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Make sure that /dev/ttyUSB0 is the correct port for your device:

$ dmesg | grep tty

If using a different serial port, set the ~port parameter appropriately:

$ rosrun sicktoolbox_wrapper sicklms _port:=/dev/XXX _baud:=38400

If the port was correct, check that you are using the right kind of serial cable, have valid permissions, etc.

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