Spec for mamba405: https://ardupilot.org/plane/docs/common-mamba405-mk2.html

Spec for R-XSR: https://www.frsky-rc.com/wp-content/uploads/Downloads/Manual/R-XSR/R-XSR%20ACCST%20-Manual.pdf

Looking at the two specifications the R-XSR requires both a SBUS In and Out however the mamba405 only has one SBUS connection. Moreover, the mamba405 spec says it only supports "unidirectional protocols", does this mean I can just connect the SBUS out?

Thanks for any feedback


1 Answer 1


RSSI = Received Signal Strength Indicator

The S(Smart) Port connects to the RSSI Pin on the flight controller for the telemetry information.

Only the SBUS out is necessary for most Kwads.



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