Raspberry PiでUART

python uart

http://www.raspberrypi.org/phpBB3/viewtopic.php?t=38671&p=321640
USB Serialについて。PC接続想定のオハナシ

How to use GPIOs on raspberry pi (Simple I/O, PWM and UART)

https://sites.google.com/site/semilleroadt/raspberry-pi-tutorials/gpio

RXD (GPIO15) と TXD (GPIO14)を使ってUART通信をやるやり方