Frequently Asked Questions

Q: Why does the flight controller fail to detect my GPS when it is connected to UART4?

A: Ensure that all serial ports below UART4 are not configured for the GPS protocol (for example, UART2), and that UART4 is configured for the GPS protocol. AP firmware searches for GPS devices in serial-port order and stops searching if it does not find a GPS on a lower-numbered port.

Q: Why does my serial-port order differ from the manual or from other users’ configurations?

A: First confirm the firmware version. In Matek-compatible firmware, Serial numbers do not map directly to UART numbers. In official AET firmware, each Serial number maps directly to the corresponding UART number. We recommend using official AET firmware. If you use Matek-compatible firmware, open the Serial Ports page in Mission Planner to view the mapping between the two numbering systems.