Problem with setting up LC29H(BS)

IoT Modules GNSS Module
1

Hello everyone,
I’m working with two GNSS modules – LC29H(BS) and LC29H(DA), both running the latest firmware versions. I’m trying to achieve RTK positioning via UART communication between the two modules, but so far without success.

I suspect the problem lies in the configuration of the BS module.

In the attached image, you can see how the two modules are connected. The jumpers on the BS module are set to position B. On the DA module:

  • the jumper for data reception is in position B,
  • and the one for data transmission is in position A.

This setup allows me to monitor the DA module in real time.
The antenna of the BS module is fixed and placed under open sky.

Apologies for the poor image quality – I was only able to upload one image, so I combined all the pictures into a single one.

I’d really appreciate it if someone could take a look and let me know where I might be making a mistake or what I may have missed in the configuration.

Thanks in advance!

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2

Hi Noovas,

The PCB board on your side is a third-party design. I’m not familiar with it, but I try to support.
My suggestions:
(1) How did you set LC29H(BS) fixed? Is it a survey-in mode or fix mode?
(2) If you set a survey-in mode, how long was the survey-in duration you set?
It’s recommended to set at least 10minutes (600seconds) if you implement a quick test.
(3) You should connect TXD on BS to RXD on DA. I guess it was a picture marked error in your screenshot.
(4) After BS survey is finished, remove all the jumers on BS board, and then connect TX test point on BS to RX test point on DA.
On DA board, set the jumper to “USB-LC29H”.

Best regards.

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3

Hi Raphael,
thank you for the support. I found the answer here: LC29H BS connected to LC29H DA but no RTK fix? - #2 by bamarcant.
I removed R13 and R14 as Benh119 said and it works. Now I have RTK fixed.
Schematic is correct pin RX is for transmitting data and pin TX is receiving data! I cant say that marking is wrong, because this connector is for Raspberry Pi… maybe there logic was RX goes to RX to the Raspberry and and TX goes to TX to the Raspberry.
Again thanks, Raphael !

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