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Atom DTU NB IoT2

SKU:K059-B

Description

ATOM DTU NB2 is a programmable wireless data transmission unit (DTU) suitable for global Cat-NB bands, specifically designed for NB-IoT applications. It features an integrated SIM7028 communication module and utilizes serial communication (controlled via AT command set). The unit includes an SMA external antenna interface, significantly enhancing communication quality and signal stability. The SIM7028 module supports most Cat-NB bands, ensuring broad applicability worldwide. Unlike typical DTUs that only provide data transmission functionality, the ATOM DTU series adopts a more open architecture. The controller, ATOMS3 LITE, allows for program modifications based on actual business needs. The unit reserves various interfaces (RS485, I2C, custom interfaces) for user expansion, facilitating quick integration of sensors and actuators. It also comes with a rail mounting structure, making it ideal for embedding in various industrial control environments. ATOM DTU NB2 is perfect for low-latency, low-throughput application scenarios such as remote control, asset tracking, remote monitoring, telemedicine, and shared bicycles.

Product Features

  • Adapt AtomS3/AtomS3 Lite/Atom matrix/Atom Lite
  • Global version/multi-band support
  • Strong signal access capability
  • AT command control
  • SIM card type: Nano
  • External antenna: SMA antenna
  • Serial communication: UART 115200bps
  • Data transmission (kbps): 127(DL)/159(UL)
  • Supports multiple network protocols
  • Multiple certifications including radio, environmental, and carrier standards
  • Multiple power supply options

Package Includes

  • 1x ATOM DTU2-NB-IOT2 Base
  • 1x AtomS3 Lite
  • 1x Stick Antenna (2.5dBi total length 110mm SMA inner needle)
  • 1x SMA Antenna Red Cap
  • 1x M2 Hex Wrench
  • 1x M2x16 Screw
  • 1x HT3.96-4P Terminal

Applications

  • Asset tracking
  • Remote monitoring/control
  • Shared bicycles

Certifications

Radio and Communication Equipment Certifications

  • SRRC, NAL, CE-RED, GCF, CCC

Safety and Environmental Certifications

  • CCC, RoHS, REACH

Carrier Certifications

  • Deutsche Telekom, Vodafone, Telefonica, China Telecom, China Mobile, China Unicom

Specifications

Specification Parameter
Communication Module SIM7028
Supported Cat-NB Bands B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B26/B28/B66/B70/B85
Network Protocols TCP/UDP/HTTP/TLS*/DTLS*/DNS/NTP/PING/LWM2M/COAP*/MQTT/MQTTS/SSL
Carrier Certifications Deutsche Telekom/Vodafone/Telefonica/China Telecom/China Mobile/China Unicom
Communication Method UART 115200bps
Antenna Stick Antenna @2.5dBi total length 110mm SMA inner needle
Power Supply Methods RS485 Port (HT396 Interface 9-24V)
USB 5V
Grove Interface Load Capacity DC5V/0.9A
Operating Temperature 0-40°C
Product Dimensions 65.3*28.7*24mm
Package Dimensions 168*117*19.7mm
Product Weight 24.6g
Package Weight 38.7g

AT Command

Schematic

schematics

PinMap

ATOM DTU-NB-IoT2 RS485_TX RS485_RX SIM7028_TX SIM7028_RX SDA SCL
ATOM Lite/ATOM Matrix G23 G33 G19 G22 G25 G21
ATOMS3/ATOMS3 Lite G7 G8 G6 G5 G38 G39

Product Test Data

RS485 Communication Test (Test conditions: 120Ω terminal resistance added)

Communication Distance Data Rate
5m Maximum data rate 750Kbps, normal reception and transmission, packet loss rate 0%, error rate 0%
20m Maximum data rate 750Kbps, normal reception and transmission, packet loss rate 0%, error rate 0%
50m Maximum data rate 750Kbps, normal reception and transmission, packet loss rate 0%, error rate 2%
100m Maximum data rate 512Kbps, normal reception and transmission, packet loss rate 0%, error rate 0%

Antenna VSWR

Stick Antenna VSWR
90° 1.104dB
180° 1.279dB

Power Consumption Test

Parameter Category Specification
Standby Current (with ATOM Lite host) DC9V@36.00mA
DC12V@28.95mA
DC24V@17.00mA
Operating Current (with ATOM Lite host) DC24V@17.00mA
DC12V@48.52mA
DC24V@25.00mA

Module Size

module size

Examples

Arduino

? > Programming attention |PIO user: Download the library dependency version specified in the 'platformio.ini' file
Arduino: Download the above library file and manually install it in the specified Arduino library folder.

  • PlatformIO adds library file dependencies as follows:
lib_deps = 
    m5stack/M5Unified@^0.1.13
    m5stack/M5AtomS3@^1.0.0
    fastled/FastLED@^3.6.0
    knolleary/PubSubClient@^2.8
    vshymanskyy/StreamDebugger@^1.0.1
    https://github.com/m5stack/TinyGSM/archive/refs/tags/v0.12.0-patch-1.zip
    arduino-libraries/ArduinoHttpClient@^0.6.0
    bakercp/CRC32@^2.0.0
  • The Arduino installation library file is shown in the following figure:
module size

Version Comparison

Product SKU Module Cat-NB Bands Data Transmission Rate Communication Protocols
Atom DTU-NB-IoT K059 SIM7020G B1/B2/B3/B4/B5/B8/B12/
B13/B17/B18/B19/B20/B25/B26
/B28/B66/B70/B71/B85
126 (DL) / 150 (UL) TCP/UDP/HTTP/HTTPS/TLS*/
DTLS*/DNS/NTP/PING/LWM2M/
COAP*/MQTT/MQTTS/SSL
Atom DTU-NB-IoT2 K059-B SIM7028 B1/B2/B3/B4/B5/B8/B12/
B13/B14/B17/B18/B19/B20/B25/
B26/B28/B66/B70/B85
127 (DL) / 159 (UL) TCP/UDP/HTTP/HTTPS/TLS*/
DTLS*/DNS/NTP/PING/LWM2M/
COAP*/MQTT/MQTTS/SSL
Difference Overview
The main differences between SIM7028 and SIM7020G lie in band support and data transmission rate. The SIM7028 supports more bands and slightly higher data transmission rates, making it suitable for more markets and higher bandwidth requirements. The SIM7020G, although supporting fewer bands, still covers most markets and is suitable for general IoT applications. Both have similar network protocols and features, along with extensive international and carrier certifications.

Video