Pixhawk 6X Pro share the same target as Pixhawk 6X

PX4 Autopilot

If you are using PX4 Autopilot, please refer to the PX4 user guide page for additional information.
Holybro Pixhawk 6X | PX4 Guide (main)
Holybro Pixhawk 6X Wiring Quick Start | PX4 Guide (main)

Ardupilot

If you are using PX4 Autopilot, please refer to the PX4 user guide page for additional information.
Pixhawk 6X Flight Controller Copter documentation