Pixhawk 2.1 pinout doc need to be on the Pixhawk 2.1 page - Website and Documentation errors - ArduPilot Discourse
Pixhawk Overview — Copter documentation
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Pinouts
Here+ RTK USB connection - Pixhawk 2 - ArduPilot Discourse
Pixhawk 4 Wiring Quick Start | PX4 User Guide
Pixhawk Wiring Quick Start | PX4 User Guide
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