Narrowband Internet of Things (NB-IoT) technology is widely used in agriculture, industry, government and life. So what is the architecture diagram of Narrowband Internet of Things (NB-IoT) technology? A typical NB-IoT architecture has three layers, which are Perception layer, network layer, application layer.

Industrial intelligent gateway is suitable for water, gas and steam pipe network monitoring; EMS (energy management system) signal collection and transmission; municipal water supply and drainage pipe network, pipe trench monitoring; underground pipe gallery environmental monitoring. Signal acquisition and data transmission in the production process of manufacturing and processing enterprises;

DTU is a wireless data transmission terminal, which is the most basic wireless transparent transmission terminal device.The data transfer unit DTU (Data Transfer Unit) is a wireless terminal device specially used to convert serial port data into IP data or convert IP data into serial port data for transmission through a wireless communication network.

The main function of DTU is to transmit data from remote devices back to the back-end center via wired/wireless methods. DTU data transmission methods are different. DTU has full Netcom DTU, GPRS DTU, WIFI DTU, CAN DTU, 4G DTU. Today we will take a look at the structure and work flow of DTU.

The rapid development of the Internet of Things puts forward higher requirements for wireless communication technology, and LPWAN, which is designed for low-bandwidth, low-power, long-distance, and massively connected IoT applications, is also rapidly emerging. LPWAN (low-powerWide-AreaNetwork, low-power wide area network), that is, wide area network communication technology. NB-IoT and LoRa have ···

Examples of LoRa applicable scenarios: Smart meter reading: The owner has high requirements for the collection frequency and needs to do data analysis, and has high requirements for network availability;

LoRa is a low-power long-distance wireless communication technology, mainly for applications such as the Internet of Things or M2M, and is an important wireless technology for low-power wide area networks (LPWAN).

RS-485/Modbus is a popular way of network layout, which is characterized by simple and convenient implementation. The RS485 conversion interface is relatively cheap and has a wide variety of types.

IoT gateways will also become an important link for connectivity. As a gateway device, in addition to being responsible for the protocol conversion between different types of perception networks, the IoT gateway can integrate the information collected by different things and transmit it to the next level, so that the information can be Transmission between the various parts. The IoT gateway can re···

The Modbus protocol includes ASCII, RTU, TCP, etc., and does not specify the physical layer. This protocol defines the message structure that the controller can recognize and use, regardless of what kind of network they communicate through. The standard Modicon controller uses RS232C to implement serial Modbus.