Ublox SARA-R422 User Manual

SARA-R4 series - System integration manual
UBX-16029218 - R20 System description Page 37 of 128
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1.9.1.3 UART multiplexer protocol
SARA-R4 series modules include multiplexer functionality as per 3GPP TS 27.010 [10], on the primary
main UART physical link. This is a data link protocol which uses HDLC-like framing and operates
between the module (DCE) and the application processor (DTE) and allows a number of simultaneous
sessions over the primary main UART physical link. The following virtual channels are defined:
• Channel 0:
for Multiplexer control
• Channel 1:
for all AT commands, and non-Dial Up Network (non-DUN) data connections. UDP,
TCP data socket / data call connections via relevant AT commands.
• Channel 2:
for Dial Up Network (DUN) data connection. It requires the host to have and use its
own TCP/IP stack. The DUN can be initiated on modem side or terminal/host side.
• Channel 3:
for u-blox GNSS data tunneling (not supported by SARA-R410M-01B product version
and SARA-R422 product versions).
1.9.2 USB interface
1.9.2.1 USB features
SARA-R4 series modules include a high-speed USB 2.0 compliant interface with a maximum 480 Mb/s
data rate according to the USB 2.0 specification [6]. The module itself acts as a USB device and can
be connected to any USB host equipped with compatible drivers.
The USB is the most suitable interface for transferring high speed data between the SARA-R410M
and SARA-R412M modules and an external host processor, available for AT / data communication,
FW upgrade by means of the FOAT feature.
The USB is the interface of SARA-R4 series modules available for FW upgrade by means of the u-blox
dedicated tool and for diagnostic purposes.
SARA-R410M and SARA-R412M modules provide the following USB lines:
• the USB_D+ / USB_D- lines, carrying the USB data and signaling
• the VUSB_DET input pin to enable the USB interface by applying an external voltage (5.0 V typical)
SARA-R422, SARA-R422S and SARA-R422M8S modules provide the following USB lines:
• the USB_D+ / USB_D- lines, carrying the USB data and signaling
• the USB_5V0 input pin to enable the USB interface by applying an external 5.0 V typical voltage
• the USB_3V3 input pin to supply the USB interface by applying an external 3.3 V typical voltage
• the RSVD #33 pin to be externally accessible to enable FW upgrade over the USB interface
☞ The USB interface is available as an AT / data communication interface on the SARA-R410M and
SARA-R412M modules only if an external valid USB VBUS voltage (5.0 V typical) is applied at the
VUSB_DET input of the module since the switch-on of the module, and then held during normal
operations. In this case, the UART will not be available.
☞ AT command / data communication are not supported over USB on SARA-R422, SARA-R422S and
SARA-R422M8S modules: the USB interface is available on these modules product versions for
FW upgrade by means of the u-blox dedicated tool and for diagnostic purposes only.
☞ If the USB interface is enabled, the module does not enter the low power deep sleep mode: the
external voltage needs to be removed from the VUSB_DET / USB_5V0 and USB_3V3 input pins of
the module to let it enter the Power Saving Mode defined in 3GPP Rel.13.
☞ It is highly recommended to provide accessible test points directly connected to the V_INT,
PWR_ON / PWR_CTRL, VUSB_DET / USB_5V0, USB_3V3, USB_D+, USB_D-, RSVD #33 pins for
FW upgrade and/or for diagnostic purpose.

Ublox SARA-R422 Specifications

General

Brand	Ublox
Model	SARA-R422
Category	Control Unit
Language	English