I'm trying an Omnibus F4 V5 in one of my builds. I'm having issues getting it to talk to the radio, in PPM, SBUS or IBUS. (I've succeeded with different Omnibus boards, e.g. the various HGLRC ones).
IBUS: I have the signal wire soldered to RX1 on the board (non-inverted). I also tried J7 (just in case) but that doesn't work either. Dronin's showing -1 on all input channels in both cases, and doesn't recognize any movement from the sticks.
SBUS: Soldered to J7. No response to radio stick movement in manual or wizard.
PPM: Soldered to J7. No response to radio stick movement in manual or wizard.
Receiver is bound. Radio has the right output mode (in each different attempt.)