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SARA-G450 - System integration manual

UBX-18046432 - R08 System description Page 30 of 143

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SARA-G450 modules UART interface is configured by default in AT command mode: the module waits

for AT command instructions and interprets all the characters received as commands to execute. All

the functionalities supported by SARA-G450 modules can generally be set and configured with AT

commands (see the u-blox AT commands manual [11]).

SARA-G450 modules are designed to operate as a cellular modem, representing the Data

Circuit-terminating Equipment (DCE) as per ITU-T V.24 recommendation [19]. The application

processor connected to the module through the UART interface represents the Data Terminal

Equipment (DTE).

☞ The signal names of SARA-G450 modules UART interface conform to the ITU-T V.24

recommendation [19]: e.g. the TXD line represents the data transmitted by the DTE (application

processor data line output) and received by the DCE (module data line input).

HW flow control handshakes or none flow control are supported by the UART interface and can be set

by AT commands (see u-blox AT commands manual [11], &K, +IFC AT commands).

☞ Hardware flow control is enabled by default.

SARA-G450 modules support one-shot autobauding: the baud-rate automatic detection is performed

once at module start-up, at first AT command received. After detection, the module works at the

detected baud-rate and the baud-rate can only be changed with an AT command.

The following baud-rates can be set by the AT+IPR command (see u-blox AT commands manual [11]):

 2400 bit/s

 4800 bit/s

 9600 bit/s

 19200 bit/s

 38400 bit/s

 57600 bit/s

 115200 bit/s

☞ One-shot autobauding is enabled by default.

☞ The one-shot autobauding feature works only with first AT command in capital letters (i.e. “AT”).

The following frame formats can be set by AT+ICF command (see u-blox AT commands manual [11]):

 8N1 (8 data bits, no parity, 1 stop bit), default frame configuration

 8E1 (8 data bits, even parity, 1 stop bit)

 8O1 (8 data bits, odd parity, 1 stop bit)

 8N2 (8 data bits, no parity, 2 stop bit)

☞ The automatic frame format recognition is not supported.

Ublox SARA-G450 Series User Manual

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