EVK-M8U User Guide
UBX-15023994 - R01
Advance Information
Setting up
Page 12 of 26
4.1.3
Connecting the cables
Unless using USB alone, we recommend using the ACE-AM-0 mating connector (available from the u-blox
webshop) because it locks securely to the front test connector. You will need to solder the necessary I/O cables
to signal sources and outputs as specified in Table 5.
1.
Connect the finalized cable to the front connector of EVK-M8U.
2.
Connect the unit to a PC running Microsoft Windows by
a.
USB: Connect via USB port or
b.
UART: Connect via RS232. Set slide switch to I2C or
c.
SPI / I
2
C compliant DDC: Connect corresponding pins (see Table 4 for pin description). Set slide
switch accordingly to SPI or I
2
C.
3.
Press the RST button after changing the SPI/ I
2
C switch.
4.
The device may be powered either via USB or from a 5 V supply via the V5_IN input on the front.
5.
Connect the RF cable of the GNSS antenna to the RF_IN connector.
6.
Start the u-center GNSS Evaluation Software and select corresponding COM port and baud rate.
7.
Refer to the
u-center User Guide
[4] for more information.
4.2
Recommended configuration
For an optimum navigation performance, the recommended configuration is as follows:
Navigation Rate: The default DR/GNSS-fused navigation solution update rate of 1 Hz is recommended.
You can set the navigation update rate with the message UBX-CFG-RATE. (In this mode navigation rates
up to 20Hz are also available from the UBX-HNR-PVT message.)
4.2.1
Serial port default configuration
Parameter
Description
Remark
UART Port 1, Input
UBX and NMEA protocol at 9,600 Bd
UART Port 1, Output
UBX and NMEA protocol at 9,600 Bd
Only NMEA messages are activated
USB, Input
UBX and NMEA protocol
USB, Output
UBX and NMEA protocol
Only NMEA messages are activated
Table 5: Default configuration
4.2.2
UDR receiver operation
By default, EVK-M8U is ready to operate in UDR navigation mode.
The statuses of different modes of UDR receiver are output in the UBX-ESF-STATUS message.
4.2.2.1
Initialization mode
The purpose of Initialization phase is to estimate all unknown parameters which are required for achieving
fusion. In this case the required sensor calibration status shows NOT CALIBRATED (see Figure 4). Note that
initialization phase requires good GNSS signals conditions as well as periods during which vehicle is stationary
and moving (including turns). Once all required initialization steps are achieved fusion mode is triggered and
calibration phase begins.
