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).
AT+USIO
UART
AUX UART
I2S and GPIO3
Remarks
0
AT, Data and MUX
AT
Diagnostic
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
1
AT, Data and MUX
Diagnostic
I2S and GPIO3
Default configuration
Digital audio and GPIO3 functionalities are available
2
AT, Data and MUX
AT
I2S and GPIO3
Digital audio and GPIO3 functionalities are available
3
AT, Data and MUX
GNSS tunneling
Diagnostic
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
4
AT, Data and MUX
GNSS tunneling
I2S and GPIO3
Digital audio and GPIO3 functionalities are available
Table 12: Alternative serial interface configuration variants supported by SARA-G3 modules product versions “02” onwards
AT+USIO
UART
AUX UART
USB
Remarks
0
AT, Data and MUX
I2C
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB,
Diagnostic
Default configuration
DDC (I
2
C) interface functionalities are available
1
Diagnostic
I2C
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB
DDC (I
2
C) interface functionalities are available
2
Diagnostic
I2C
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB
DDC (I
2
C) interface functionalities are available
3
AT, Data and MUX
I2C
AT, Data, GNSS tunneling,
SAP, Ethernet-over-USB,
Diagnostic
DDC (I
2
C) interface functionalities are available
4
AT, Data and MUX
AT
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
5
AT, Data and MUX
Diagnostic
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
6
Diagnostic
AT
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.
