chrispeng [ad_1]
The first section system introduction:
According to the national standard GB14287-2005 “Electrical Fire Monitoring System” and related specifications “Design Method of Electrical Fire Monitoring System”, the basic composition of an electrical fire monitoring system should include: electrical fire monitoring equipment, residual current electrical fire monitoring detectors and measuring It is composed of three most basic types including temperature-type electrical fire monitoring detectors.Among them, the residual current electrical fire monitoring detector is composed of a monitoring detector and a residual current transformer (closed type and open type); the temperature measuring electrical fire monitoring detector consists of a monitoring detector and a temperature measurementsensorConstituted. This system focuses on the collection and transmission system in the monitoring system. The system connection diagram is as follows:
The development of wireless technology to today, especially the emergence of broadband spread spectrum technology, has greatly improved the reliability of wireless communication, and in some environments, it even exceeds the reliability of wired communication. In many occasions, the overall performance is far better than the limited transmission system. This system uses the new generation of wireless transmission technology developed based on DSSS technology provided by West Valley Sugon. Greatly improve the reliability of transmission and the stability of the system.
System composition: This system scheme adopts the mature and new generation 2.4G RFID active of Chengdu Xigu Suguangelectronic labelsystem. Chengdu West Valley Shuguang Digital Technology Co., Ltd. was founded in June 2004 by a Chinese-American returning doctor studying abroad. After 8 years of technology accumulation and continuous innovation and practice, the company has developed a whole set of world-leading wireless smart sensors. Network technology system, namely LDSW (Low Duty Cycle Smart Wireless), a four-in-one wireless intelligent communication technology with ultra-low power consumption and ultra-long distance. Its biggest feature is that under the premise of ultra-low duty cycle operation of wireless communication equipment, it uses patented technologies such as “DNA detection” and “multi-channel collaborative work” in the same system to achieve ultra-long-distance, fast, flexible and reliable two-way communication. Low-cost to meet the needs of various underlying information collection and transmission of the Internet of Things. It upgrades the generally simple and low-cost miniature active electronic tag to a “wireless smart tag” with high work flexibility, ultra-low power consumption, ultra-long distance, and can run programs autonomously without increasing hardware costs. terminal”. LDSW integrates multiple functions such as radio frequency identification, wireless sensor network, real-time positioning, wireless telemetry and remote control. It solves the biggest problem in the development of the Internet of Things industry-how to realize the wireless collection and transmission of various “things” information under the public network at low cost and ultra-low power consumption. LDSW has been repeatedly verified, perfected and precipitated for a long time, and its leading position has been recognized by the domestic and foreign industries.
There are four types of equipment used in this system: sensors, access devices, concentrators, and signal detectors. The basic design idea is as follows.
The sensor is used in the fault alarm signal detection equipment in the previous description, used to detect various signals (such as leakage, temperature, etc.), and the collected signals are output through the RS485 interface.
After the sensor detects the signal, the sensor’s working status (normal, alarm, etc.) is transmitted to the accessor through rs485, and the accessor is sent to the concentrator through a 2.4G radio frequency signal.
The concentrator receives the receiver data in each range and sends it to the cloud platform through the network or optical fiber.
The data of the cloud platform is used to provide various customer security management and early warning services.
In the traditional mode, the connection between the sensor and the concentrator is wired, and the networking methods are different (such as RS485, CAN, etc.). Compared with the traditional electrical fire monitoring system, this monitoring system has the following advantages:
1. Real-time monitoring, combined with mobile Internet, eliminates time and space constraints. The monitoring platform collects on-site monitoring data in real time and actively pushes it to users. No matter where the user is, as long as there is mobile internet data or mobile phone signal, the real-time status and data of the monitoring site can be received/inquired through the network or SMS.
2. The project is simple. Because the IoT communication equipment can choose different types of wireless interconnection equipment, there is no need for engineering wiring during installation, and there is no need to cut off the normal power supply. It is especially suitable for use in environments where there are no conditions for rewiring and old buildings.
3. The cost is greatly reduced. This system adopts wireless working mode, which saves the cost of on-site installation and wiring, and can use one reader to manage multiple sensors (up to dozens of sensors), compared with the original wired system A single reader manages the working mode of a sensor, which saves the amount of readers, and the overall cost floats by 15—35%.
4. Mature anti-collision processing mechanism. This system uses the mature anti-collision mechanism of opportunistic active electronic tags, which effectively solves the problem of reliable transmission of multiple terminals and effectively avoids the collision problem of multiple terminals transmitting to the center at the same time.
5. Strong independence, each terminal sensor has no electrical connection with each other, and their respective faults have little influence on each other.
6. The hardware has strong scalability, and adding or reducing terminal sensors has almost no effect on engineering installation.
7. Strong anti-interference ability. The use of DSSS broadband direct sequence spread spectrum technology greatly improves the anti-interference ability of wireless communication and improves communication reliability. Combined with the protocol fault-tolerant processing mechanism in the West Valley LDSW system, the reliability of the transmission system is guaranteed .
[ad_2]
