dazkit

You have to set that yourself. The ones marked in the red rectangle are the uart pins. For uart you only need the #uart_pin. You can delete the #tx_pin reference....

The sb2209/sb2240 is an inspiration from hartk Stealthburner Toolhead Board. The spacer is from hartk https://github.com/hartk1213/MISC/blob/6e4f22c85e541eafab4471c52c59f51c7ac6b2b8/PCBs/Stealthburner_Toolhead_PCB/STLs/pcb_spacer.stl

and of course this is missing in the manual