Experimental Physics and
Industrial Control System

Ralph Lange <[email protected]> · Tue, 24 Feb 2009 17:07:09 +0100

Not quite as simple as it sounds.

The pvlistserver depends on the EPICS database on an IOC being static

and well-defined.

A CAS can practically sit on top of anything: e.g. a single server

(IOC), a known set of servers (Gateway to my known network), an unknown

set of servers (Gateway to the outside world), a service that creates

PVs on the fly.

What should such a "get the list of PVs" function return, in cases when
o the number of PVs is very large (Gateway to the outside world)

o the PVs are unknown, because they are only connected to on demand

(any Gateway)

o the PVs can never be known, because they are dynamically created by

asking for them (on-demand PV server)

Compare this to asking your gateway router which IPs it would provide

access to...

I agree with Bob that this issue is probably to be handled outside the

Channel Access domain. And still for some servers there is no finite list.

Ralph

On 24.02.2009 00:26 Bruno Coudoin wrote:

Le lundi 23 février 2009 à 14:19 -0800, Ernest L. Williams Jr. a écrit :

Bruno Coudoin wrote:

>From a Channel Access client, is there a way to dynamically get the list
of PVs exported by an IOC or a CAS?

Hi Bruno,

John Sinclair from SNS created a nice tool for this.
http://ics-web.sns.ornl.gov/pvlistserver/log/show.php?mon=Jan&theDay=5&year=2004

I hope to have it working under RTEMS as well:

Hum, I see. Did anybody started an implementation for a CAS ?

Bruno.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System