LPM2100 mg NB Module Hardware User Guide
Shanghai Yuge Information Technology Co., Ltd.
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Figure 3-9 Reset timing diagram
The LPM2100 mg series module supports AT command reset, and the AT command is
AT+TRB to restart the module. Detailed instructions can be found in the "RDA_AT
Command Manual" provided by the domain.
3.6 UART interface
The LPM2100 mg series modules provide three sets of UART interfaces. Main serial
port, debug serial port, auxiliary serial port. The serial port level is the IO output level value.
The module is a DCE (Data Communication Equipment) device.
The main serial port can realize AT interactive instructions and peripheral data
interaction.
Debug the serial port to upgrade the firmware, view log information, and so on.
The module serial port baud rate can be set to 4800, 9600, 19200, 38400, 57600, 115200,
230400, 460800, 921600bps baud rate, the default is 57600bps.
Table 3-5 Serial port pin definitions
Pin
Pin name
IO
Functional description
Remarks
Main serial interface
17
RXD
DI
Master data reception
IO voltage domain
18
TXD
DO
Master data transmission
IO voltage domain
Debug serial interface
38
RXD_DBG
DI
Module debug data
reception
Debug serial port
39
TXD_DBG
DO
Module debug data
transmission
Debug serial port
Secondary serial interface
