User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R18 Advance Information System description
Page 56 of 206
1.9.2 Auxiliary asynchronous serial interface (AUX UART)
The auxiliary UART interface is not available on SARA-U2 series modules.
The auxiliary UART interface is a 3-wire 1.8 V unbalanced asynchronous serial interface (only the RXD_AUX data
output and the TXD_AUX data input are provided) available on all SARA-G3 modules, supporting:
x AT command mode
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x GNSS tunneling mode
x FW upgrades by means of the u-blox EasyFlash tool (see the Firmware update application note [28])
x Trace log capture (diagnostic purpose)
SARA-G3 modules product versions “00” and “01” do not support the AT command mode and the GNSS
tunneling mode over the Auxiliary UART interface.
SARA-G3 modules do not support the Data mode and Online command mode
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over the Auxiliary UART
interface.
SARA-G3 modules’ auxiliary UART interface is by default configured for trace log capture (diagnostic purpose).
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, 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 diagnostic 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 diagnostic 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
The serial interface configuration cannot be changed on the “00” and “01” product versions of the
SARA-G3 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.
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See the u-blox AT Commands Manual [3] for the definition of the command mode, data mode, and online command mode.