I have selected DCS52 USB Interface
Serial Port:- ttyACM0 - this is the only choice I am offered
Command Station Type - DCS52 (Zephyr Express)
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The log shows you are trying to setup a Locobuffer USB for your DCS52 zephyr Extra.??
Since the DCS52 has built in PR4, why did you select Locobuffer as a connection type ?
Unless? you have and are trying to use a Locobuffer,? this might be your error. You should have selected the? DCS52 USB Interface in PREFERENCES and let it use the Integrated PR4.
Marc