The application of digital radio in the field of industrial control has been very extensive, and it is still the main transmission means in the field of industrial control. With factors such as wide coverage of GPRS and other networks, high reliability of data transmission, convenient networking, and low cost, the data transmission of GPRS and other networks has been called a data transmission method that has risen rapidly in the past two years.
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Wireless data transmission station
1. Working frequency band of digital radio station
2. Transmission distance of digital radio station
4. Polling mode of digital radio station
5. Cost of using digital radio stations
Wireless data transmission station and wireless data transmission module
Application scenarios of Ebyte digital radio in the Internet of Things
Wireless data transmission station
1. Working frequency band of digital transmission station
According to the frequency planning of the State Radio Regulatory Commission, 223.025M～235.000MHz is used as the frequency band for telemetry, remote control, data transmission and other services, of which the 229.0M～235.0MHz frequency band is used for radio astronomy in Beijing. other services shall not cause harmful interference to it. ≤0.5 watts for close-distance operation (within 1000 meters), ≤5 watts for urban and suburban areas, ≤25 watts for remote suburban and outdoor areas.
Refer article :Application of industrial control of low-power wireless data transmission radio
2. Transmission distance of digital transmission station
The data transmission station is limited by the transmission power, and the maximum transmission distance is only tens of kilometers. Moreover, the ultra-long-distance transmission requires high-power transmission and high-power power supply. This feature determines that the application of digital radio stations can only be limited to a certain area.
3. Polling mode of digital radio station
The data transmission network composed of digital radio stations occupies one frequency resource exclusively, and only one device can send data at the same frequency point at the same time. Generally, the center-to-remote multi-point communication distribution method is adopted, and the polling method is used to query data. The polling cycle is closely related to the number of radio stations. Suppose it takes 0.5 seconds to access a site, the polling waiting timeout is set to 3 seconds, and the system has 100 terminals, then the polling period is 0.5×100=50 seconds when all terminals work normally. If the transmission fails due to failure, frequency interference, etc., the system will wait for 3 seconds at this terminal, and the longest polling period may be 3×100=300 seconds. The polling mode and coverage of the digital radio stations determine that the capacity of the network has a certain limit.
4. The cost of using digital radio stations
The construction cost of the digital transmission station, in addition to the purchase cost of the digital transmission station, also needs to include the construction cost of the base station such as erecting towers and antennas. The longer the transmission distance, the greater the construction cost of the base station. The digital transmission station is built by the user unit itself, and there is no need to pay communication fees, but the frequency occupation fee and the maintenance fee for the radio equipment are also a lot of expenses. The fewer the number of stations, the higher the unit cost.
The construction of digital radio stations is greatly affected by urban construction. The well-built digital transmission network is likely to be blocked by new high-rise buildings in the city. Buildings also have a great impact on the reflection and refraction of radio waves. Self-built radio data transmission network The network must be constantly adjusted to the conditions arising in the construction of the city, including moving the antenna position, increasing the height of the antenna, etc., and possibly adjusting the frequency according to the requirements of the radio regulatory agency if necessary. These take up a large share of the post-running costs, and you never know what work and expenses will be required next.
Wireless data transmission module
The wireless data transmission module is a modular product of the digital transmission station. It refers to a high-performance professional data transmission radio station realized with the help of DSP technology and radio technology. The use of digital radio stations has developed from the earliest button codes, telegraphs, analog radio stations plus wireless modem to the current digital radio stations, DSP, software radio; the transmission signal has also changed from code, low-speed data (300 ~ 1200bps) to high-speed data (N* 64K～N*E1), which can transmit services including remote control telemetry data and dynamic images.
Wireless data transmission is widely used in vehicle monitoring, remote control, telemetry, small wireless networks, wireless meter reading, access control systems, community paging, industrial data acquisition systems, wireless tags, identification, non-contact RF smart cards, small wireless data terminals, security Fire protection system, wireless remote control system, biological signal acquisition, hydrometeorological monitoring, robot control, wireless 232 data communication, wireless 485/422 data communication, digital audio, digital image transmission and other fields.
