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EVK-F9P-00 - User guide 

UBX-22038408 - R01 

Troubleshooting

  

Page 19 of 23 

C1- Public  

 

10

 

Troubleshooting 

My application (e.g., u-center) does not receive anything 

 

Check that the EVK is in clear sky view or that the antenna cable is connected. 

 

Check that the slide switch on the front panel of the EVK is set to the communication port that 
user is using. 

 

Check the LED is on the front panel of the EVK. A solid blue LED indicates the EVK is powered on. 
If it is not on, connect the power source either via USB on the back or through the V5_IN input on 
the front of the EVK. 

My application (e.g., u-center) does not receive all messages 

When using UART, make sure the baud rate is sufficient. If the baud rate is insufficient, GNSS 
receivers based on u-blox F9 GNSS technology

  will skip excessive messages. Some

 

serial port 

cards/adapters (i.e., USB to RS232 converter) frequently generate errors. If a communication error 
occurs while u-center receives a message, the message will be discarded. 

My application (e.g., u-center) loses the connection to the GNSS receiver 

u-blox F9 positioning technology and u-center both have an autobauding feature. If  frequent 
communication errors occur (e.g., due to problems with the serial port), the connection may be lost. 
This happens because u-center and the GNSS receiver both autonomously try to adjust the baud rate. 
Do not enable the u-center autobauding if the GNSS receiver has the autobauding flag enabled. 

The COM port does not send any messages 

Be sure that the slide switch at the front panel is set to I2C and not SPI. In the SPI mode, the RS232 
pins on the DB9 connector are switched off and the RxD and TxD output at the front panel are used 
for SPI (MISO, MOSI). 

 

CAUTION

 Changing the interface switch position while the EVK is powered on may damage the 

GNSS receiver chip. Power off the EVK before changing the interface switch setting 

Some COM ports are not shown in the port list of my application (e.g., u-center)  

Only the COM ports that are available on your computer will show up in the COM port drop-down list. 
If a COM Port is gray, another application running on the computer is using it. 

The position is off by a few dozen meters 

u-blox F9 GNSS technology starts up with the WGS84 standard GNSS datum. If your application 
expects a different datum, you will most likely find the positions to be off by a few dozen meters. Do 
not forget to check the calibration of u-center map files.  

The position is off by hundreds of meters 

Position drift may also occur when almanac navigation is enabled. The satellite orbit information 
retrieved from an almanac is much less accurate than the information retrieved from the ephemeris. 
With an almanac only solution, the position will only have an accuracy of a few kilometers, but it may 
start up faster or still navigate in areas with obscured visibility when the ephemeris from one or 
several satellites have not yet been received. The almanac information is NOT used for calculating a 
position, if valid ephemeris information is present, regardless of the setting of this flag. 

In NMEA protocol, position solutions with high deviation (e.g., due to enabling almanac navigation) 
can be filtered with the

 

Position Accuracy Mask. UBX protocol does not directly support this since it 

provides a position accuracy estimation, which allows the user to filter the position according to his 
requirements. However, the ‘Position within Limits’ flag of the UBX-NAV-STATUS message indicates 
whether the configured thresholds (i.e., P Accuracy Mask and PDOP) are exceeded. 

Содержание EVK-F9P-00

Страница 1: ...blox com EVK F9P 00 Evaluation kit User guide Abstract This document describes the structure and use of the EVK F9P 00 evaluation kit and provides information for evaluating and testing u blox F9 high...

Страница 2: ...ains the final product specification This document applies to the following products Product name Ordering code Firmware version Application version PCN reference Product status EVK F9P 00 EVK F9P 00...

Страница 3: ...g hardware 6 3 3 Default interface settings 7 4 Device description 8 4 1 Interface connection and measurement 8 4 2 Active antenna 8 4 3 Evaluation unit 8 4 3 1 Antenna connector RF IN 8 4 3 2 USB con...

Страница 4: ...2 bands ZED F9P 01B ZED F9P 02B and ZED F9P 04B Table 1 List of products supported by EVK F9P 00 evaluation kit 1 2 Kit contents The delivered package contains Compact 105 x 64 x 26 mm EVK F9P 00 eval...

