DJI O3 Air Unit - Manual (Page 15)

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Canvas Mode
Canvas Mode enables the flight controller to display OSD elements (such as battery voltage and flight
distance) on the screen of the goggles. Users can configure which OSD elements to display and where
to display the OSD elements on the screen using the Betaflight Configurator software.
Canvas Mode is compatible with Betaflight 4.3.0 and later.
1. Hardware Connection: connect the UART RX of the air unit to one of the UART TX serial ports (take
UART4 as an example) of the flight control board.
2. Configuring UART: open the Betaflight Configurator software and select Ports. Turn on the MSP
switch for the corresponding UART TX serial port (UART4) and set baud rate to 115200. Click Save
and Reboot.
3. Configuring CLI:
Select CLI from the Betaflight Configurator software and make the following configuration:
1) Set the osd_displayport_device to MSP:
set osd_displayport_device = MSP
2) Specify the MSP serial port number. The number here should be the MSP UART TX serial port
number minus 1. In this example, it should be 3.
set displayport_msp_serial = 3
3) Save and exit:
save
Canvas Mode initial setup is complete.