Download Free Windows XP Installation Guide.pdf The purpose of this document is to provide users of FTDI chips with a simple procedure for installing drivers for their devices under Windows XP. FTDI have previously provided two types of driver for Windows: a D2XX direct driver and a virtual COM port (VCP) driver. Previously, these drivers were mutually exclusive and could not be installed at the same time. The new Windows combined driver model (CDM) allows applications to access FTDI devices through either the D2XX DLL or a COM port without having to change driver type. However, it should be noted that an application can only communicate through one of these interfaces at a time and cannot send commands to the D2XX DLL and the associated COM port at the same time.

The CDM driver comes in two parts. The bus layer provides D2XX style functionality and is always installed. The CDM driver will determine whether a COM port should be exposed by reading the EEPROM of FT232R, FT245R and FT2232C devices. In the case of FT232BM, FT245BM, FT8U232AM and FT8U245AM devices, the CDM driver will default to always installing a COM port. This behaviour can be changed and EEPROM settings ignored by changing the driver INF files as detailed in AN232B-10 Advanced Driver Options. Please note that modifying the INF files of a Microsoft WHQL certified driver will invalidate the certification.

To install CDM drivers for an FTDI device under Windows 2000, follow the instructions below:
  • If a device of the same type has been installed on your machine before and the drivers that are about to be installed are different from those installed already, the original drivers need to be uninstalled. Please refer to the Uninstalling CDM Drivers section of this document for further details of this procedure.
  • Download the latest available CDM drivers from the FTDI web site and unzip them to a location on your PC.
  • If you are running Windows XP or Windows XP SP 1, temporarily disconnect your PC from the Internet. This can be done by either removing the network cable from your PC or by disabling your network card by going to the "Control Panel\Network and Dial-Up Connections", rightclicking on the appropriate connection and selecting "Disable" from the menu. The connection can be re-enabled after the installation is complete. This is not necessary under Windows XP SP 2 if configured to ask before connecting to Windows Update. Windows XP SP 2 can have the settings for Windows Update changed through "Control Panel\System" then select the "Hardware" tab and click "Windows Update".
  • Connect the device to a spare USB port on your PC. If the device is based on the FT2232C, the Microsoft composite device driver is automatically loaded silently in the backgound. Once the composite driver has been installed Windows Found New Hardware Wizard will launch. If there is no available Internet connection or Windows XP SP 2 is configured to ask before connecting to Windows Update, the screen below is shown. Select "No, not this time" from the options available and then click "Next" to proceed with the installation. If there is an available Internet connection, Windows XP will silently connect to the Windows Update website and install any suitable driver it finds for the device in preference to the driver manually selected.