User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R18 Advance Information System description
Page 58 of 206
SARA-G3 modules’ auxiliary UART interface does not support the multiplexer protocol, but the interface can be
configured in GNSS tunneling mode by means of the AT+USIO command (for more details see Table 12 and the
u-blox AT Commands Manual [3]), so that:
x raw data flow to and from a u-blox GNSS receiver connected to the cellular module via I
2
C interface is
available (for more details see the u-blox AT Commands Manual [3], +UGPRF AT command)
x None flow control is supported
x Baud rate is 115200 b/s
x Frame format is 8N1 (8 data bits, No parity, 1 stop bit)
The module firmware can be updated over the auxiliary UART interface by means of:
x the u-blox EasyFlash tool
For more details on FW upgrade procedures see the Firmware update application note [28].
FOAT is not supported on the auxiliary UART interface.
1.9.3 USB interface
The USB interface is not available on SARA-G3 series modules.
1.9.3.1 USB features
SARA-U2 modules include a High-Speed USB 2.0 compliant interface with maximum data rate of 480 Mb/s
between the module and a host processor.
The module itself acts as a USB device and can be connected to any USB host such as a Personal Computer or an
embedded application microprocessor for AT commands, data communication, FW upgrade by means of the
FOAT feature, FW upgrade by means of the u-blox EasyFlash tool and for diagnostic purpose.
The USB_D+/USB_D- lines carry the USB serial bus data and signaling, while the VUSB_DET input pin senses
the VBUS USB supply presence (nominally +5 V at the source) to detect the host connection and enable the
interface.
The USB interface of the module is enabled only if a valid voltage is detected by the VUSB_DET input (see the
SARA-U2 series Data Sheet [2]). Neither the USB interface, nor the whole module is supplied by the VUSB_DET
input: the VUSB_DET senses the USB supply voltage and absorbs few microamperes.
SARA-U2 series modules can provide the following functions over the USB interface:
x CDC-ACM for AT commands and data communication
x CDC-ACM for GNSS tunneling
x CDC-ACM for diagnostic
x CDC-ACM for SAP (SIM Access Profile)
x CDC-ECM for Ethernet-over-USB
CDC-ECM for Ethernet-over-USB function is not supported by the “00” product version.