ATOM DTU NB CN

SKU:K060

Description

ATOM DTU NB CN is a programmable data transmission unit (DTU) with integrated NB-IoT communication function. The built-in SIM7020C module covers most of the Cat-NB frequency bands and integrates the SMA external antenna interface to improve the communication quality and signal stability of the device. Unlike the DTU, which generally only has the function of data transparent transmission, the ATOM DTU series adopts a more open architecture design. The controller ATOM LITE can modify the program at will according to the actual business, and the whole machine reserves a variety of interfaces (RS485, I2C, custom interfaces) for user expansion, which is convenient for the rapid access of sensors and actuators. The self-contained guide rail clamping structure is perfectly embedded in various industrial control sites. ATOM DTU NB CN is very suitable for various low-latency, low-throughput application scenarios (such as remote control, asset tracking, remote monitoring, remote medical treatment, shared bicycles, etc.).

Product Features

• SIM7020C/Applicable to China

• RS485 communication interface (with 12V input interface, internal integrated DCDC step-down 5V)

• Modbus Master/slave

• Strong signal access capability

• AT command control

• SIM card type: MicroSIM

• External antenna: SMA antenna interface

• Grove expansion interface:

  • I2C x1
  • Custom x1

• Serial communication: UART 115200bps

• Self-contained rail clamping

• Cat-NB frequency band:

  • B1/B3/B5/B8

• Data transmission (kbps):

  • 26.15(DL)/62.5(UL)

• Network protocol:

  • TCP/UDP/LWM2M/COAP/ MQTT/HTTP/HTTPS/ TLS/DTLS/DNS/NTP/ PING/OneNET/Telecom Cloud/Ira Cloud*

Includes

• 1x ATOM DTU NB CN
• 1x SMA antenna
• 1x SMA red cap
• 1x M2 hexagon wrench
• 1x M2x16 screw
• 1x 3.96-4P terminal
• 1x NB-IoT flow card (mobile NB flow: 300M/year, valid time: 2021.06.16-2024.05.31)

Application

• Smart meter
• Remote monitoring
• Shared bicycles

Certification

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

Operator certification

• China Telecom/China Unicom/China Mobile

Specifications

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
Net weight	32g
Gross weight	40g
Product Size	64 * 24 * 29mm
Package Size	91 * 42 * 24.5mm

Related Link

• Datasheet
  • SIM7020 Series datasheet
  • SIM7020 Series_Ayla_Application Note_V1.03
  • SIM7020 Series_CTBURST_Application Note_V1.01
  • SIM7020 Series_CoAP_Application Note_V1.03
  • SIM7020 Series_EAT_Environment & Compilation & Burning Guide_V1.02.
  • SIM7020 Series_FOTA_Application_Note_V1.02
  • SIM7020 Series_HTTP(S)_Application Note_V1.04
  • SIM7020 Series_LWM2M_Application Note_V1.03
  • SIM7020 Series_Low Power Mode_Application Note_V1.05
  • SIM7020 Series_MQTT(S)_Application Note_V1.05
  • SIM7020 Series_NVRAM_Application Note_V1.02
  • SIM7020 Series_SAT_Application Note_V1.01
  • SIM7020 Series_SNTP_Application Note_V1.03
  • SIM7020 Series_TCPIP_Application Note_V1.04
• AT Command
  • SIM7020 Series_AT Command Manual_V1.05

Pin mapping

• SIMCOM7020C

ATOM	G22(TX)	G19(RX)	5V	GND
SIMCOM7020C	RX	TX	VIN	GND

• RS485

ATOM	G23	G33	5V	GND
RS485	TX	RX	VIN	GND

• I2C

ATOM	G25	G21	5V	GND
I2C	SDA	SCL	VIN	GND

Schematic

Example

UIFlow

Feature Introduction

• Init NB-IoT DTU Initialize NB-IoT DTU

• Power down module Power down the module

• Reset module Reset the module

• Set command echo mode Set command echo

• Check module status Check status of the module

• Check single quality Check quality of the single

• Check network registration Check the registration of the network

• Check GPRS network registration Check the registration of the GPRS network

• Enable PDP context Enable Packet Data Protocol

• CoAP connect ip port Establish CoAP connection

• CoAP GET url security Use GET to make a request

• CoAP POST url payload content format security Use POST to make a request

• CoAP PUT url payload content format security Use PUT to make a request

• CoAP destory Destroy CoAP connection

• MQTT connect server port client id username password keepalive Use the MQTT protocol to connect to the server

• MQTT disconnect Disconnect MQTT connection

• MQTT subscribe topic QoS Subscribe a topic

• MQTT subscribe callback topic msg Echo the topic and content of the subscription

• MQTT unsubscribe topic Unsubscribe the topic

• MQTT publish topic payload Qos Publish a topic

• MQTT check connection Check MQTT connection

• MQTT poll downlink message Poll downlink message

• RS485 write a line Write a line of data

• RS485 write Data input

• RS485 write raw data create list with Write raw data in list form

• RS485 read all Read all data of RS485

• RS485 read characters Read the number of characters of RS485

• RS485 read line Read the data of a line of RS485

• Remain cache Remian cache of RS485

• Read coils slave address starting address coil qty Read the data of the coils

• Read discrete inputs slave address starting address input qty Read the data of the discrete inputs

• Read holding registers slave address starting address register qty signed Read the data of the holding registers

• Read input registers slave address starting address register qty signed Read the data of the input registers

• Write single coil slave address output address output value Write data to a single coil

• Write single register slave address register address register value signed Write data to a single register

• Write multiple coils slave address starting address output value Write data to multiple coils

• Write multiple register slave address starting address register value signed Write datat to multiple register

Usage

• Download the ATOM DTU NB M5F program file

Arduino

• ATOM DTU NB - MQTT
• ATOM DTU NB - HTTP

Video