User Guide

u-center-User Guide
UBX-13005250 - R18

Production Information 8 Tools
Page 59 of 67
Sending a configuration to a u-blox GNSS device may fail due to a baud rate change on the current serial
port of the receiver to which the configuration is being sent. If this happens, simply change the u-center
baud rate and send the configuration again.
To write a new configuration file, click on "GNSS > File". The GNSS Configuration window closes and the progress
window pops up, showing the configurations being polled and stored into a local file in ASCII format.
If reading or writing configuration data fails too frequently, try to increase the number of retries u-center should
do on a single message if one fails.
The user can abort the transfer by clicking the “Abort” button. It's not possible to close the window unless
transfer has completed or the user aborted it.
It is not recommended to read/write configuration while the u-blox GNSS device is in sleep mode.
8.4.2 Editing configuration file
When clicking the "Edit" button in the GNSS Configuration dialog, the Notepad editor opens (standard Windows
software). Configurations are stored the following way:
• The first line contains the version of the u-blox GNSS receiver where the configuration is from. Never
change this line!
• For the second and following lines, each line contains the same: <class ID>-<message ID> -
<hexadecimal byte code of the message>. The byte code consists of class and message IDs
(2 bytes), payload length (2 bytes), payload (payload length bytes). The sync characters and the checksum
are not included. They will be calculated automatically.
Refer to u-blox Receiver Description including Protocol Specification for detailed information and ranges.
Figure 55: Content of GNSS configuration file
8.5 Preferences
The preferences tool can be used to configure a number of u-center parameters.