Hello to All:

I use USB to transfer data. the device is
/dev/ttyUSB0. but when I use type command >minicom,
this error message occured: "Device /dev/ttyUSB0 lock
failed: Operation not permitted". I don't know how to
fix it? These days I tested my program by minicom, it
is always OK. but today failed. Would you please tell
me how to do that ? Any help is appreciated.

Thanks.

Michael

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