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Explanation: I don't think "front cover" has anything to do with it. The command button generates a signal and the cycle is started when the rising edge of this signal reaches the equipment. "Rising edge" and "falling edges" are standard terms in electronics and refer to what you see on an oscilloscope: the signal goes from -1V to 0 or from 0 to 1V, for example, and that is the rising edge. When it returns from 0 to -1V or 1V to 0, that's the falling edge.
Hope that helps you avoid a mistake?