SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26 System description
Page 60 of 217
SARA-G3 modules’ auxiliary UART interface is by default configured for trace log capture (diagnostic purposes).
SARA-U2 modules’ auxiliary UART interface is by default configured as DDC (I
2
C) interface.
The serial interface configuration can be changed by means of the AT+USIO command to select different
alternative serial interface configuration variants, summarized in Table 12 and Table 13, available in a mutually
exclusive way (for more details, see the u-blox AT Commands Manual [3], +USIO AT command).
Digital audio and GPIO3 functionalities not available:
I2S_TXD, I2S_RXD, I2S_CLK, I2S_WA and GPIO3 pins
are configured for diagnostics as alternative function
Default configuration
Digital audio and GPIO3 functionalities are available
Digital audio and GPIO3 functionalities are available
Digital audio and GPIO3 functionalities not available:
I2S_TXD, I2S_RXD, I2S_CLK, I2S_WA and GPIO3 pins
are configured for diagnostics as alternative function
Digital audio and GPIO3 functionalities are available
Table 12: Alternative serial interface configuration variants supported by SARA-G3 modules product versions “02” onwards
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB,
Diagnostic
Default configuration
DDC (I
2
C) interface functionalities are available
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB
DDC (I
2
C) interface functionalities are available
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB
DDC (I
2
C) interface functionalities are available
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB,
Diagnostic
DDC (I
2
C) interface functionalities are available
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB,
Diagnostic
DDC (I
2
C) interface functionalities are not available:
DDC (I
2
C) interface’ pins are configured for Auxiliary
UART AT command mode, as alternative function
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB
DDC (I
2
C) interface functionalities are not available:
DDC (I
2
C) interface’ pins are configured for Auxiliary
UART Diagnostic mode, as alternative function
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB
DDC (I
2
C) interface functionalities are not available:
DDC (I
2
C) interface’ pins are configured for Auxiliary
UART AT command mode, as alternative function
Table 13: Alternative serial interface configuration variants supported by SARA-U2 modules product versions “04” onwards
The serial interface configuration cannot be changed on the “00” and “01” product versions of the
SARA-G3 series modules, and on the “00” and “x3” product versions of the SARA-U2 series modules: the
AT+USIO command is not supported.
The serial interface configuration change triggered by means of the AT+USIO command, is not performed
run-time. The settings are saved in the Non-Volatile Memory at the module power off, and the new
configuration will be effective at the subsequent module reboot.