Try a different cable - one you know works to exchange data. A lot of micro-USB cables are made as 'power-only'. If you picked up one that came with a device that only needed to charge and not exchang

#uart

The obvious indication would be that there's something wrong with the wiring of the DIR pin to the RA driver. Try switching the RA and DEC drivers and see if the problem follows the driver (problem wi

#uart #EQ3

As Howard said, OnStep cannot use the UART interface. You can still use the TMC2209, but you are limited to microstepping of: 64,32,16,or 8. Not a real limitation though, since it covers the range we

#mks #tmc2209 #fysetc #uart