What happens when Serial1 is directly connected to Serial2/3 on Mega 2560?

Projects Networking, Protocols, and Devices
23

I see... So when you guys say -1, you mean you actually see the funny y on the terminal.

For newbies like me, when I saw the funny y (didn't even know that's what it is called), I looked it up in the ASCII table and communicated it using its ASCII value.