Experimental Physics and
Industrial Control System

"Szalata, Zenon M." <[email protected]> · Fri, 15 Apr 2011 13:38:26 -0700

Hi Andrew,
Thank you for your input.
With TPRO set to 1, I get:

epics> CAS-client: Process TEST:AO:TEST
CAS-client: Process TEST:AI:TEST

when the button is clicked, and

epics> CAS-client: Process TEST:AO:TEST
CAS-client: Process TEST:AI:TEST

when the IOC is restarted.

Only one button is available, which is EPICS "aware".

Thanks again,
Zen

> -----Original Message-----
> From: Andrew Johnson [mailto:[email protected]]
> Sent: Friday, April 15, 2011 1:27 PM
> To: [email protected]
> Cc: Szalata, Zenon M.; Andrew Rhyder
> Subject: Re: epicsQt
> 
> Hi Zen,
> 
> On Friday 15 April 2011 15:03:43 Szalata, Zenon M. wrote:
> >
> > I start camonitor TEST:AI:TEST, then the IOC, then the GUI.  All seem well.
> > camonitor reports value 0.
> > I restart the IOC, camonitor reports PV disconnected, then it connects and
> >  shows value 0. So far so good.
> > Now I click the push button, camonitor reports value 1.75 as it should.
> > I restart the IOC, camonitor reports PV disconnected, then it connects and
> >  shows value 1.75!
> >
> > From now on, after restarting the IOC, the ai record ends up with
> > value=1.75, even though I am not clicking the push button.  Appears that
> > the ao record is getting processed when the push button connects to the
> > PV when the IOC starts up.  This continues as long as the QT GUI is up.
> > When I stop the QT GUI and restart the IOC, then restarting the IOC does
> > not get the value transferred from the ao to the ai record.
> 
> This sounds like it has to be an epicsQt issue.  Try setting the TPRO field of
> your TEST:AO:TEST record in the .db file; that results in a message being
> printed on the IOC console whenever the record processes, and it tells you
> which thread is causing the processing on restarting the IOC.  I'm going to
> bet that you'll see it coming from the same CA thread as when you first push
> the button.
> 
> > Am I doing something wrong configuring the epicsQt push button or is there
> >  a bug in the epicsQt CA part of the software?  I am assuming that this
> >  behavior is not built in intentionally.
> 
> Does epicsQt have more than one kind of push button?  I would like for
> something like a momentary action button if there is an alternative you can
> use.  It sounds like the one you're using is designed to restore the last
> value it sent when the IOC reconnects, which isn't what you actually want it
> to do.
> 
> HTH,
> 
> - Andrew
> --
> An error is only a mistake if you don't learn from it.
> When you learn something from it, it becomes a lesson.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System