The establishment of wired communication methods requires erecting cables or digging cable trenches, which requires a lot of manpower and material resources; while using wireless data transmission stations to establish dedicated wireless data transmission methods does not require erecting cables or digging cable trenches, and only needs to be connected at each terminal. The wireless data transmission station and the antenna with proper height can be set up. In contrast, using a wireless data transmission module to establish a dedicated wireless data transmission method saves manpower and material resources, and the investment is quite economical.
Of course, in some short-distance data communication systems, the wireless communication method is not less expensive than the wired method, but sometimes the actual on-site environment is difficult to wire, and customers still choose the wireless method to achieve communication according to the needs of the on-site environment.
When it is necessary to connect and communicate with remote sites with a distance of several kilometers to tens of kilometers, using a wired method requires erecting long-distance cables or digging long cable trenches. This project cycle may take several months. However, using the data transmission module to establish a dedicated wireless data transmission method only needs to set up an antenna of appropriate height, and the project cycle only takes a few days or weeks. In contrast, the wireless method can quickly establish a communication link, and the project The cycle is greatly shortened.
The limitations of wired communication are too large. When encountering some special application environments, such as special geographical environments such as mountains, lakes, and forest areas, or application environments where wiring is difficult such as moving objects, the wired network will be limited. Wiring engineering has extremely strong constraints, and the use of wireless data transmission modules to establish dedicated wireless data transmission methods will not be subject to these restrictions. Therefore, using wireless data transmission modules to establish dedicated wireless data transmission methods will have better and wider coverage than wired communications. The adaptability is almost not limited by the geographical environment.
After users set up a communication network, they often add new equipment due to the needs of the system. If the wired method is used, re-wiring is required, the construction is more troublesome, and the original communication line may be damaged, but if the wireless data transmission station is used to establish a dedicated wireless data transmission method, it is only necessary to connect the new equipment with the wireless data transmission station. The expansion of the system can be realized by connecting each other, which has better scalability in comparison.
Wireless data transmission station and wireless data transmission module
Data transmission radio station and wireless data transmission module are two different devices, and they differ in function and purpose.
Digital radio: A digital radio is a radio device dedicated to digital data transmission. It usually consists of components such as modems, signal processors, power amplifiers and radio transmitters. The data transmission station modulates the data signal, converts it into a form suitable for wireless transmission, and then sends the signal into the air in the form of radio waves through the antenna. Digital radios can be used to broadcast digital audio, video, data streams or other forms of digital information.
Wireless data transmission module: The wireless data transmission module is a small electronic device that integrates wireless communication functions. It usually contains a wireless transceiver, modem, antenna and other necessary electronic components. Wireless data transmission modules are used to integrate wireless communication capabilities into other devices and systems, such as IoT devices, sensor networks, smart home devices, etc. Wireless data transmission modules are usually pre-designed modular solutions that are easy to integrate and use.
To sum up, the digital transmission radio is more inclined to be an independent device for specialized digital data transmission applications, while the wireless data transmission module is more inclined to be an integrated communication solution for adding wireless communication functions to other devices middle. Digital radio stations usually have more complex functions and flexibility, while wireless data transmission modules focus more on providing wireless communication capabilities that are easy to integrate and use.
Wireless data transmission station and booster antenna
The wireless data transmission station is responsible for modulating and demodulating the data and converting it into a form suitable for wireless transmission. It sends data over the air over radio waves so a receiver can receive and decode the data. The performance and functions of the wireless data transmission station directly affect the effect of data transmission.
The booster antenna plays a role in enhancing the wireless signal. It provides higher signal gain than traditional antennas by focusing the radiated energy of the signal in a specific direction. The booster antenna can increase the transmission distance, penetration and receiving sensitivity of the signal, thereby improving the performance of the communication system. It can receive and transmit signals better, reducing signal attenuation and interference.
