[Introduction]：E90-DTU (400SL47) is a truly high-quality industrial-grade wireless data transmission radio (the radio won the national design patent ZL202030009845.3). The radio uses LORA spread spectrum technology, and its strong anti-interference ability allows wireless communications to be used in industrial sites. More stable and reliable. It has a variety of transmission methods and works in the (410.125~460.125M) frequency band. The radio station provides a transparent RS232/RS485 interface. The radio has a data encryption function. The data transmitted by the radio in the air is random. Through strict encryption and decryption algorithms, data interception is meaningless. It supports packet length setting and supports different real-time properties and data packets.