Experimental Physics and
Industrial Control System

Jameson Graef Rollins <[email protected]> · Wed, 21 Aug 2013 10:42:15 -0700

On Wed, Aug 21 2013, "J. Lewis Muir" <[email protected]> wrote:
> On 8/21/13 11:13 AM, Jameson Graef Rollins wrote:
>> Hi, folks.  Is there a way to query a channel access server (IOC,
>> portable CAS, etc.) for a list of all records it is serving?  I feel
>> like there should be a way, but I haven't been able to find any way to
>> do this yet.
>
> Hi, Jamie.
>
> Have you searched the mailing list archive?  I think the following
> thread would help you:
>
>   http://www.aps.anl.gov/epics/tech-talk/2012/msg02486.php

Hi, Lewis.  Thanks for the link.  I did a quick scan back through the
list, but it was clearly not sufficient!  This thread wasn't even from
that long ago :(

But it is indeed the same thing I was looking for.  And unfortunately it
sounds like there's good way to query a channel server for a list of its
records.

I must say I'm quite surprised to find out there's no method for doing
this.  It seems like a pretty obviously useful feature.

> Also note the difference between records and PVs.  Your subject field
> refers to channels (i.e. PVs), but your message body is asking for a
> list of records.  The two are different.  For each record, there are
> many possible PV names corresponding to the fields of the record.

Yes, sorry, that was maybe a little sloppy.  But I would settle for
either, actually, since there's obviously a lot of overlap.  The set of
records is just a subset of the set of PVs, and the additional fields in
the full set of PVs is predictable from the set of records.

jamie.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System