Can I Reuse Connections on a 66 Punchdown Block?

yes you should. the punch down tool has a cutting edge. the only reason they will stay spread is if there is still a bit of wire caught at the base or you used way too big a wire size

Can I Reuse Connections on a 66 Punchdown Block? 1

1. Can i wire my radio to a memory wire?

the memory twine does precisely what it says retains the memory on your radio to illustrate your clock and preset channels. verify your floor twine returned be certain its good. the only different ones you ought to have is your consistent that's your memory and your ignition twine which turns it on.

2. What type of concrete should I use for the foundation of a storage shed.?

3-4 inch pad. yes you can use bags of concrete. use wire only if you going to use alot of weight on the pad otherwise i wouldnt bother with it. alot of weight meaning pulling a car in there. make sure your concrete isnt mixed thick because you want a good curing time so it wont crack.

Can I Reuse Connections on a 66 Punchdown Block? 2

3. How does the Earth work, as an omnipresent, conductive surface in an electrical distribution system?

Ok, first, are you talking about the Earth as in the dirt?Or the Earth as in the grounding system.I will assume you are talking about the wires that are usually Green, or Green and yellow stripes, or in some cases in the USA bare.. although in most countries a sleeve is required over them. This wire is used to protect us in case of electrical faults such as short circuits that occur. It helps to move a lot of current in a hurry on an alternate path, to help the breakers to trip. It also tries to carry the excess fault current to the ground. . via the Ground Rods along the system. Old houses used to be built without it, and were safe but, not as safe as that extra bit of wire make us. Older houses had wiring that was more accessible to kids, which led to many kids dying from doing stupid things, which is how kids learn, actually.The ground helps shunt the excess current to shut the breaker, so you can help find the problems in a way, and it means that electric cord you had for thirty years that kept being slowly damaged by the rocking chair has less chance of catching your home on fire when it shorts out. But Omni Present??? If only. .I mean, it is a wire, put in place, hopefully, by a qualified person who knows what size to put in what place and properly installed it along all parts of the system.It is not God.How does the Earth work, as an omnipresent, conductive surface in an electrical distribution system?

4. On a avarage, how many watts of electricity is being used during the week of burning man?

Ask a silly question, get a silly answer... Go to Burning Man. Take a large supply of watt-hour meters (both AC and DC) and fifty-dollar bills and a large assortment of wire, connectors and so forth. Use the money to persuade each electricity user to install your meter in his device(s). At the end of the week, collect your meters, add up the total watt-hours used and divide by 168 to get average instantaneous watts. Sell your meters on the surplus market. Addendum: Do not forget to bring plenty of water. A supply of semi-naked women might assist you in your blandishments of the electricity users, but you might also find them a glut on the market.

5. how to wire a 3 wire ceiling fan with light to a 2 wire power source?

The lights turn? Wha? Lol Going to need to know if it's a single pole or not. (do you have 1 switch working the fan, or 2?) Sound like you need a ground to me on the house side. There should be a ground in every junction box, with every line carrying power. I am assuming the white and black are the power side colors?

