Different transmission methods: DTU usually uses wireless or wired methods to transmit data, FTU transmits data through digital communication, TTU mainly uses dedicated transmission lines or wireless methods to transmit data, and RTU uses digital communication or. Different transmission methods: DTU usually uses wireless or wired methods to transmit data, FTU transmits data through digital communication, TTU mainly uses dedicated transmission lines or wireless methods to transmit data, and RTU uses digital communication or. DTU stands for Database Transaction Unit (also called serial server, IP Modem and industrial IoT terminal device), which can be used as a gateway in some application scenarios. The difference between DTU and wireless modem is that wireless modem is a physical tunnel to access network. It does not. Industrial DTU Data Transfer U nit data transmission unit, also known as "data transmission unit, concentrator, converter, transponder", etc., usually routers, gateways, support a variety of industrial protocols such as mqttiec101modbus and other protocol wired input, Then use wired or wireless. DTU, Data Terminal Unit, is a device for data communication between field equipment and superior equipment. Typically, it is employed to send data to a central monitoring system from distant equipment.