An optical communication probe enables a diagnostic tool to optically communicate with an external device, such as an appliance, through a low intensity indicator light of the external device. The communication probe includes an optical transmitter, an optical receiver, and a voltage converter for converting a first voltage signal received from the diagnostic tool to a second voltage signal. The second voltage signal is coupled to the optical receiver to operate the optical receiver in a high speed mode.

 
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> Virtual data entry device and method for input of alphanumeric and other data

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