S.Bus out of Pixhawk Cube doesn't work

I am trying to use S.Bus out of Pixhawk Cube, but it doesn’t work. I have tried to connect digital analyser to this port and always no signal appears. I have tried set BRD_SBUS_OUT to 1 and it still haven’t worked. Where can be problem?

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Problem is in safety switch. Any chynnel of Sbus out cannot by bypassed and output is completely off until safety switch on.