RF wireless module is a modular product of digital radio, which is a high-performance professional data transmission radio module with the help of DSP technology and radio technology. Wireless module extends to many systems, such as industrial control switch IO equipment, 485 wireless transmission equipment dw-m1, analog acquisition and control equipment. From the earliest key code, telegraph, analog radio module and wireless modem, digital radio module, DSP and software radio have been developed; the transmission signal has also changed from code, low-speed data (300-1200bps) to high-speed data (n * 64k-n * E1).

　　Its typical applications are: industrial automation, oil field data collection, railway wireless communication, coal mine safety monitoring system, pipe network monitoring, hydrological monitoring system, sewage treatment monitoring, etc.

　　Compared with the developed countries such as Europe, America and Japan, the wireless data communication technology in China started late, at least 20 years behind, but developed rapidly. The formation of the concept of wireless data transmission station in China should be in the early 1980s after the reform and opening up. However, in the whole 1980s, due to the relatively backward software and hardware technology and the relatively low level of system integration, the digital radio was only applied in a few fields, such as water conservancy, electric power, and self-contained water. Seeing the development prospect of wireless data communication, the National Radio Regulatory Commission at that time also set up a special frequency band of 223 ~ 235mhz for wireless data communication, which avoided competing for limited frequency resources with voice communication equipment such as 150MHz and 450MHz at that time. This farsighted act laid a good policy foundation for the rapid development of data transmission stations and remote control and telemetry systems in the future.

　　In the early 1990s, with the deepening of reform and opening up, the important industries of national economy, represented by electric power, water conservancy, tap water, oil, environmental protection, heat supply network, etc., have developed rapidly, and the requirements for the degree of automation are also increasing. The market of remote control and telemetry system (referred to as "three remote" system or SCADA system) in our country has gradually entered a high-speed development stage from the experimental stage. From civil to military, the application field is more and more extensive, and the demand is also growing. Digital radio has entered a period of vigorous development. The most common and typical remote control and telemetry systems are: industrial automation, oil field data acquisition, hydrological and hydrological monitoring and reporting system (i.e. basin flood control monitoring system), water pipe network monitoring system, railway signal monitoring system, heat network monitoring system, oil and gas pipeline network monitoring system, GPS positioning system, seismic monitoring and reporting system, UAV system, environmental monitoring system, etc Unification.

　　The common wireless modules in the market can be divided into three categories: ASK Superheterodyne module, which is mainly used in simple remote control and data transmission; wireless transceiver module, mainly used to control wireless receiving and sending data through MCU, generally FSK, GFSK modulation mode; wireless data transmission module, mainly used to send and receive data directly through serial port, which is easy to use.

　　According to the working frequency, the common ones on the market are 230MHz, 315MHz, 433MHz, 2.4GHz, etc