NB-IoT protocol is a set of wireless cellular network communication rules designed to make full use of precious wireless spectrum resources and time resources to meet the needs of LPWA. Its role is to formulate a set of syntax, semantics and timing for information interaction. In short It is the rules that stipulate what language the communication participants use, what they mean, and who speaks w···

LoRa spread spectrum principle: By using a high spreading factor, LoRa technology can transmit small-capacity data through a wide range of radio frequency spectrum. In fact, when you measure with a spectrum analyzer, the data looks like noise, but the difference is that the noise is uncorrelated, and the data is correlated. Based on this, the data can actually be extracted from the noise.

LoRa integrates digital spread spectrum, digital signal processing and forward error correction coding technology, with unprecedented performance. Previously, only those high-level industrial radio communications would integrate these technologies, and with the introduction of LoRa, the situation in the field of embedded wireless communications has undergone a complete change.

LoRa mainly operates in free frequency bands worldwide (ie unlicensed frequency bands), including 433, 868, 915 MHz, etc. LoRa network is mainly composed of four parts: terminal (built-in LoRa module), gateway (or base station), server and cloud. LoRa application data can be transmitted in both directions.

GPRS DTU adopts high-performance industrial-grade 32-bit communication processor, industrial-grade wireless module and industrial-grade GPS module. It uses embedded real-time operating system as the software support platform. It also provides RS232 and RS485 (or RS422) interfaces, which can be directly connected to the serial port. Equipment to realize data transparent transmission function

Modbus gateway is a network hub communication protocol conversion device of industrial automation system. It connects with smart meters, collects data from the lower meters to the modbus gateway, connects with the computer network, and communicates with the network computer according to the Modbus Tcp protocol.

Modbus is a standard protocol for communication between industrial equipment. It is more commonly used in instruments and meters. Different devices can communicate with each other after complying with the Modbus standard. Modbus originally used serial links, such as RS232 and RS485/422. With the development of the network, the Modbus TCP standard was later introduced. Modbus of the serial link is ···

With the help of edge computing, the intelligence of the Internet of Things can be improved, and the Internet of Things can take root in various vertical industries. So what problem does the edge solve IoT?

"Realizing the Internet of Everything" is the ultimate goal of the Internet of Things. In the 2.0 era of data processing in the Internet of Things era, growing data has given birth to the demand for edge computing. After processing, storing, and applying data on the edge close to the physical object, edge computing not only solves the problem of data transmission between devices and the cloud, but···

ARM has three authorization methods: processor, POP, and architecture authorization.