FrSky RX4R / RX6R inverted S.PORT pin

[trondgzi]

Hi! Can the inverted S.PORT pin be used for OpenTX integration? The manual says to never connect power to SYS, but will it work with inverted S.PORT signal and ground only?

[p.i.engineer]

He'd need to allow half duplex for that to work.

the sys connector is TX, RX, G. So it's full duplex.

I tried a few months ago to put a diode on the tx pin so it wouldn't receive the messages from inverted s.port, but it didn't work.

[ZeXx86]

Hi,

in theory it can be used. S.PORT is always running in half duplex mode. But wiring must be correct. VCC can't be connected there.
I can help only with unmodified S.PORT wiring.