Remove pre-release driver versions on a Windows XP operating system

 
  1. Click Start > Control Panel > Add or Remove Programs.
  2. Select 770 USB Serial Converter Drivers from the list, and then click Change/Remove.
    If 770 USB Serial Converter Drivers is not on the list, proceed to 4.
  3. Follow the prompts on the uninstallation window, then click Finish.
  4. If necessary, uninstall the drivers using Windows Device Manager:
    1. Launch Windows Device Manager (Start > Run, type devmgmt.msc, and click OK).
    2. Expand Ports (COM & LPT).
    3. Connect the USB Fieldbus Interface to the computer through the USB port and wait a few seconds to see if 770 Fieldbus Interface (COMxx) appears on the list. If it does not, proceed to 5.
    4. Right-click 770 Fieldbus Interface (COMxx), and select Uninstall.
    5. Click OK to confirm the driver removal.
    6. Expand Universal Serial Bus controllers, right-click 770 Fieldbus Interface, and select Uninstall.
    7. Click OK to confirm the driver removal.
  5. After removing previous driver versions, install current drivers manually.
    Follow the procedure in Install drivers manually.
  6. After installing current drivers, open Windows Device Manager.
  7. Expand Ports (COM & LPT), right-click 770 Fieldbus Interface (COMxx), and select Properties.
  8. From the Port Settings tab, select Advanced.
  9. From the BM Options section, set the Latency Timer value to 1 and click OK.

    Advanced Settings for COMxx dialog

  10. Click OK to close the Properties dialog.