This 4G DTU is an IoT wireless communication device that transparently transmits data from serial ports or other interface devices to remote servers via 4G networks, enabling remote data collection and device control. It features stable network connectivity, wide coverage, and easy deployment. Innovatively, this DTU integrates a 4G module with a security chip. By leveraging the security chip's protective features, data conversion and transmission become more secure and reliable. It is suitable for various applications such as smart factories, smart grids, smart cities, intelligent transportation, and remote medical equipment. It effectively addresses networking and communication challenges for devices in remote or mobile scenarios, serving as a key component for device intelligence and remote operation and maintenance.

· Field Layer: Frequency Converter + 4G DTU. The frequency converter is connected to the 4G DTU via an RS485/TTL communication interface.

· Network Layer: The carrier's 4G network, providing a wireless data transmission channel.

· Platform Layer: A cloud platform located on the internet, responsible for receiving, storing, parsing, and displaying data.

A frequency converter customer in a central provincial capital city added a 4G DTU module to their existing frequency converters, thereby enabling remote operation and maintenance, which reduced maintenance costs and enhanced system reliability and security.

The DTU equips the frequency converters with "wireless wings," connecting individual, isolated "information silos" into a unified and intelligent IoT system. This application effectively addresses common industrial pain points such as scattered device distribution, difficult wiring, and high maintenance costs. It serves as a classic and efficient solution for achieving remote operation, maintenance, and management of equipment in fields like Industrial Internet and Smart Manufacturing.