Troubleshooting - l-com RS-422 User Manual

USB to RS-422 / RS-485 Adapter

Troubleshooting

1. Windows XP cannot find Drivers for My Device
This error can occur if the VID and PID programmed into the device EEPROM do not match those listed in
the INF files for the driver. The VID and PID programmed into the device EEPROM may be found by using
the USB View utility from the FTDI web site. These can then be checked against the VID and PID entries in
the driver INF files. If they do not match, that driver cannot be installed for that device without either re-
programming the device EEPROM or modifying the list of VID and PID numbers in the INF files.
Please note that only your own company VID and PID or FTDI's VID (0x0403) and FTDI PID issued for use
by your company should be used in the EEPROM and INF/INI files.
End customers should obtain modified drivers from the OEM of the device, and not necessarily edit the
files themselves.
2. Windows XP Forces a Reboot after Installing a Device
This problem can occur if an application is accessing a file while the New Hardware Wizard is
trying to copy it. This usually occurs with the FTD2XX.DLL file. Selecting not to restart the
computer then unplugging and re-plug the device may allow the device to function properly without
restarting. Restarting the machine will allow the device to work correctly.
3. Driver Installation Fails and Windows XP Gives Error Code 10
Windows error code 10 indicates a hardware error or failed driver installation. This error may appear if a
device has insufficient power to operate correctly (e.g. plugged into a bus powered hub with other devices),
or may indicate a more serious hardware problem. Also, it may be indicative of USB root hub drivers being
incorrectly installed.
Please refer to the example schematics on the FTDI web site for standard device configurations. If the error
persists, please contact the FTDI support department.
4. Windows XP Displays An Error And Then Terminates Installation
If the following screen is displayed with this message, Windows XP has been configured to block the
installation of any drivers that are not WHQL certified.
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