Set UART mode with tmc2208 tmc2209 - makerbase-mks/MKS-Robin-E3-E3D GitHub Wiki
Board jumper set
Use a jumper cap to short the SPI / UART side and the third pin. You can also check the silkscreen on the back of the motherboard about the Mode jumper settings
Need to use UART mode axis, use jumper cap to connect accordingly
We use TMC2209 Uart mode for X Y Z E0 axis, follows: