Xbee 3 wireless link between F9P GPS receivers

XBee & XBee Gateway
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1

I want to send RTCM correction messages from the Sparkfun F9P base to F9P rover via Xbee. I have RTK fixed mode on my rover F9P using a wired connection, so I know the two F9P’s are correctly configured per Ublox’s Moving Base Application Note. I now want to replace the wired connection with a wireless connection between the bas and rover GPS’s.

Following Sparkfun’s advice, I configured my two Xbee 3 firmware to the legacy 802.15.4 protocol. My two Xbee 3 modules are talking to each other via Sparkfun Explorer adaptors when I type in XTCU console log. I set the Xbee 3 baud rate as the F9P’s, namely 115200. Other than change the PAN ID, I made no other changes to the XBee 3 default settings.

My multimeter indicates about 3.3V at the F9P UART2 TX pin which outputs the RTCM messages. However when I connect this output to the Xbee 3 DIN pin, there is no data appearing on the XCTU console log. Could you please help me set up this wireless link between the pair of F9P receivers.

2

RicDG,

Which port are you connecting to? From what I can find about this, the F9P main port is SPI and not serial.

Digi Support

3

I connected to the F9P port recommended by https://learn.sparkfun.com/tutorials/gps-rtk2-hookup-guide which states:“There is a second serial port (UART2) available on the ZED-F9P that is primarily used for RTCM3 correction data.” I had also used this port for my successful wired connection between F9P’s.
Page 17 of Ublox’s F9P Moving Application Note says:“Set the base ZED-F9P UART2 to output the required RTCM messages”

4

The fact that you are not getting any data leads me to thinking that there is a wiring issue. If it was a baud rate issue, you would still get data. Just would be in a way that it was not readable. No data means that either the cables are backwards, voltage issue or something of that nature.