Hey @PineOwple,
Welcome to the forum!
You’re absolutely in the right place, and it looks like you’ve already made a great start with your troubleshooting.
I’m not super familiar with this product, so I could be wrong, but one of the first things to check is that the serial port settings match on both ends. From your screenshot, it looks like the COM2 device is set to 9600, 7E1, while the COM4 is using 9600, 8N1, that mismatch would definitely cause communication issues.
