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When using S. BUS mode, the air unit needs to connect the DSM/S. BUS RC port of
Pixhawk4.
5.2.1. FRSKY remote controller
PPM mode
Model setup - Trainer - mode, if mode is configured to Slave/Jack, then the remote
controller is in PPM mode.
Model setup - Internal RF, it is needed to be configured to off, S. bus mode will be
closed.
S.BUS mode
Model setup - Internal RF: LR12, D8, D16, OFF. Configuration of different parameters
is according to the receiver. If configured as off, S. bus mode will be closed.
