Which pins to use for the serial communication for CNC pendant?

Hi everyone, I hope someone can help me out. I have made a CNC pendant based on this project, but I am not sure which pins I should connect it to. I am using a BTT SKR PRO 1.2 mainboard with a BTT TFT35 touch screen. Which pin (tx and rx) can I connect the CNC pendant to?

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From the project you linked (comments)

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Hi! Thanks for your reply. I think my question was not stated clear enough. The pendant I made is done and working, but i don’t know how to connect the pendant to the SKR PRO 1.2. I know I should connect it to tx and rx pins of the SKR, but I am not sure which pins on the SKR PRO 1.2 are tx and rx pins which I can use.

Not sure if the SKR pro v1.2 actually has Tx & Rx (serial) ports as such. Certainly no spares on the board labelled Tx and Rx.

There are serial ports, but they are used for the TFT/display. There is a USB (B) port that I think is effectively a serial connection.

If you plan on using the pendant in place of the display, you may be able to use one of the TFT or Display1/Display2 ports. You should be able to determine which pins are which by using Google to search for the board pinouts…

Alternatively you may be able to find a Serial-USB converter and wire into the DB9 pins from your pendant.

Best of luck