u-blox LARA-R2 series System Integration Manual page 36

All the functionalities supported by LARA-R2 series modules can be set and configured by AT commands:

AT commands according to 3GPP TS 27.007 [6], 3GPP TS 27.005 [7], 3GPP TS 27.010 [8]

u-blox AT commands (for the complete list and syntax see the u-blox AT Commands Manual [2])
All flow control handshakes are supported by the UART interface and can be set by appropriate AT commands
(see u-blox AT Commands Manual [2], &K, +IFC, \Q AT commands): hardware, software, or none flow control.
Hardware flow control is enabled by default.
The one-shot autobauding is supported: the automatic baud rate detection is performed only once, at module
start up. After the detection, the module works at the detected baud rate and the baud rate can only be
changed by AT command (see u-blox AT Commands Manual [2], +IPR command).
One-shot automatic baud rate recognition (autobauding) is enabled by default.
The following baud rates can be configured by AT command (see u-blox AT Commands Manual [2], +IPR):

9600 b/s

19200 b/s

38400 b/s

57600 b/s

115200 b/s, default value when one-shot autobauding is disabled

230400 b/s

460800 b/s

921600 b/s

3000000 b/s

3250000 b/s

6000000 b/s

6500000 b/s
Baud rates higher than 460800 b/s cannot be automatically detected by LARA-R2 series modules.
The modules support the one-shot automatic frame recognition in conjunction with the one-shot autobauding.
The following frame formats can be configured by AT command (see u-blox AT Commands Manual [2], +ICF):

8N1 (8 data bits, No parity, 1 stop bit), default frame configuration with fixed baud rate, see Figure 16

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 bits)

7E1 (7 data bits, even parity, 1 stop bit)

7O1 (7 data bits, odd parity, 1 stop bit)
Normal Transfer, 8N1
Start of 1-Byte
transfer
D0 D1 D2 D3
Start Bit
(Always 0)
t
bit
Figure 16: Description of UART 8N1 frame format (8 data bits, no parity, 1 stop bit)
UBX-16010573 - R02
Possible Start of
next transfer
D4 D5 D6 D7
Stop Bit
(Always 1)
= 1/(Baudrate)
LARA-R2 series - System Integration Manual
Objective Specification System description
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