Prime Edition MkIII. GNSS troubleshooting

The 'GNSS Access' firmware utility gives an opportunity to establish a communication session to a built-in GNSS module as if it was directly connected to a PC. This approach opens an access to the GNSS module by the genuine software provided by manufacturer for diagnostic and configuration purpose.

There following SoftRF Editions are supported by the 'GNSS Access' firmware:

• Prime Mark III
• Ham
• Midi

The 'GNSS Access' firmware:

1. provides USB VCOM port for a PC ;
2. provides a proper UART connection to the built-in U-blox, Quectel or UniCore GNSS module ;
3. forwards serial data from the GNSS to USB and back ;
4. keeps UART baud rate setting in sync with USB VCOM baud rate setting.

Default settings

Factory default baud rate setting:

Model	GNSS	bps
Prime 3	U-blox M10S	9600
Prime 3 or Ham	Quectel L76K	9600
Midi	UniCore UC6580	115200

Instructions

1. Download an appropriate version of 'GNSS Access' firmware from this location ;

2. Connect T-Beam Supreme (or Core only) to a Windows PC by means of a USB cable ;

3. Install the UF2 firmware file by 'drag-and-drop' method. Use these instructions as an example ;

4. Wait until this message will come up ;

Prime Mark III or Ham Edition

Midi Edition

5. Download an appropriate application software ;

GNSS	Application
U-blox M10S	U-Center
Quectel L76K	GnssToolKit3
UniCore UC6580	UPrecise

6. Follow the genuine manufacturer software manuals to troubleshoot your issues.

This is an illustration of session with U-blox U-Center

This is the one with GnssToolKit3 ¹

¹ - GnssToolKit3 may not enable DTR signal necessary for the T-Beam to initiate serial data output over USB. Use a known good application (like Putty or u-Center, ...) to open the COM port first , close it, then re-open the same port with GnssToolKit3 application at this time.

And this is an illustration of UPrecise session