| 摘要 |
<p>Indicator lights of an appliance are used for optical communication with a diagnostic tool through a communication probe. The indicator lights of the appliance are arranged in at least two groups. One indicator light is selected from one group of indicator lights to operate as an optical transmitter and another indicator light is selected from the other group of indicator lights to operate as an optical receiver. Preferably, the two selected indicator lights are in proximity to one another so the communication probe for the diagnostic tool may be more compactly designed.
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