Страница 5: ...perature 40 C to 65 C Table 2 EVK F9P 00 specifications 2 1 Safety precautions EVK F9P 00 must be supplied by a PS1 class limited power source See section 6 2 2 4 of IEC 62368 1 2018 5 for more inform...

Страница 6: ...he Microsoft Windows Update service The Windows system driver search mechanism will download and install the USB driver automatically from the Microsoft Windows Update service To evaluate with the Win...

Страница 7: ...t NMEA protocol is disabled by default UART2 output 38400 baud 8 bits no parity bit 1 stop bit UBX protocol is disabled by default RTCM 3 3 protocol is enabled by default but no output messages are en...

Страница 8: ...K F9P 00 evaluation unit front and rear panels 4 3 1 Antenna connector RF IN An SMA female jack is available on the front side see Figure 2 of the evaluation unit for connecting an active GNSS antenna...

Страница 9: ...Timepulse 1 output RS232 levels 7 Not connected 8 9 not connected Table 4 SUB DB9 connector pin description for EVK F9P 00 4 3 4 RST button The RST button on the front panel resets the unit CAUTION Ri...

Страница 10: ...PPP RTK fixed blinking receiving and using corrections 1 no corrections 5 SDA CS I O 3 3 V If slide switch on I2C the DDC interface is selected Function data input output If slide switch on SPI the S...

Страница 11: ...he EVK unit there is a single blue LED with the following functionality LED Description Solid blue The device is powered on with no GNSS fix Flashing blue The LED flashes one pulse per second during a...

Страница 12: ...ng mode can be reduced by downloading aiding data from the AssistNow Online service To measure the total GNSS supply current with EVK F9P 00 follow these steps 1 Place the EVK in clear sky view and pe...

Страница 13: ...r guide UBX 22038408 R01 Block diagram Page 13 of 23 C1 Public 6 Block diagram Figure 5 shows the main interfaces and internal connections of the evaluation kit for ZED F9P 00 module Figure 5 EVB F9P...

Страница 14: ...K F9P 00 User guide UBX 22038408 R01 Board layout Page 14 of 23 C1 Public 7 Board layout Figure 6 shows the EVK F9P 00 board layout See Table 6 for the component list of the EVB Figure 6 EVB F9P layou...

Страница 15: ...EED LINES TYCO 0 25PF PESD0402 140 55 125C DS1 LED OSRAM HYPER MINI TOPLED LB M673 L1N2 35 BLUE 0 02A J1 14PIN 90 2 54MM PITCH DISCONNECTABLE CRIMP CONNECTOR 40 85C J2 CON SMA SMD STRAIGHT JACK 11 4MM...

Страница 16: ...U11 U12 USB INTERFACE IC USB TO BASIC SERIAL UART 40 85C U13 USB DATA LINE PROTECTION ST USBLC6 2SC6 SOT23 6 U14 U15 TINY LOGIC ULP A 2 INPUT AND GATE 1 45X1 0 6 LEAD MICROPAK 40 85C U16 TINY LOGIC U...

Страница 17: ...EVK F9P 00 User guide UBX 22038408 R01 Schematic Page 17 of 23 C1 Public 9 Schematic Figure 7 Schematic EVK F9P 00 GNSS Antenna supervisor Supply...

Страница 18: ...EVK F9P 00 User guide UBX 22038408 R01 Schematic Page 18 of 23 C1 Public Figure 8 Schematic EVK F9P 00 Connectors...

Страница 19: ...are used for SPI MISO MOSI CAUTION Changing the interface switch position while the EVK is powered on may damage the GNSS receiver chip Power off the EVK before changing the interface switch setting S...

Страница 20: ...ox F9 GNSS technology uses a slightly different concept than most other GNSS receivers do Settings are initially stored to volatile memory In order to save them permanently sending a second command is...

Страница 21: ...sk have an impact on signal travel time The position of the GNSS receiver is typically not the same between two tests Comparative tests should therefore be conducted in parallel by using one antenna a...

Страница 22: ...Kit I2C Inter Integrated Circuit bus ESD Electrostatic Discharge Galileo European navigation satellite system GLONASS Russian navigation satellite system GND Ground GNSS Global Navigation Satellite S...

Страница 23: ...r User guide UBX 13005250 5 Information technology equipment Safety Standard IEC 62368 1 2018 For product change notifications and regular updates of u blox documentation register on our website www u...

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