How to make wire connections to run the board in UART mode

[mink007]

I got the S42C board. The calibration sequence works and I was able to run the motor through step pulse.

I want to try the UART mode as that is what will actually make the closed loop system. Essentially sending one time settings command through UART. Then sending UART position command to run the stepper motor and then query(send UART command) the S42C board to get the actual(real) position of the shaft. This will make the board fully closed loop.

For this if UART tutorial can be expanded a bit that covers the UART wiring and an STM32 based example (say on SKR3 or SKR2) would be really helpful. Right now i only see UART commands in the tutorial but the tutorial does not mentions about how to make UART connections.

Thank you.