u-blox LARA-R203 System Integration Manual page 39

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 an AT command (see the 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):

9,600 bit/s

19,200 bit/s

38,400 bit/s

57,600 bit/s

115,200 bit/s, default value when one-shot autobauding is disabled

230,400 bit/s

460,800 bit/s

921,600 bit/s

3,000,000 bit/s

3,250,000 bit/s

6,000,000 bit/s

6,500,000 bit/s
Baud rates higher than 460,800 bit/s cannot be automatically detected by LARA-R2 series modules.
The modules support one-shot automatic frame recognition in conjunction with one-shot autobauding. The
following frame formats can be configured by an AT command (see the u-blox AT Commands Manual [2], +ICF):

8N1 (8 data bits, no parity, 1 stop bit), default frame configuration with a fixed baud rate, see Figure 18

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 18: Description of the UART 8N1 frame format (8 data bits, no parity, 1 stop bit)
UBX-16010573 - R12
Possible Start of
next transfer
D4 D5 D6 D7
Stop Bit
(Always 1)
= 1/(Baudrate)
LARA-R2 series - System Integration Manual
System description
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