How to select the Sparkfun LG290P RTK GPS module Serial-B output with Raspberry Pi

GPS/GNSS
1

Hi All,

I presently have a Sparkfun RTK Postcard running successfully as a Base Station outputting RTCM3 messages on a 915MHz telemetry link.

I recently purchased a SparkFun Quadband GNSS RTK Breakout - LG290P module for my Rover. I am familiar with the ZED-F9P module which I use on my Rover to feed NMEA correction messages to the Rover Raspberry Pi 4B+ and the RPi has no problem receiving those NMEA correction messages over one of its USB ports.

My concern is that the SparkFun LG290P module has two Serial ports available on its USB output port, a Serial-A for configuration and a Serial-B for NMEA messages. So how can my Rpi 4B+ USB input distinguish between the Serial-A and Serial-B ports so that the RPi 4B+ can monitor only the NMEA messages on the LG290P module Serial-B USB output?

Will the LG290P module Serial-A and Serial-B USB outputs appear as two different virtual serial tty inputs to the RPi 4B+ USB input?

Any help will be greatly appreciated.

Regards,

TCIII

2

When you attach the GPS to your computer/Pi, it will generate two COM ports. Just select the one you want to communicate with and you should be good to go.

1 Like
3

@YellowDog

Thanks for the response.

I did find the following after an extensive search of the GPS/GNSS Forum: “On my system they come up as ttyACM0 and ttyACM1 - and for me ttyACM1 is the one with data, but that can change."

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