hmm indeed that’s a problem.
Could you open in realterm window 1 COM2, disable the echo checkmark and in the other realterm window COM9.
now place your cursor on one of the black windows (where you normally see the incoming data) and click there. Now start typing random things with your keyboard.
You won’t see what you type but the other realterm window should show it. Another method is to go to the “Send” tab and type some random characters in the top input field, then press “Send ASCII”. Now it should also appear the the other realterm window. If not perhaps your com0com configuration is not working.
Screenshot of my com0com settings: we.tl/7zpZLy1ol4 (They are all default btw)