Ok had a look at, and have a little better understanding of your system I think!
So you are using a DJI radio?
and from what I can gather the Tx and Rx are for the Telemetry, and you have Telemetry?
The Sbus is for the Radio channels, 8 of them with the Dji radio?
The Tx, Rx and Sbus are low voltage networks that must not go over 3.3v
Found this
