I’m trying to setup the Drotek “M8P RTK XL + compass” with the Pixracer autopilot and separate RTCM radios (where the base sends RTCM messages directly to the Drotek XL).
As you can see from the attached photo, I have successfully configured the radios (standard 433 MHz telemetry modems from Holybro) and base station to send RTCM to the XL: the XL’s RTK LED flashes red, indicating RTK float. The Rover’s radio is configured for 38400 bps on the serial interface.
I’ve connected the XL’s “Rover” port directly to the Pixracer’s GPS port. I’ve configured the Drotek XL UART1 port to 38400 bps (see u-center image at https://drive.google.com/file/d/0BxppH98F8tSbU0gwc1VtaVhub0E/view?usp=sharing). However, the Pixracer never recognizes the attached XL GPS, never displays any GPS lock, HDOP, number of satellites etc.
I’ve also tried swapping the RX and TX lines on the cable connecting Pixracer to the Rover port. For reference the Pixracer GPS port pinout is here: https://drive.google.com/file/d/0BxppH98F8tSbNTBPWmNXMUhWUWs/view?usp=sharing (The GPS port is on the left above the Baro, in this image.)
What do I need to change in my configuration to get the Pixracer to recognize the XL GPS? To be clear I’m running the latest stable PX4 firmware stack on the Pixracer, not ArduPilot.
Thanks for your help!