Our wireless data terminal DTU is an industrial 4G full Netcom product, it fully supports China Mobile, China Unicom and China Telecom 2G/3G/4G network, can realize the wireless data communication between the field serial device and the central control system, with rapid networking, flexible expansion, short construction cycle, low cost advantages. The encryption chip and data encryption and decryption algorithm and protocol adopted by this DTU are fully in line with the security specifications and requirements of the State Grid Corporation, and can easily complete the remote data collection and control of on-site equipment, which is widely used in water conservancy, sewage treatment, new energy, municipal water supply and heating gas, transportation, electric power, environmental protection, meteorology and other industries.