Experimental Physics and
Industrial Control System

Zenon Szalata <[email protected]> · Sat, 9 Mar 2013 09:07:26 -0800

Hi Mark,

I have a peculiar problem with an IOC using an area detector. It

controls a prosilica camera (not sure what is the model, it has 1292x964

image size, monochrome). Area detector version is 1.8, asyn 4.20, and

EPICS 3.14.12.2,

It all works fine.

A problem is encounred when a few hops are needed to get to the computer

where the soft IOC runs.

This is how we are doing it:

there are three subnets, call them SA, SB, and SC. Three computers are

involved:

the operator is sitting in front of computer CC on subnet SC. The

operator does ssh from CC to computer CB on subnet SB, and from there

does ssh to computer CA on subnet SA. The IOC runs on CA. This is

needed because the accelarator operators can only get to subnet SA as

described above via two hops. The prosilica EDM control screens work

fine and there is no problem until we launch ImageJ. It connects and

the IOC starts printing the following messages:

2013/03/08 12:20:21.833 PS1:cam1:PSReadStatistics devAsynInt32 process

error

2013/03/08 12:20:26.833 prosilica:readStats: error, status=14
2013/03/08 12:20:26.833 prosilica:readParameters: error, status=8

2013/03/08 12:20:26.833 prosilica:writeInt32: error, status=8

function=76, value=0

Stopping ImageJ does not clear the problem. It seems that the only way

to get out of this is to restart the IOC.

Strangely, the EDM viewer widget does somewhat better. We can use one

of those, but the same problem accurrs when a second EDM viewer is started.

It seems to be a bandwidth problem. But why does the IOC get into the

mode where it cant process periodic chores and won't recover?

Any ideas or suggestions would be very helpful.
Thanks,
Zen

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System