Ublox SARA-R422 User Manual

SARA-R4 series - System integration manual
UBX-16029218 - R20 System description Page 35 of 128
C1-Public
1.9 Data communication interfaces
SARA-R4 series modules provide the following serial communication interfaces:
• UART interfaces: asynchronous serial interface supporting AT commands, data communication,
GNSS tunneling, FW update by means of FOAT. See section 1.9.1.
• USB interface: High-Speed USB 2.0 compliant serial interface supporting AT commands
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, data
communication
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, FW update by means of the FOAT feature
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, FW update by means of the u-blox
EasyFlash tool and diagnostic trace logging. See section 1.9.2.
• SPI interface
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: Serial Peripheral Interface for compatible devices. See section 1.9.3.
• SDIO interface
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: Secure Digital Input Output interface for compatible device. See section 1.9.4.
• DDC interface: I2C bus compatible interface supporting communication with external u-blox GNSS
positioning chips or modules
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and with external I2C devices. See section 1.9.5.
1.9.1 UART interfaces
1.9.1.1 UART features
SARA-R4 series modules include a primary main UART interface (UART) for communication with an
application host processor, supporting AT commands, data communication, multiplexer protocol
functionality (see 1.9.1.3), FW update by means of FOAT, with settings configurable by dedicated AT
commands (for more details, see the SARA-R4 series AT commands manual [2]):
• 8-wire serial port with RS-232 functionality conforming to ITU-T V.24 recommendation [7], with
CMOS compatible signal levels (0 V for low data bit / ON state, 1.8 V for high data bit / OFF state)
o Data lines (RXD as data output, TXD as data input)
o HW flow control lines (CTS as flow control output, RTS as flow control input)
o Modem status and control lines (DTR input, DSR output, DCD output, RI output)
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• The default baud rate is 115’200 b/s
• The default frame format is 8N1 (8 data bits, no parity, 1 stop bit)
☞ The UART is available only if the USB is not enabled as AT command / data communication
interface: UART and USB cannot be concurrently used for this purpose.
☞ UART signal names of the cellular modules conform to the ITU-T V.24 recommendation [7]: e.g.
TXD line represents data transmitted by the DTE (host processor output) and received by the DCE
(module input).
☞ Hardware flow control is not supported by the SARA-R410M-01B or the SARA-R410M-02B-00
product versions. The RTS input line needs to be set low (= ON state) to communicate over the
UART on the SARA-R410M-01B product versions.
☞ DTR input of the module must be set low (= ON state) to have URCs presented over UART interface
on the SARA-R410M-01B, SARA-R410M-02B, SARA-R410M-52B and SARA-R412M-02B product
versions of SARA-R4 series modules.
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Not supported by SARA-R422-00B, SARA-R422S-00B or SARA-R422M8S-00B modules
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Not supported by the current product versions of the SARA-R410M or SARA-R412M modules. Not available on the SARA-R422,
SARA-R422S or SARA-R422M8S modules.
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Dedicated AT commands to communicate with external u-blox GNSS receiver are not supported by SARA-R410M-01B, SARA-R422,
or SARA-R422M8S product versions
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DTR, DSR, DCD and RI pins can be alternatively configured, in mutually exclusive way, as secondary auxiliary UART interface (UART
AUX) on SARA-R422, SARA-R422S and SARA-R422M8S modules.

Ublox SARA-R422 Specifications

General

Brand	Ublox
Model	SARA-R422
Category	Control Unit
Language	English