Using the TTL port

[AlbertW]

He's talking about the TTL (Transistor-Transistor Logic) port on the 2004 Robot Controller.

The TTL port is a direct link to the User Processor in the RC and is basically a non-level-shifted version of the program port (which is RS232). Both of them can be used (with or without level-shifting) to communicate with other serial devices like CMUcams, computers, other RCs, and so forth.

In short, it's another serial port. How do you use it in the progrmaming? Don't ask me.

Oh, and the pinout (as copied from the Innovation FIRST RC reference guide) is

From left to right, +5v, TX (transmit), RX (recieve), B (ground)