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Setup overview

1.  Download and install the u-center GNSS evalua-

tion software from www.u-blox.com/u-center. 

2.   Connect the unit to a PC. Options:
•  Connect via USB port. The USB driver installs 

automatically when the device is connected to 
the PC; internet connection is required.

•  Connect via RS232 port (UART interface). Set 

the interface switch (2) to I2C.

•  SPI / I2C: Set switch to either SPI or I2C and 

connect the appropriate pins (1).  

Note

: Press RST after setting the switch.

3.  The device must always have power, either via 

USB on the back or the V5 IN pin (3) on the front.

4.  Connect the provided GNSS antenna to the eval-

uation unit and place the antenna so that it has 
an unobstructed view to the sky. Alternatively, 
connect a GNSS simulator signal directly to the 
EVK-M91 RF input.

5.  Start the u-center GNSS evaluation software 

and select the corresponding COM port and 
baud rate.  

Quick start for EVK-M91

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UBX-19058278-R01 

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