Features:
The 3 pin jumper selects 5V and 3.3V.

Typical Applications:
- USB Industrial Control
- USB to RS232 / RS422 / RS485 Converters
- Upgrading Legacy Peripherals to USB
- Cellular and Cordless Phone USB data transfer cables and interfaces
- Interfacing MCU / PLD / FPGA based designs to USB
- USB Audio and Low Bandwidth Video data transfer
- PDA to USB data transfer
- USB Smart Card Readers
- USB Instrumentation

Driver Support:
Drivers are available to work with the following operating systems :
Windows Vista x64, Windows XP x64, Windows Server 2003 x64,
Windows Vista, Windows XP, Windows Server 2003, Windows 2000,
Windows ME, Windows 98, Linux, Mac OS X, Mac OS 9, Mac OS 8,
Windows CE.NET (Version 4.2 and greater)

The drivers listed above are all available to download for free.
Various 3rd Party Drivers are also available for various other operating systems - see the FTDI website for details.

When you want to use the FTDI board you have to connect the RX to the TX of the device, and the TX of the FTDI board to the RX of the device. The only way to make the FTDI board works, the lines between the device (microcontroller) and the FTDI board must be crossed.

Links:
Manual - http://www.sigma-shop.com/manuals/ftdi_manual.pdf  (323 KB) 
Drivers - http://www.ftdichip.com/Drivers/VCP.htm
Support forum - http://www.sigma-shop.com/board/