u-blox LEON-G100 ECALL, Руководство по системной интеграции

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LEON-G100 / LEON-G200 - System Integration Manual
GSM.G1-HW-09002-G3 Preliminary System description
Page 44 of 125
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], AT&K command): hardware flow control (RTS/CTS), software flow control
(XON/XOFF), or no flow control.
Autobauding is supported. It can be enabled or disabled by an AT command (see
u-blox AT Commands Manual
[2], AT+IPR command). Autobauding is enabled by default.
Hardware flow control is enabled by default.
For the complete list of supported AT commands and their syntax refer to the u-blox AT Commands
Manual [2].
Autobauding result can be unpredictable with spurious data if idle-mode (power-saving) is entered and
the hardware flow control is disabled.
The following baud rates can be configured using AT commands:

2400 b/s

4800 b/s

9600 b/s

19200 b/s

38400 b/s

57600 b/s

115200 b/s (default value when autobauding is disabled)
The following baud-rates are available with autobauding only:

1200 b/s

230400 b/s
Automatic frame recognition is supported: this feature is enabled in conjunction with autobauding only, which is
enabled by default. The frame format can be:

8N2 (8 data bits, No parity, 2 stop bits)

8E1 (8 data bits, even parity, 1 stop bit)

8O1 (8 data bits, odd parity, 1 stop bit)

8N1 (8 data bits, No parity, 1 stop bit)

7E1 (7 data bits, even parity, 1 stop bit)

7O1 (7 data bits, odd parity, 1 stop bit)
The default frame configuration with fixed baud rate is 8N1, described in the Figure 25.
D0 D1 D2 D3 D4 D5 D6 D7
Start of 1-Byte
transfer
Start Bit
(Always 0)
Possible Start of
next transfer
Stop Bit
(Always 1)
t
bit
= 1/(Baudrate)
Normal Transfer, 8N1
Figure 25: UART default frame format (8N1) description