SARA-R4/N4 series-AT Commands Manual
UBX-17003787 - R09
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16File System
Page 171 of 307
16î™–î™–î™–î™–File System
16.1î™–î™–î™–î™–File tags
16.1.1î™–î™–î™–î™–Description
File system commands have the optional <tag> parameter that allows you to specify a file type when an AT
command is issued, to inform the system what to do with it. Application specific files must be saved with the
correct type tag, otherwise they are treated as common user files.
Table 17 defines the tags and their specific meanings while Table 18 defines their applicability to module series:
Tag Name Specification
"USER" User file system This is the default type if the <tag> parameter is omitted in file system AT
commands. All generic files can be stored in this manner.
Example: AT+UDWNFILE="foobar",25,"USER" is the same as AT
+UDWNFILE="foobar",25
"FOAT" FOAT file system This tag is used to specify the file type as a firmware update package. It will
place the firmware update package in the proper file cache to be used later by
the +UFWINSTALL command.
"AUDIO" Audio parameters This tag is used to store audio calibration file "audio_gain_calibration<X>.xml"
and "voice<X>.nvm" in the selected profile <X>=0,1. The profile is stored into
NVM by using ATZ<X>.
The "audio_gain_calibration<X>.xml" and "voice<X>.nvm" files can be over-
written with AT&W<X> command.
"FOTA_EXT" Firmware for FOTA
procedure
This tag has to be used to store the firmware file for the FOTA procedure using
a dedicated channel of the USB CDC-ACM interface.
"AUDIO_EXT" Audio configuration
and custom eCall
prompts
This tag is used to read or download audio configuration (see Audio parameters
tuning section) or download and delete custom eCall prompts (see eCall
Prompts section) using a dedicated channel of the USB CDC-ACM interface.
The audio configuration file includes the NVM settings of the following AT
commands (where applicable):
• +CLVL AT command
• +CRSL AT command
• +UI2S AT command
• +UMAFE AT command
• +USAFE AT command
• +UMSEL AT command
• +UMGC AT command
• +USGC AT command
• +USPM AT command
• +UTI AT command
To download the audio configuration or custom eCall prompts in the module,
use the +UDWNFILE command.
To read configuration from the module, use the +URDFILE command.
To delete custom eCall prompts from the module, use the +UDELFILE
command.
"PROFILE" Profile files This tag refers to the profile files that can be loaded on to the module to
support Mobile Network Operators (MNOs) specific configurations. For more
details on the profiles, see the +UMNOPROF command. The +URDFILE and
+ULSTFILE AT commands are not allowed with this tag, the user can only
download or delete these files.
"GNSS" GNSS files This tag has to be used to store the firmware file for the internal GNSS receiver.
Table 17: Tag meanings
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