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C51: USB DONGLE NOT RECOGNIZED


Information in this article applies to:

  • C51 All 7.xx Versions

PROBLEM

An LPT dongle works on a PC, but a USB dongle does not. The latest Sentinel drivers for the USB dongle are installed, but µVision still displays

warning C500: MISSING DEVICE (SECURITY KEY NOT FOUND)

when the project builds. Windows Device Manager shows the correct USB device. What could be wrong?

CAUSE

Installing a Serial Number or an Add-on Disk designed for LPT dongles will cause this warning. USB dongles require a different Serial Number and Add-on Disk than LPT dongles.

RESOLUTION

Install the Keil tools using the Serial Number and Add-on Disk supplied with the USB dongle.

If you are changing from an LPT dongle to a USB dongle on the same PC, you may either:

  • Install the Keil tools in a different folder using the Serial Number and Add-on Diskette provided with the USB dongle, or
  • To use the same installation folder name, uninstall the Keil tools, delete the installation folder and then re-install the Keil tools using the Serial Number and Add-on Diskette provided with the USB dongle.
    Note: Make sure you save any projects, program code or other files you have modified, created or might otherwise need before deleting the Keil installation folder.

MORE INFORMATION

Last Reviewed: Friday, January 12, 2007


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