The wireless transmission method is to use radio waves to transmit alarm signals. This method needs to be equipped with transmitters and receivers. The detectors and transmitters are connected. The detectors can be of various types. The wireless alarm system adopts a microcomputer encoding control method, that is, through the automatic error detection and error correction technology of the microcomputer, the reliability and anti-interference of the wireless alarm system are improved, but the transmission of the wireless signal is affected by the transmitter power, receiver sensitivity, terrain, The impact of building structures, etc., must be carefully debugged before installation and use, and interference signals of the same frequency or adjacent frequencies should be avoided in the same area. Now, our country's wireless alarm system provides for the use of radio frequency 315MHZ or 433MHZ wireless transceiver circuit, often using hardware or software codec.
Since the wireless alarm does not require wiring, it not only saves wire costs but also has a great installation advantage in the renovated house. The biggest drawback of wireless alarms is poor security and easy interference. Like frequency interference, environmental interference. In addition, wireless hosts in China are rarely able to detect the status of wireless detectors and battery life. It should be said that wireless alarms are relatively large. The wireless controllers of international famous brands will adopt multi-frequency communication, two-way communication and other technologies, and the safety and reliability can be greatly improved, but the price will rise accordingly.
At present, people are still doubtful about the stability of wireless signal transmission. For example, the wireless product transmission is easily affected by lightning, electromagnetic interference, etc., and the stability of the signal is greatly reduced. At present, the development of frequency hopping technology has greatly enhanced wireless. Transmission anti-jamming, when the wireless signal is interfered, it will automatically jump to another channel to ensure the stability of the wireless signal transmission. And the general civilian security is much lower than the requirements of important institutions such as finance, so wireless security products can fully meet the needs of civilian security.
For the stability of wireless signal transmission, reliability and other issues have foreign brands, such as Israel's Agility wireless alarm system has taken corresponding strong measures:
1. Two-way wireless technology, confirmation signal feedback: The traditional wireless detection equipment has a defect, that is, whether the controller successfully receives the alarm signal after the front-end detector detects the alarm sent to the controller. Both parties are not aware of this. . Then, the Agility wireless alarm system's two-way wireless confirmation technology can solve such problems. The front-end detector sends an alarm signal to the controller. When the alarm controller successfully receives the alarm signal, it immediately returns a confirmation signal to the front-end detector to ensure the correct transmission of the alarm signal. It can be said that the two-way wireless confirmation technology is in the alarm product. Rare.
2. Electromagnetic environment and detector status monitoring: With the increasing seriousness of wireless electromagnetic interference, the application environment has become very complex, which also hinders the application of wireless devices. The key issue is that traditional technologies cannot rely on environmental electromagnetic interference and front-end The state of the wireless detector is used to propose corresponding technical solutions, which increases the chance of the detector being affected by electromagnetic interference from the environment and weakens the strength of the wireless signal of the detector. In addition, the influence of the lack of detector battery power also makes the system unable to work properly. , And affect the effective transmission of alarm information, resulting in detector detection distance becomes shorter, does not work, leakage / false positives and other phenomena. Then Rescor's Agility alarm system is equipped with environmental background noise, wireless detector signal strength, and wireless detector power state detection function. It can visually display the background noise size and detector signal in digital form on the system operation keyboard. Strength and detector energy storage capacity, it will be very convenient for engineering personnel and users to choose the most appropriate installation program, can replace the detector battery in time, so that the alarm system is always in a good working condition, not just become a decoration.
Also, Honeywell’s 58×× wireless protocol designed for wireless RF 315MHz and 433MHz, as well as GWP wireless protocol based on frequency-modulated spread spectrum technology, can greatly improve the security and bandwidth of signal transmission, and it has only a few powerful ones. The company will have its own agreement.
Since the wireless alarm does not require wiring, it not only saves wire costs but also has a great installation advantage in the renovated house. The biggest drawback of wireless alarms is poor security and easy interference. Like frequency interference, environmental interference. In addition, wireless hosts in China are rarely able to detect the status of wireless detectors and battery life. It should be said that wireless alarms are relatively large. The wireless controllers of international famous brands will adopt multi-frequency communication, two-way communication and other technologies, and the safety and reliability can be greatly improved, but the price will rise accordingly.
At present, people are still doubtful about the stability of wireless signal transmission. For example, the wireless product transmission is easily affected by lightning, electromagnetic interference, etc., and the stability of the signal is greatly reduced. At present, the development of frequency hopping technology has greatly enhanced wireless. Transmission anti-jamming, when the wireless signal is interfered, it will automatically jump to another channel to ensure the stability of the wireless signal transmission. And the general civilian security is much lower than the requirements of important institutions such as finance, so wireless security products can fully meet the needs of civilian security.
For the stability of wireless signal transmission, reliability and other issues have foreign brands, such as Israel's Agility wireless alarm system has taken corresponding strong measures:
1. Two-way wireless technology, confirmation signal feedback: The traditional wireless detection equipment has a defect, that is, whether the controller successfully receives the alarm signal after the front-end detector detects the alarm sent to the controller. Both parties are not aware of this. . Then, the Agility wireless alarm system's two-way wireless confirmation technology can solve such problems. The front-end detector sends an alarm signal to the controller. When the alarm controller successfully receives the alarm signal, it immediately returns a confirmation signal to the front-end detector to ensure the correct transmission of the alarm signal. It can be said that the two-way wireless confirmation technology is in the alarm product. Rare.
2. Electromagnetic environment and detector status monitoring: With the increasing seriousness of wireless electromagnetic interference, the application environment has become very complex, which also hinders the application of wireless devices. The key issue is that traditional technologies cannot rely on environmental electromagnetic interference and front-end The state of the wireless detector is used to propose corresponding technical solutions, which increases the chance of the detector being affected by electromagnetic interference from the environment and weakens the strength of the wireless signal of the detector. In addition, the influence of the lack of detector battery power also makes the system unable to work properly. , And affect the effective transmission of alarm information, resulting in detector detection distance becomes shorter, does not work, leakage / false positives and other phenomena. Then Rescor's Agility alarm system is equipped with environmental background noise, wireless detector signal strength, and wireless detector power state detection function. It can visually display the background noise size and detector signal in digital form on the system operation keyboard. Strength and detector energy storage capacity, it will be very convenient for engineering personnel and users to choose the most appropriate installation program, can replace the detector battery in time, so that the alarm system is always in a good working condition, not just become a decoration.
Also, Honeywell’s 58×× wireless protocol designed for wireless RF 315MHz and 433MHz, as well as GWP wireless protocol based on frequency-modulated spread spectrum technology, can greatly improve the security and bandwidth of signal transmission, and it has only a few powerful ones. The company will have its own agreement.
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