Initial setting for LTE modules

To use the newly purchased LTE module in your Gaduino blocks, you must follow the steps below.

This process is to adjust the baudrate at which the LTE module communicates.

Material

USB to TTL (CP2102)

LTE Modules

Dupont cable (F to F)

Don't need to buy it. It is typically included with CP2102.

Method

Circuit Connection

Connect as follows:

CP2102 (TXD) - LTE Module (R, RX, or RXD)
CP2102 (RXD) - LTE Module (T, TX, or TXD)
CP2102 (+5V) - LTE Module (V or VIN)
CP2102 (GND) - LTE Module (G or GND)

※ Sometimes there are two same PINs in the module. Both of them can be used.

Check the COM port of CP2102

Right-click the window icon on the taskbar.
Select [Device Manager] from the menu.
Under [Ports (COM&LPT)], remember the COM Port number written next to the "Silicon Labs CP210x USB to UART Bridge" entry.

4. Open the serial monitor. Select the COM port you remembered from earlier, and select 115200 for Baud (because the module you bought is set to 115200 bps).

4. Open the Arduino IDE 2.1.1 (or upper version). Click [Tools] - [Port] in the menu. Select the COM port you remembered from earlier.

and select 115200 for Baud (because the module you bought is set to 115200 bps).

4. Click the magnifying glass button in the upper right.

5. Select 115200 for Baud in the lower right (because the module you bought is set to 115200 bps).

5. Type AT in the text box and press [Enter]. If OK appears, communicating with the LTE module is fine.

5. Type AT+IPREX=9600 or AT+IPR=9600 (depending on the model of the LTE module)in the window below and press [Enter]. If OK appears, the baud rate of your LTE module is changed to 9600bps.

SIM7000, SIM7070, SIM7080: AT+IPR=9600
SIM7600, A7600, A7670: AT+IPREX=9600

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