HM30 User Manual v1.3
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4.5 Solutions to Disconnection
When the ground unit is in good communication with the air unit, but it fails to
establish datalink connection with GCS, please try to follow the steps below for
troubleshooting.
1. Confirm if the air unit is wired to the flight controller by correct telemetry cable.
2. If you are using a customized telemetry cable, please check:
⚫ If cable pin map is correct?
⚫ If the TX and RX pins in the flight controller and air unit telemetry port are
swapped?
3. On HM30 ground unit, go to the “Datalink” page and check communication status.
When the communication is good, “data download” is not 0. If it is “0”, please go
back to check step 1 and 2.
4. In “Settings”, go to the “Datalink” option and check:
⚫ If the option is correct?
⚫ If “Baud Rate” matches with your flight controller?
⚫ In the GCS, check if the datalink settings are correctly configured.
5. If it is PX4 / ArduPilot open-source flight controller, please try to switch telemetry
cable connection between the TELEM 1 port and the TELEM 2 port on flight
controller.
6. If both the ground unit and air unit are the latest firmware?
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