Description M5Stack Atom DTU NBIoT2 v1.1 is a programmable NB-IoT DTU for global Cat-NB frequency bands. It integrates the SIM7028 communication module and uses UART communication through AT commands, making it suitable for low-throughput IoT data links that need wide-area cellular coverage. Compared with a conventional transparent-transmission DTU, M5Stack Atom DTU NBIoT2 v1.1 keeps a more open architecture for sensor and actuator expansion. It reserves RS485, I2C, and custom Grove interfaces, includes a DIN-rail mounting structure, and adds an M5IOE1 IO expansion chip for communication-module power enable and software reset control. The SIM7028 wireless transmission unit also adds ADC monitoring for the HT3.96-4P input power voltage, helping projects monitor power status in the field. With an external SMA antenna interface, global Cat-NB band support, MQTT/HTTP-related protocol support, and multiple power input options, the NB-IoT DTU is positioned for remote monitoring, asset tracking, remote control, shared-bicycle systems, and other industrial IoT deployments. Features M5Stack Atom DTU NBIoT2 v1.1 for global Cat-NB frequency-band use. NB-IoT DTU design based on the SIM7028 module and AT command control. M5IOE1 IO expansion chip for communication-module power enable and software reset control. ADC monitoring circuit for HT3.96-4P input power-voltage acquisition. External SMA antenna interface for stable cellular communication. Reserved RS485, I2C, and custom Grove interfaces for expansion. Micro-SIM IoT card support. Data rate of 127 kbps downlink and 159 kbps uplink. Supports network protocols including MQTT and HTTP. DIN rail mounting structure for industrial control environments. Specifications 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 References Deutsche Telekom / Vodafone / Telefonica / China Telecom / China Mobile / China Unicom Communication Method UART 115200bps @ 8N IO Expansion Chip M5IOE1 Antenna Specification 108 x 10mm, SMA connector, 850 ~ 1900 MHz operating band, 2.0 +/- 0.5 gain, VSWR
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