The next thing to do will ne to get your multimeter out and start checking voltage values on the FC connector pins. But before you do that can you please post some photos of the FC and your wiring between the FC and receiver so we can confirm if the manual you posted a link to is for the exact same FC you have.

   

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Had to insanely crop it in order for it to be allowed so that's the best I could do

OK, that explains it. The manual you posted a link to is for a different version of the S-Tower FC. Your version of the FC (HERE) looks like the one in the image below.



You therefore need to connect your receiver to the white connector on the top left instead as shown in the image below with a "SBUS/PPM Receiver" wired to it:-

• SBUS OUT pin from the connector of the R-XSR to the SBUS/PPM pin of the Raptor connector
  
• +5V pin from the connector of the R-XSR to the 5V pin of the Raptor connector
  
• GND pin from the connector of the R-XSR to the GND (-) pin of the Raptor connector
  

As per before, the SBUS IN and S.Port pins on the R-XSR will be left unconnected.




Once you've done the wiring, connect up Betaflight Configurator, go to the Ports tab and make sure the "Serial RX" switch is set to ON for UART1 and to OFF for all other UARTS. For UART1 also make sure that all other options are set to DISABLED to avoid any conflicts. As Voodoo mentioned before, if MSP is switched on for any of the UARTs then just leave that switched on.

What's the cable that I need for that and where can I buy one? The receiver and the drone didnt come with one for that.

The FC should have came with a cable. So you have to splice the R-XSR cable and the FC cable together.

It only came with a cable that could fit in the middle port on the left side, the spektrum port

I am not 100% sure but those connectors look like JST-SH.

That is odd, from all the photos online, all three cables should have came with your FC.

That's just my luck, the only other cable I have it the sbus one for flashing the r xsr and I dont think I should cut that one

(22-May-2019, 03:06 AM)voodoo614 Wrote: I am not 100% sure but those connectors look like JST-SH.

That is odd, from all the photos online, all three cables should have came with your FC.

Yeah, I think you're probably right although it's not always easy to tell from photos. A bit of trial and error may be required.

It looks like this Raptor stack was supplied already installed in an RTF quad, so whoever the manufacturer is clearly didn't provide all the spare FC cables that came with the stack, which is a poor show because at the very least the consumer needs to wire in their own receiver.

(22-May-2019, 03:15 AM)Alopolo Wrote: That's just my luck, the only other cable I have it the sbus one for flashing the r xsr and I dont think I should cut that one

Another option is to just solder wires from the R-XSR directly to the exposed pins on the back of the FC connector, but you will need a very fine soldering iron tip and good soldering skills otherwise it will be easy to melt or mangle the connector in doing so.

Or just de-pin the connector completely leaving the connector pads that you can then solder the R-XSR wires to directly. The easiest way to do that is to carefully cut away the plastic of the connector leaving just the soldered pins remaining which you can then desolder and remove, one at a time.