Matek F405-WING Telemetry radio on UART 4

ArduPlane Plane 4.0
1

I’m trying to wire up an F405 with the following accessories:
FrSky Rx on SBUS + S.Port
Telemetry Radio (Tried on UARTs 3 and 4)

FrSky Rx and telemetry working fine, but I can’t get the secondary 915MHz telemetry radio to work. It’s bonded with a solid green light, and wired to UART4. I set SERIAL3_PROTOCOL = 2, but still not working.

Any tips or hints appreciated!

Thank you

2

For Matek f405 wing we have:

  • SERIAL1 = Telemetry1 = USART1
  • SERIAL2 = empty, USART2 used for RCInput
  • SERIAL3 = GPS1 = USART3
  • SERIAL4 = GPS2 = UART4
  • SERIAL5 = USER = UART5
  • SERIAL6 = USER = USART6
    So, if you have radio wired to uart4 you need to configure serial4 instead of serial3
3

I saw a SERIAL0 and assumed it was a different count order. Tried that and didn’t work.

I’ve re-installed it in UART1, but still not able to get a MAVLink connection. Lights up green solid on both units, but times out trying to connect.

In Mission Planner, when I go to setup the SIK Radio, it fails when I click “Load Settings”. If I disconnect and just load settings with the USB base station receiver local and remote populate ok.

Not sure what I’ve got wrong.

4

Did you have correct serial protocol and baud settings correct for serial 1?

Also some radios does not support mavlink2. Please try mavlink 1

1 Like
5

I solved it! Tx/Rx reversed in the documentation from cheap amazon radio.

I was plugging Tx to Rx and Rx to Tx on the UARTs like one should, but their labeling was backward.

Mavlink 2 works as well.

2 Likes
6

Damn, I had the same problem… I probably have the same cheap radio. Thank you so much for sharing your solution, I wouldn’t have thought of inverting them.

7

So the Matek F405-Wing will work with FRSky S.Port. Which protocoll did you use? Number10 (FrSky FPort Passthrough)?
Is it possible to connect the F405 direct to the S.Port or will i need an inverter?

1 Like
8

Same setup here. Have you find a solution ? Need inverter or not? Fw version of ardu 4.0.6 or 4.1x dev?

9

Not possible without inverter.