Code:
                                  VCC
                                   |
                                  | | R
                                  |_|
      _________  TX                |                      TX ________
      |MAX232  |-----------|<|-----+----------|>|------------|USB    |
      |        |                   |RX                       |       |
      |        |               ____|______                   |       |
      |        | RX         TX| µC        |               RX |       |
      |________|-------+------|___________|        ----------|_______|
                       |___________________________|
sast