u-blox 6

5 Receiver Configuration
5.1 Configuration Concept
u-blox positioning technology is fully configurable with UBX protocol configuration messages (message class
UBX-CFG). The configuration used by the GPS receiver during normal operation is termed "Current
Configuration". The Current Configuration can be changed during normal operation by sending any
UBX-CFG-XXX message to the receiver over an I/O port. The receiver will change its Current Configuration
immediately after receiving the configuration message. The GPS receiver always uses only the Current
Configuration.
Unless the Current Configuration is made permanent by using CFG-CFG as described below, the Current
Configuration will be lost in case of (see message CFG-RST)
• a power cycle
• a hardware reset
• a (complete) controlled software reset
The Current Configuration can be made permanent (stored in a non-volatile memory) by saving it to the
"Permanent Configuration". This is done by sending a UBX-CFG-CFG message with an appropriate saveMask
(UBX-CFG-CFG/save).
The Permanent Configurations are copied to the Current Configuration after start-up or when a UBX-CFG-CFG
message with an appropriate loadMask (UBX-CFG-CFG/load) is sent to the receiver.
The Permanent Configuration can be restored to the receiver's Default Configuration by sending a
UBX-CFG-CFG message with an appropriate clearMask (UBX-CFG-CFG/clear) to the receiver.
This only replaces the Permanent Configuration, not the Current Configuration. To make the receiver operate
with the Default Configuration which was restored to the Permanent Configuration, a UBX-CFG-CFG/load
command must be sent or the receiver must be reset.
The mentioned masks (saveMask, loadMask, clearMask) are 4-byte bitfields. Every bit represents one
configuration sub-section. These sub-sections are defined in section "Organization of the Configuration
Sections"). All three masks are part of every UBX-CFG-CFG message. Save, load and clear commands can be
combined in the same message. Order of execution is clear, save, load.
The following diagram illustrates the process:
GPS.G6-SW-10018-A Public Release Page 14 of 201