LG291P as Base and LG580P as Rover — Can RTK Fix be achieved via UART RTCM connection?

IoT Modules GNSS Module
1

Hello Quectel Support Team,

I am currently testing LG291P and LG580P GNSS modules for RTK positioning.
Here is my setup and observation:

Setup:

  • Base station: LG291P module configured as Base Mode ($PQTMCFGRCVRMODE,W,2*29)
  • Rover station: LG580P module in normal mode (standalone GNSS fix works well)
  • Connection: The UART port on the LG291P EVB board outputs RTCM data.
    I connected this TXD1 to the RXD1 pin of the LG580P EVB board (and GND connected as well).

Observation:

  • The rover (LG580P) can still obtain a standalone GNSS fix,
    but it does not seem to enter RTK float or fix mode after receiving RTCM from the base.

Questions:

  1. Will the LG580P automatically perform RTK positioning when it receives RTCM messages through UART?
  2. Do I need to explicitly configure LG580P into “rover mode” (for example with $PQTMCFGRCVRMODE)?
  3. Are there any additional commands needed to specify which UART port accepts RTCM input?
  4. How can I verify that the LG580P is correctly parsing the incoming RTCM messages?

Any guidance or example configuration would be greatly appreciated.
Thank you!

2

LG291P is a custom board it can handle only Beidu constellation…

3

The issue has been resolved.
The reason was that the LG580P and its corresponding EVB board do not have a direct serial passthrough, so the UART line from the LG291P EVB could not communicate with it.
The solution is to directly use the reserved UART4 interface on the LG580P module to communicate with the LG291P.