[etherlab-users] X Windows Manager & Network Connection?

[Richard Hacker]

Hello Ian

Are you trying to get an application running in real time to talk to 
your X-screen? If that is true, you're in for trouble IMHO :(

Regards
Richard

Am 02/04/2013 12:06 PM, schrieb Ian Norton:
> Hi,
>
> I have a very strange problem.
>
> I'm running V1.5 in user mode. My app clocks the bus at 1KHz with
> ecrt_domain_queue/ecrt_master_send
> /ecrt_master_receive/ecrt_domain_process and get my data back with
> EC_READ's.
>
> Devices on the bus vary, but include Kollmorgen S300, Festo pressure
> regulators, Beckhof ADC/DAC. I have 7 systems working fine in the field.
>
> So now we've upgraded the Kollmorgen S300's to AKD drives. Fairly
> straightforward move you might think.
>
> Not so! After an internal initial homing process, the angular positional
> data returned from the drive would not show any change, even though the
> attached motor was turning. After a time (variable, and anything from .5
> secs to 10 secs), a new value would be returned which is massively
> different from the previous "static" value, now reflecting the true
> position of the motor.
>
> My app is an X windows program, and by chance I noticed that if I
> perfomed a Window manager function, i.e. move a terminal window on top
> of my app, it kick started new data to be retrieved from the bus!?
>
> The code driving the bus has a heartbeat, which never misses a beat,
> even when returned data is not changing, so I'm happy the ecrt routines
> are being called continuously.
>
> I use ecrt_master_state and ecrt_domain_state to look for errors but get
> none.
>
> So I'm wondering how the master can return the same data to me when it
> is clearly changing at the device. After all, with no errors, it must
> think data has been exchanged.
>
> And, why does an X window manager kick a transfer off? How can it be
> linked to the network?
>
> Anyone had similar issues?
>
> regards
>
> Ian R.K. Norton
> System Support Engineer
> Aircraft Engineering
> Cranfield Aerospace Ltd
> Cranfield
> Bedford MK43 0AL
> UK
>
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Mit freundlichem Gruß

Richard Hacker

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Richard Hacker M.Sc.
richard.hacker at igh-essen.com
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