Experimental Physics and
Industrial Control System

Carl Schumann <[email protected]> · Thu, 11 Jun 2009 10:42:04 -0500

Hi,

We are getting the following error printed to stdout/stderr from an EDM

X-Y Graph:

CA value callback('...'): No data, CA status The requested data transfer

is greater than available memory or EPICS_CA_MAX_ARRAY_BYTES

In the error case above we are attempting to go through a gateway. We

also have the same EDM screen accessible from a location where no

gateway is required. For the no gateway case we don't get the error.

That would tend to point to issues with the gateway, but the following

point seems to contradict that theory.

On the machine which requires the gateway for access to the PV and on

which we run EDM and see the error we are able to use caget at the

command line to get the data without issue. Any ideas about what is

not well here? Thanks for your time.

Sincerely,
Carl Schumann