SARA-R5 datasheet(16/43 Pages) U-BLOX

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SARA-R5 series - Data sheet

UBX-19016638 - R06

Interfaces

Page 16 of 43

C1-Public

2.5.1.1

Multiplexer protocol

SARA-R5 series modules include multiplexer functionality as per 3GPP TS 27.010 [6] on the UART

interfaces physical link. This is a data link protocol which uses HDLC-like framing and operates

between the module (DCE) and the application processor (DTE), allowing a number of simultaneous

sessions over the physical link (UART).

When USIO variant 0 or 1 is set, the following virtual channels are defined:



Channel 0: control channel



Channel 1 – 3: AT commands / data communication



Channel 4: GNSS tunneling

When USIO variant 2 is set, AT commands and data communication are available on the second

auxiliary UART, and the following virtual channels are defined on the primary UART:



Channel 0: control channel



Channel 1 – 2: AT commands / data communication



Channel 3: GNSS tunneling

When USIO variant 3 is set, diagnostic trace log is available on the second auxiliary UART, and the

following virtual channels are defined on the primary UART:



Channel 0: control channel



Channel 1 – 3: AT commands / data communication



Channel 4: GNSS tunneling

When USIO variant 4 is set, GNSS tunneling is available on the second auxiliary UART, and the

following virtual channels are defined on the primary UART:



Channel 0: control channel



Channel 1 – 3: AT commands / data communication

2.5.2 USB interface

SARA-R5 series modules include a high-speed USB 2.0 compliant interface with a maximum

480 Mbit/s data rate according to the USB 2.0 specification [9]. The module itself acts as a USB device

and can be connected to any USB host equipped with compatible drivers.

The USB interface is available for diagnostic purpose only.

The USB_D+ / USB_D- lines carry the USB data and signaling, while the VUSB_DET pin represents the

input to enable the USB interface by applying an external valid USB VBUS voltage (5.0 V typical).

☞ It is highly recommended to provide accessible test points directly connected to the USB interface

pins (VUSB_DET, USB_D+, USB_D-) for diagnostic purpose.

2.5.3 SPI interfaces

☞ The SPI interfaces are not supported by the “00” products version of SARA-R5 series modules,

except for diagnostic purpose.

SARA-R5 series modules include 1.8V Serial Peripheral Interfaces available for communications with

external SPI slave devices, or with the module acting as SPI master, for diagnostic purpose.

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