HOTT Telemetry

ArduPilot firmware versions later than 4.0 supports the Graupner HOTT telemetry.

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Wiring and Setup

Connection to the autopilot is via any UART port’s TX input, although one without RTS/CTS flow control is simpler to configure, since flow control is not required.

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To enable HOTT telemetry, for example on the first TELEM port SERIAL1:

SERIAL1_BAUD set to 19 (for 19.2KBaud)

SERIAL1_PROTOCOL set to 27 (HOTT)

SERIAL1_OPTIONS set to 4 (Half Duplex)