In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Joe,
  The SX-Key serial version gets it's power from the development board. 
  Make sure you have it plugged into a development board with a good SX chip and powered up.

  Other than that, I would try removing the COM port from device manager and letting your system re-install it.

Bean.

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