So I installed a Radiomaster RP1 on my Axis Manta 3.6 which is running a Argus Mini F7 stack and I'm running into quite the weird issue.

Wired everything up per the diagram on uart 2, double and triple checked the connections so I'm certain nothings mixed up.

The problem is that it seems that this RX seems to only receive inputs from the TX when powered via USB. Plugging in a lipo, the RX turns on, goes solid green as if its bound but get's absolutely no inputs from the TX

Swapping off of the lipo, and going via USB power, everything works as expected. Initially I thought maybe its a bad uart on the board, but heres the weird part. If I connect via USB power first, everything works as expected, from there I can plug in the battery and disconnect the usb and everything continues to work as expected.

Its only when powering initially from a Lipo that the RX doesn't seem to respond to any inputs, I'm sitting here kind of baffled at what it could be.
Everything is updated to 3.3.0, proper firmware, and at this point I feel like I've tried everything apart from swapping RX's.

Do you have a vista or O3 connected to your FC with the SBUS wire? If so, the SBUS may be using the same UART you've connected your RX to so it is interfering, in which case you should disconnect the SBUS wire if you are not using it.

(30-Sep-2023, 09:44 PM)mstc Wrote: Do you have a vista or O3 connected to your FC with the SBUS wire? If so, the SBUS may be using the same UART you've connected your RX to so it is interfering, in which case you should disconnect the SBUS wire if you are not using it.

You're a hero. It's the bnf manta, so yeah looks like they assumed folks were going to be using the o3 link. Pulled out the whole O3 wire to just check and everythings working as it should.

I'll just snip the rx wire on the o3 cable.

Thanks so much!