Qualcomm Flight RB5 Linux User Guide
UARTs
/dev/ttyHS0 - (internal use only)
Used internally by the SOM Wi-Fi/BT.
/dev/ttyHS1 - J12 - RC Input
2 wire UART exposed on J12, by default is used for a RC input for PX4, see voxl.config
/dev/ttyHS2 - J19 - GNSS Input
2 wire UART exposed on J19, by default is used for a GNNS input for PX4, see voxl.config
/dev/ttyHS3 - J8 - Camera Connector UART
2 wire UART exposed on the J8 camera connector.
/dev/ttyHS4 - J3 - B2B pins 3/5
2 wire UART exposed on the J3 board-to-board connector pins 3/5.
Used with add-on boards like M0125 to expose an apps proc UART.
/dev/ttyHS5 - J5 - HS B2B pins 48/49
2 wire UART exposed on the J board-to-board connector pins 48/49.
Used with add-on boards like M0090, exposing the 2W UART on J9 pins 2/3.