I have several Cheetah 1.1 and 1.1b boards. The older ones have different markings on the USB pins. As expected, they read GND, DP, DM, and UVCC. The same pins on my new boards are TX, RX, GND, 3.3V. Are those accurate? was the 1.1b USB pinout changed to Serial?
If so, how do I set up 3 wire serial to use it with RPI and Klipper?