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Check this video at 8:05, see if that helps.  My guess is that the RX1 pad is and un-inverted UART input, and the SBUS pad goes through an inverter first before it hits the UART.  I did not watch the whole thing to see which port he configured as Serial RX, but I would guess it would be easy enough to test and find, but my guess here is port 1.


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