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If running with dual z stepper drivers, the last driver probably needs to be connected to AUX1 - but which pins to use for RX/TX (available pins are A3, A4 - as D1 and D2 most likely is used for serial communications on the USB port) ?
If running with dual z stepper drivers, the last driver probably needs to be connected to AUX1 - but which pins to use for RX/TX (available pins are A3, A4 - as D1 and D2 most likely is used for serial communications on the USB port) ?