u-blox ZED-F9P Interface Description - Manual
Advance Information
6.4 Configuration Interface Access
The following sections describe the existing interfaces to access the Configuration Database.
6.4.1 UBX Protocol Interface
The following UBX protocol messages are available to access the Configuration Database:
• UBX-CFG-VALGET to read Configuration Items from the database
• UBX-CFG-VALSET to set Configuration Items in the database
• UBX-CFG-VALDEL to delete Configuration Items from the database
6.5 Configuration Data
Configuration data is the binary representation of a list of Key ID and Value pairs. It is formed by concatenating
keys (U4 values) and values (variable type) without any padding. This format is used in the UBX-CFG-VALSET
and UBX-CFG-VALGET messages.
The figure below shows an example. The four Items (Key ID - Value pairs) on the left use the four fundamental
storage sizes: one byte (L, U1, I1, E1 and X1 types), 2 bytes (U2, I2, E2 and X2 types), four byte (U4, I4, E4, X4
and R4 types) and eight bytes (U8, I8, X8 and R8 types). When concatenated (right) the Key IDs and Values are
not aligned and there is no padding.
Note that this is an arbitrary example and any number of items of any value storage size can be concatenated
the same way.
6.6 Reset Behaviour
The RAM layer is always rebuilt from the layers below when the chip's processor comes out from reset. When
using UBX-CFG-RST the processor goes through a reset cycle with these reset types (resetMode field):
• 0x00 hardware reset (watchdog) immediately
• 0x01 controlled software reset
• 0x04 hardware reset (watchdog) after shutdown
6.7 Configuration Reference
See Configuration Defaults for the default values.
6.7.1 CFG-GEOFENCE: Geofencing Configuration
See the Geofencing description for feature details.
If the receiver is sent a valid new configuration, it will respond with a UBX-ACK-ACK message and immediately
change to the new configuration. Otherwise the receiver will reject the request, by issuing a UBX-ACK-NAK
and continuing operation with the previous configuration.
Note that the acknowledge message does not indicate whether the PIO configuration has been successfully
applied (pin assigned), it only indicates the successful configuration of the feature. The configured PIO must be
previously unoccupied for successful assignment.
UBX-18010854 - R04 Advance Information Page 191 of 259
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