I have a question regardin connecting pin 15 of RFD to a FRSKY receiver.
it mentionned that a logic level shifer / diode or resistor mght be needed as pin 15 of RFD is not 5v tolerant.
I have seen many people connect pin15 directly to X8R, L9R or RXSR from frsky.
Do you know if it is okay and could you explian why ? and how to detect receivers that are compatible ?