DMX over Serial Port

what is wrong with these pictures?

This is what the UNIX tty device was developed for And this is what we use it for
[Siemens Teletypewriter] [Stage full of movinglights]
A teletypewriter: 50Baud 5N2 A set of movinglights: 250kBaud 8N2

Answer: They may both be controlled by the same kind of technology, the tty driver.

[UART DMX layer overview]