Hi Folks,
i added the udev rules already

1. lsusb:
Bus 003 Device 004: ID 16c0:0483 Van Ooijen Technische Informatica Teensyduino Serial

2. ls -l /dev/ttyU* /dev/ttyA*
crw-rw-rw- 1 root dialout 166, 1 Sep 2 18:58 /dev/ttyACM1

3. picocom -eq -b9600 /dev/ttyACM1
:GU# nNpHzE0#
:GR# 03:06:34#
:GD# +90*00:00#

So it seems to work. I think the trick was in restarting the onstep, and not only in rebooting the system.
Many thanks!

Regards,
Gerrit

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