UART3: SmartAudio (or any other desired output if SmartAudio is selected to pull signal from the “external” pad, designated RX SA on the top of the FC).
UART6: ESC Telemetry (if applicable).
PinIO (optional, only if selected via the solder bridge):
resource pinio 1 B15
set pinio_box = 39
set vtx_pit_mode_freq = 0
Pit mode “mode” selection in the modes tab will be used to control the vtx. The above CLI commands set the mode switch to control the pin output instead of sending a command to the VTX to go to the “graveyard” channel.
Before: Pit Mode - command VTX to go to its assigned graveyard channel via SmartAudio.
After: Pit Mode - controls output of Pin B15 to output a “HIGH” or “LOW” command which controls the power that the VTX receives.