-*- mode: outline -*-

* Pinout.

Rx/Tx
RTS/CTS/DTR/DSR

* Level signals converts.

** MAX 232.

From an RS-232 serial port to signals suitable for use in TTL circuit.

  http://en.wikipedia.org/wiki/MAX232

* USB to COM chip.

** PL-2303.

  http://www.prolific.com.tw/eng/products.asp?id=59
                about/overview
  http://www.prolific.com.tw/eng/downloads.asp?ID=23
                datasheet download page
  http://www.prolific.com.tw/eng/downloads.asp?id=31
                driver download page