Ublox EVK-F9P-01, Руководство пользователя, Страница: 24 / 28

EVK-F9P-01 - User guide
UBX-22038408 - R03 Troubleshooting Page 24 of 28
C1- Public
11 Troubleshooting
The EVK-F9P loses RF input after a firmware update
To prevent this issue, review the configuration keys listed below and change their status to "true" if
they are not already set that way.
•
CFG-HW-ANT_CFG_VOLTCTRL
•
CFG-HW-ANT_CFG_SHORTDET
•
CFG-HW-ANT_CFG_OPENDET
•
CFG-HW-ANT_CFG_PWRDOWN
•
CFG-HW-ANT_CFG_RECOVER
see the Interface description [ 2 ] for configuration details.
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.