I think that connecting OpenCR to PC is something wrong. If you have a issue with turtlebot3, please visit our github. https://github.com/ROBOTIS-GIT/turtlebot3/issues We will help you. --- [Visit Topic](https://discourse.ros.org/t/turrtlebot3-and-opencr-fx0200-error/7629/3) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: