I have ROS compatible robot that is controlled from laptop. The laptop is connected to the robot's wifi and running on ROS Melodic.

I want to add sensors, in this case a Hokuyo UTM-30LX Lidar to the same network. The lidar will be connected to another computer, such as an intel NUC. I want to simultaneously control the robot and collect data from lidar from a central laptop where ROS is running.

Can you give me an overall idea to make the system work in ROS?

The Hokuyo Lidar has an ethernet cable and a 4-pin connector. The available resources suggest that the lidar should be connected using a USB. Do I need to convert the 4-pin to USB? Or, I can use the ethernet both for powering up and data transfer without using the 4-pin.