Experimental Physics and
Industrial Control System

Matt Bickley <[email protected]> · Thu, 07 May 2015 10:02:12 -0400

On 05/07/2015 01:25 AM, Franklin Fuller wrote:

Hello,

My problem is: I have two soft IOCs running on a Mac (Yosemite) and I
can't seem to get CSS to connect to both simultaneously.  CSS connects
to each individually without issue.  In the terminal, I can use
caget/caput to drive both devices simultaneously.

I see this problem has shown up in this email list before, but the
suggestion seems to be to fix the CA.  As I'm able to get caget/caput to
work, though, I'm not sure it's a problem with CA.  Frankly, it's not
yet clear to me where exactly one should modify the myriad of
environment variables discussed.  The best I've found so far is two
variables defined in base/startup/Site.profile.  Currently I have:

  EPICS_CA_AUTO_ADDR_LIST=YES
  EPICS_CA_ADDR_LIST="xx.xx.19.255 127.0.0.1"

Where in the second I put both the "broadcast" IP and the local IP.
I've tried various settings here.  No solution yet.  I have also put
these into my ~/.bash_profile for good measure.

I also see the opposite of what others report: the first ioc started is
the one that CSS connects to, not the last.

~Franklin

Ralph Lange solved this problem and wrote a very nice summary of
his solution here:

https://wiki-ext.aps.anl.gov/epics/index.php/How_to_Make_Channel_Access_Reach_Multiple_Soft_IOCs_on_a_Linux_Host

We had the same issue, implemented Ralph's suggested changes, and it
resolved our situation very nicely.  Our system administration staff
thought this might cause the relevant computers to actually rebroadcast
over the network, but there is no additional network traffic...

all extra communication stays local to the computer running multiple

soft IOCs.

--
Matthew Bickley                                 Email: [email protected]
Deputy Head of Accelerator Operations           Telephone: 757-269-7347
TJNAF

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System