ROS port roslaunch (IMU) problem /dev/ttyUSB0 to /dev/ttyACM0 ?

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Hi,

I am new to ROS but i am trying to observe my IMU system it's a 9dof razor IMU SEN 140001. I followed this tutorial : http://wiki.ros.org/razor_imu_9dof I have actually a problem who's that everytime i do this command :

roslaunch razor_imu_9dof razor-pub-and-display.launch

I got my * /imu_node/port: /dev/ttyUSB0 into my parameters however i would like it to be ttyACM0

I tried a lot of things, my_razor.yaml is already like this :

## USB port
port: /dev/ttyACM0

Also my .launch code is this one :

<launch>
  <arg name="razor_config_file" default="$(find razor_imu_9dof)/config/my_razor.yaml"/>
  <node pkg="razor_imu_9dof" type="imu_node.py" name="imu_node" output="screen">
    <rosparam file="$(arg razor_config_file)" command="load"/>
  </node>
  <node pkg="razor_imu_9dof" type="display_3D_visualization.py" name="display_3D_visualization_node" output="screen">
  </node>
</launch>

I have also tried to go in the imu_node to modify the port but it didn't change anything. And to use the command : rosparam set imu_node/port /dev/ttyACM0 but it didn't worked. I feel like everytime i roslaunch whatever I do it set the port to USB0

Could someone help ? I tried a lot of things i saw on Internet so I am finally posting here. Thank you for your help.