EasyLoader (beta)

Current Product Don't Have Test Firmware

Note: pls, use PC chrome/edge browser, if can't connect, refresh the webpage.

1. Click connect button

2. After connected successfully, pick a firmware

3. Click the burn button

4. After burning successfully, Unplug the device and restart.





COM.NB-IoT CN is a NB-IoT wireless communication module that matches the China region Cat-NB frequency band. Built-in SIM7020C communication module, adopts serial communication (AT command set control), and integrates SMA external antenna interface to improve the communication quality and signal stability of the device. The SIM7020C module is the best for applications with low latency, low throughput. The excellent solution is very suitable for IoT applications such as metering, remote control, asset tracking, remote monitoring, telemedicine, and shared bicycles.


When used with the FIRE main control, due to the PSRAM pin conflict, please switch the DIP switch pins of the module base to TX(0/13), RX(5/15), and the device can use USB/ External DC is used for power supply.

When used with Core2 series main control, due to the different order of the base pin array, COM.X base pins TX(16), RX(17) correspond to the actual pins TX(14), RX of the Core2 main control (13) The equipment needs to use external DC for power supply.

Note: When using the CORE2 or CORE2-FOR-AWS main control to drive the module, please use the DC power input of the base and set the power mode to input mode (refer to the code below), otherwise it will not start normally

//kMBusModeOutput: Use USB or battery power
//kMBusModeInput: Use external power supply 5V, or DC interface

M5.begin(true, true, true, false, kMBusModeInput);

//Initialize Serial according to the actual connected pins
Serial2.begin(115200, SERIAL_8N1, 13, 14);

The module base has a DC power input interface. Please strictly follow the input range (5-12V) to prevent damage to the module when using this interface to connect to the power supply. The internal power DIP switch can adjust the voltage level of the internal terminal VIN to adapt to different modules.

Product Features

  • Applicable to China

  • Stackable design

  • Strong signal access capability

  • Independent external power supply

  • AT command control

  • SIM card type: Nano

  • External antenna: SMA antenna

  • Serial communication: UART 115200bps

  • Cat-NB frequency band:

    • B1/B3/B5/B8
  • Data transmission (kbps):

    • 26.15(DL)/62.5(UL)
  • Network protocol:



  • 1x COM.NB-IoT CN Module
  • 1x SMA antenna


  • Smart meter
  • Remote monitoring
  • Shared bicycles


  • RoHS/REACH/CCC/CTA/SRRC/Mobile/Unicom/Telecom/ATEX

Operator certification

  • China Telecom/China Unicom/China Mobile


Resources Parameter
Module SIM7020C
Support Cat-NB frequency band B1/B3/B5/B8
Network protocol TCP/UDP/LWM2M/COAP/ MQTT/HTTP/HTTPS/ TLS/DTLS/DNS/NTP/ PING/OneNET/Telecom Cloud/Aila Cloud*
communication UART 115200bps
DC interface specifications 5.5mm
Net weight 40g
Gross weight 75g
Product Size 54*54*13.2mm
Package Size 165*60*36mm

Some national carrier frequency bands

The following content is for reference only.

North AmericaB4 (1700), B12 (700), B66 (1700), B71 (600), B26 (850)
Asia PacificB1(2100), B3(1800), B5(850), B8(900), B18(850), B20(800), B26(850),B28(700)
Europe: B3 (1800), B8 (900) , B20 (800)
Latin AmericaB2(1900), B3(1800), B5(850), B28(700)
Commonwealth of Independent StatesB3 (1800), B8 (900), B20 (800)
Sub-Saharan AfricaB3(1800), B8(900)
Middle East, North AfricaB8(900), B20(800)


Pin mapping





Arduino code example