Essentially what I'm wanting is code that will allow me to set a protocol and baud rate, particularly 2400 8N1, and then send a specified byte from the port, or receive a byte. What I'm doing is some electronics experimentation, and I've got what I need for the other side, so I really just need to send and receive stuff to and from my microcontroller.

P.S. I don't need any circuit diagrams!