I have an Ardupilot 2.5 and I’m trying to communicate on both the 3DR radio (ground station with APM2) and USB serial (RPi to integrate with onboard systems) simultaneously.
If I connect only USB to RPi or Windows, I get comms. If I power USB port with battery and connect only radio, I get comms. If I connect both, I only get comms over USB and nothing over radio (green radio light, no red flashing). I have used raw terminal programs in both cases and see no data flow on the radio.
Does anyone know why I do not get any comms over radio when using USB comms?
Thanks for the quick response. I have come across a variation of this page before that gave me the idea that the solder jumpers force selects one UART or another, but now I understand that the default setup auto selects a UART and changing the solder jumpers will force USB onto UART 0 and radio onto UART 2, allowing simultaneous comms. Is this correct? Is there a reason why the default is automux, since this seems more restrictive?