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Answered on Github issue ticket here: https://github.com/ros-drivers/urg_node/issues/5
Please provide a list of your current parameters, as well as the specific device and firmware version for your Hokuyo.
Additionally, please check permissions on /dev/ttyACM0 by running 'sudo chmod 777 /dev/ttyACM0'.
It's also possible your laser is communicating using SCIP 1.0, please try updating the firmware on your laser to the latest version. See more information here: http://ros-users.122217.n3.nabble.com/hokuyo-node-error-td921464.html