If you have multiple USB devices plugged in, you just have to cycle through the devices until you select the correct one (there are other methods to detect the device and identify the specific USB port but it requires knowledge of operating in terminal). If the A5 is being read properly via the USB port, you should only see a single device with “.usb” and some numbers, this is most likely your A5. Once that info is saved take a gander at the bottom right of Lightburn again, directly next to “devices” is the port selection. Make sure your laser is in the middle of the work area (just for the initial connection). “Find my laser” never worked for me properly on my Mac, (I also use a MBP with USB-C to USB adapter) so select “create manually”, then select “GRBL”, click ‘next’, then select “serial/USB”, choose a name for it and set the appropriate X and Y length, for the A5 it is 410x400mm. Once you’re in Lightburn, select ‘Devices’ from the bottom right. The laser should be powered on before starting up the application.
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