal character in a record name, so to make this a long 
strings the $ *must* follow the . in the PV name, i.e. you have to use mypv.$ 
or mypv.VAL$.  The $ field modifier only works for fields of type DBF_*LINK or 
for DBF_STRING fields which have size(>40) in the record type's DBD file.

> Is there an equivalent for writing long strings from an edm (version
> 1-12-28) text control or similar widget?

Yes, when writing EDM John Sinclair copied MEDM's support for string I/O to a 
PV whose native type is an array of chars (which is what the above field 
modifier does).  Just point the regular EDM text widgets at a suitable PV.

> (In my particular case I want to write a long PV name into a DOL field)

You should be able to use this approach, mypv.DOL$

- Andrew
-- 
Optimization is the process of taking something that works and
replacing it with something that almost works, but costs less.
-- Roger Needham

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System