Hi all…
I’m really desperate 
I’m new to this hobby and I’ve spent days trying to understand how should I connect and configure my system… made by a Radiomaster TX16s + RFD-TXMOD v2 on the GS, RFD868ux + Pixhawk4-mini on the vehicle.
RFD radios are working as expected… I see the green led on both and I can connect the TXMOD and R/W settings on both modules…
What I do not understand is how to setup TX16s w/ YAAPU script… I’ve followed the hints reported here regarding the S16, S17, S18, S19 registers but it does not work for me… I start thinking that maybe my wiring are wrong… especially between RFD868ux and the Pixhawk-4 mini.
At the moment, I have connected the 10pin JST cable that comes with RFD868ux to the Pixhawk-4 mini Telemetry1, PPM and MAIN-OUT8 ports:
PIXH2 to RFD900ux Telemetry cable
with this wiring, I was able to control the plane (fly-mode, servos, arm etc) using PPM on TX16s and with the following settings:
| LOCAL RADIO | REMOTE RADIO |
|---|---|
| S16=1 GPI1.1 RC-IN | S16=0 GPI1.1 RC-IN |
| S17=0 GPI1.1 RC-OUT | S17=1 GPI1.1 RC-OUT |
| S18=0 GPI1.1 S.BUS-IN | S18=0 GPI1.1 S.BUS-IN |
| S19=0 GPI1.1 S.BUS-OUT | S19=0 GPI1.1 S.BUS-OUT |
…but YAAPU script was not working…
Then I’ve try to enable the S.PORT and to move from PPM to S.BUS but without success… as reported before, S.PORT is enabled on the TXMOD but when I select S.BUS on the TX16s it does not seems to work.
In one of this thread message there are some notes regarding SERIAL_6 and SERIAL_7… I suppose these are not applicable to my case as Pixhawk4 mini don’t have a SERIAL7…
NOTE that the Pixhawk4 RX-IN port is not used so far… do I need a special cable like this one ?
I’m also a little bit confused about the relations between PPM, S.PORT, S.BUS, F.PORT and Mavlink… shouldn’t the latter be enough to pilot the plane and to receive telemetry ?
Any hints will be really appreciated…
thanks,
Giampaolo