Shapeoko 3 XXL + Raspberry Pi 3 + CNCJS + Tablet

I hope that it is working for you now. The default baud rate for GRBL is 115200. Older version use a slower rate and I believe that you can recompile GRBL to use something else. But, again, the standard is 115200. Also, the controller should be connecting to a ttyACM port like you’re seeing. ACM stands for abstract control model and it is a standard subtype for USB communication devices. Basically, it allows USB to act like a serial port and should be compatible with the older RS-232 communication standard. None of that particularly matters other than that is how it should show up in CNCjs.

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