Thanks again, sorry for not stating the problem clearly.

The problem arose (probably) at a brief power failure, i.e. an abrupt 
shutdown followed by restart once power returned.
(syslog shows the pc restarting just after data capture stopped)


Under normal conditions, with owserver running and functioning, it comes 
up nicely after a normal reboot. No problems.

(I think I have seen the same with my home PC,  but then physically 
unplugging/replugging the LinkUSBi is of course easy, and solves the 
problem)


Arne


On 09.12.2013 22:05, Jan Kandziora wrote:
> Am 09.12.2013 21:53, schrieb Jan Kandziora:
>> I had the impression the system hangs *because* of the reboot. If it's a
>> coldplug issue (yes, such errors exists), removing the USB modules would
>> help, as it would help to *hot*plug the device.
>>
> Another idea in that direction: Are you sure there isn't any other
> service which could grab /dev/ttyUSB0 during boot? The networkmanager
> modem component could be the culprit. Even if it don't run anymore when
> you start your application, it could irritate the LINK adapter so it
> fails afterwards.
>
> Or do you ever encountered a clean setup immediately after reboot?
>
>
> Kind regards
>
>       Jan
>
>
>
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