HTPFTrain function. Control both outputs on a Power Function receiver set to the specified channel using the HiTechnic iRLink device as if it were an IR Train receiver. Valid function values are TRAIN_FUNC_STOP, TRAIN_FUNC_INCR_SPEED, TRAIN_FUNC_DECR_SPEED, and TRAIN_FUNC_TOGGLE_LIGHT. Valid channels are PF_CHANNEL_1 through PF_CHANNEL_4. The port must be configured as a Lowspeed port before using this function.
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