Therefore, wireless data transmission stations and booster antennas are usually used together to improve the overall performance of the wireless communication system. The wireless data transmission station is responsible for processing the modulation and demodulation of data and signals, while the booster antenna enhances the transmission and reception capabilities of signals. Their synergy can provide more reliable, stable and efficient data transmission.
Application Scenarios of Internet of Things for Ebyte Digital Radio Station
Ebyte digital radio is suitable for all kinds of point-to-point and one-to-multipoint wireless data transmission systems, such as smart home, Internet of Things transformation, power load monitoring, distribution network automation, hydrology and water regime monitoring, tap water pipe network monitoring, urban street lights Monitoring, air defense alarm control, railway signal monitoring, centralized control of railway water supply, oil and gas supply pipeline network monitoring, GPS positioning system, remote meter reading, electronic crane scale, automatic target reporting, earthquake forecasting, fire prevention and anti-theft, environmental monitoring and other industrial automation system.
E800-DTU is a wireless data transmission station that adopts digital signal processing, digital modulation and demodulation, forward error correction, equalization soft decision and other functions. Different from the analog digital radio with analog FM radio plus MODEM, the digital radio provides transparent RS232 or RS485 interface.
[Introduction]：E800-DTU(433L20-232) is a wireless data transceiver with the function of digital data processing, digital modulation and demodulation, FEC, balanced soft decision, etc.. Wireless data transceiver provides transparent RS232 / RS485 interface, different with the analog FM transceiver plus MODEM analog digital transceiver.
All core components are imported with original packaging. Compared with the current similar imported digital radios, it has the most advanced functions, the smallest volume and the best price.
The transmission power is optional, and all technical indicators meet European industrial standards.
Using temperature compensated crystal oscillator, the frequency stability is better than ±2ppm.
Working temperature range: -40℃～+85℃, suitable for various harsh working environments, real industrial grade products. All aluminum alloy shell, compact size, easy installation, good heat dissipation; perfect shielding design, good electromagnetic compatibility, strong anti-interference ability.
Power supply reverse connection protection, over-connection protection, antenna surge protection and other multiple protection functions greatly increase the reliability of the radio.
Powerful software functions, all parameters can be set by programming: such as power, frequency, air rate, address ID, etc.
Ultra-low power consumption, the waiting current is only 20mA (lower power consumption in power saving mode and sleep mode), and the emission current is ≤350mA (at 1W).
Built-in watchdog, and precise time layout, once an abnormality occurs, the module will automatically restart, and can continue to work according to the previous parameter settings.
2. Introduction of E810-DTU
E810-DTU is a small, powerful Ethernet to RF module. The transparent transmission between the RJ45 Ethernet interface and the wireless module is realized. The module can be connected with the host computer through the Ethernet interface to achieve high-speed transmission. Using the Ethernet interface allows the radio station to be connected to the LAN to make the signal transmission distance more possible.
E810-DTU(RS485)-V2.0 RS485 to Ethernet single serial port server
[Feature]：232/485 to Ethernet
[Introduction]：E810-DTU(RS485)-V2.0 is a RS485 to Ethernet single serial port server. Realize data transparent transmission between RJ45 network port and RS485/RS232.The module is equipped with a M0+ series of 32-bit processors, fast and efficient.It has an adaptive network speed (up to 100M full duplex), and has four communication mechanisms, TCP Server, TCP Client, UDP Server, and UDP Client.The E810-DTU(RS485)-V2.0 is easy to operate.
The E810-DTU series can realize intercommunication with the same type of E800-DTU products, so that the data of the industrial site can be uploaded to the upper computer for storage in real time.
Ebyte provides an overall communication solution, starting with the solution, packaging and solving communication problems for customers, and also providing antenna customization projects to solve various problems encountered in the communication system for customers.
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