I'm trying to read SBUS output value on an arduino board, but All read channels values are fixed and null, expected the channel 3 : 363.
My SBUS reader librairie works with a SBUS RC receiver, and I use an sbus inverter between Pixhawk and Arduino
The documentation suggests that SBUS output is not yet implemented, and the SBUS port is an input. http://ardupilot.org/plane/docs/common-pixhawk-overview.html#common-pixhawk-overview
Does that help?