LISA-U1 series - System Integration Manual
3G.G2-HW-10002-3
Preliminary
System description
Page 45 of 125
115200 b/s
230400 b/s
460800 b/s
The default baud rate is 115200 b/s. Autobauding is not supported.
The frame format can be:
8N1 (8 data bits, No parity, 1 stop bit)
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)
The default frame configuration with fixed baud rate is 8N1, described in the Figure 21.
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 21: UART default frame format (8N1) description
1.9.2.2
UART signal behavior (AT commands interface case)
See Table 3 for a description of operating modes and states referred to in this section.
At the switch on of the module, before the initialization of the UART interface, as described in the power on
sequence reported in the Figure 17, each pin is first tri-stated and then is set to its relative internal reset state
that is reported in the pin description table in
LISA-U1 series
Data Sheet
[1]. At the end of the boot sequence,
the UART interface is initialized, the module is by default in active mode and the UART interface is enabled. The
configuration and the behavior of the UART signals after the boot sequence are described below.
For a complete description of data and command mode please refer to
u-blox AT Commands Manual
RxD signal behavior
The module data output line (
RxD
) is set by default to OFF state (high level) at UART initialization. The module
holds
RxD
in OFF state until no data is transmitted by the module.
