Experimental Physics and
Industrial Control System

Carlos Pascual <[email protected]> · Wed, 16 Dec 2015 19:42:32 +0100

Hi! 

Thanks a lot for the suggestions and the comments.

I was unaware that there were already applications using URIs for 
channel access (I did only a shallow search before implementing the 
taurus-epics plugin). Are there any documents detailing the 
specifications for "ca" URIs?
Specifically it would be great to learn about standard conventions for 
the "authority", "path", "query" and "fragment" parts of the URI (just 
to avoid doing it in inconsistent ways like I did for the "scheme" part)

I'll definitely change  the scheme to "ca" (and "pva" if I go into epics 
v4). At this moment, the epics plugin in taurus is just a proof-of-
concept so there is no problem in doing such changes. In fact, my 
intention is to port what we had in Taurus v3 to taurus v4 and then 
leave it for someone interested in developing it further (we do not use 
epics at ALBA).

Also, thanks for the pointers to the docs.

Cheers

On Wed 16 December 2015 14:54:24 Kasemir, Kay wrote:
> On Dec 16, 2015, at 4:41 AM, Ralph Lange <[email protected]> wrote:
> > One more remark  about
> > 
> > > $ taurusform epics://XXX:random epics://XXX:a epics://XXX:b
> > > epics://XXX:sum> 
> > The EPICS V3 network protocol is called Channel Access. In URI-type
> > notation, applications should use "ca:" to denote the scheme. The
> > EPICS V4 (next generation) network protocol is called PV Access.
> > Its common URI scheme tag is "pva:". Unless the "epics:" tag stands
> > for something taurus-internal that is a different scheme and not
> > Channel Access, I would really prefer a consistent naming.
> Couldn’t agree more.
> 
> CS-Studio contributed to this confusion because it allows “epics://“
> as well as “ca://“. Using "epics://“ seemed logical to some of the
> involved parties at the time because end users talk to “EPICS”, but
> using the underlying protocol “ca://“ (or by now also “pva://“) is
> better in the long run, plus fewer characters to type.
> 
> Thanks,
> Kay

-- 
+----------------------------------------------------+
 Carlos Pascual Izarra
 Scientific Software Coordinator
 Computing Division
 ALBA Synchrotron  [http://www.albasynchrotron.es]
 Carrer de la Llum 2-26
 E-08290 Cerdanyola del Valles (Barcelona), Spain
 E-mail: [email protected]
 Phone: +34 93 592 4428
+----------------------------------------------------+

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System