6. How Locking Wire Is Used to Secure Fasteners

Have you heard of locking wire? It's used extensively in the aerospace and manufacturing industries to secure fasteners in place. Not all fasteners require locking wire. If a fastener is exposed to constant and/or forceful vibrations, however, this otherwise simple component could prove invaluable. Unless you are familiar with it, though, you might be wondering how exactly locking wire is able to secure fasteners in place. Also known as safety wire, locking wire consists of metal wire - usually about 0.5 to 1 millimeters in diameter - that's wrapped around one or more fasteners. Whether it's a screw, bolt or any other type of fastener, it's not uncommon for vibrations to loosen and dislodge fasteners from the respective object in which they are installed. An airplane, for example, will produce heavy vibrations during operation that may cause bolts to loosen over time. Locking wire, however, prevents this from happening by holding the respective fastener or fasteners in place. When a company is manufacturing a product, it may use locking wire in conjunction with one or more fasteners. Although it sounds like a complex tool, locking wire is actually pretty simple and straightforward. First and foremost, the fasteners are inserted into the appropriate object. After installing the fasteners, a worker then wraps the locking wire around the head of the fasteners. If two fasteners are used, for example, locking wire may be wrapped around both heads of the fasteners. The Different Types of Locking Wire All locking wire is designed to secure fasteners in place, but there are several different types of locking wire, each of which is unique. The most common type of locking wire is medium-gauge stainless steel wire. It consists entirely of stainless steel strands, which are woven together to provide a superior level of strength. The size of locking wire also varies. As previously mentioned, most locking wire measures about 0.5 to 1 millimeters in diameter. Some, however, can measure over 1.5 millimeters in diameter. Thicker locking wire offers a higher level of protection against vibrations. If the locking wire is too thick, on the other hand, it may not fit over the heads of the fasteners with which it's used. Neither locking wire nor any other locking solution is a foolproof means of securing a fastener. With that said, it can certainly help to prevent fasteners from loosening due to vibrations. Locking wire is wrapped around the heads of fasteners, thereby holding them in place. No tags for this post.

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Can You Use Wireless Internet to Play Multiplayer Games on Xbox 360?
Can You Use Wireless Internet to Play Multiplayer Games on Xbox 360?
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Can I Use Any Wireless LAN Adapter with My Toshiba Blueray Player?
Can I Use Any Wireless LAN Adapter with My Toshiba Blueray Player?
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Multi Function Converter: 500M Micro Power 485 Turn Wireless Data Transmission
Multi Function Converter: 500M Micro Power 485 Turn Wireless Data Transmission
Td-8305s is a RS-485 / 'target ='_ Blank '> converter from RS-485 to wireless data transmission. It is a professional design to solve the short-range wireless data transmission of serial port equipment. Td-8305s wireless data converter provides standard RS-485 / 'target ='_ Blank '> RS-485 interface mode, which can transparently and effectively transmit RS-232 serial port signals for 500 meters, so that users can complete communication without changing existing software. Td-8305s works in pairs, which can better stably transmit serial port signals to the equipment. Td-830sr can connect point-to-point, point to multipoint and multipoint to point, so that users can further build a large system serial port to wireless network.》》Product features:1. The sight distance is reliable, and the transmission distance can reach 500m; FSK modulation mode is adopted2. The carrier frequency is 433 MHz, and other carrier frequencies such as 315m / 868m / 915m can also be customized; ISM band, no application required3. 8 channels are provided, which can be extended to 16 channels if required by the user4. Interface mode: TTL / RS485 is selected by the user5. Interface format: 8n1 / 8e1 / 8o1 (special format needs to be set)6. Integrated transceiver, half duplex, data transceiver conversion is completed automatically, as long as data is received / sent to the interface, and the conversion time is short7. It can be used for point-to-point, point to multipoint, multipoint to point and other communication combinations8. Data is transmitted transparently, and longer data frames can be transmitted9. Three power saving modes: Hardware wake-up, serial port wake-up and air wake-up10. Automatically filter out false data generated in the air, with good long-term reliability and low failure rate》》Technical parameters:◆ transmission distance: 300-500m (sight distance)◆ working frequency: 433MHz◆ number of channels: 8◆ transmitting power: ≤ 100MW◆ power consumption of equipment: Power: 100MW, receiving current: 20mA, transmitting current: 100mA, current during sleep: 1uA◆ receiving sensitivity: - 121dbm◆ emission current: 100mA◆ receiving current: 20mA◆ sleep current: ≤ 1uA◆ channel rate: 1200 / 2400 / 4800 / 9600 / 19200 / 38400bit / s, which can be set by the user◆ serial port rate: 1200 / 2400 / 4800 / 9600 / 19200 / 38400bit / s, which can be set by the user◆ sending and receiving time: 10ms◆ data format: 8e1 / 8n1 / 8o1◆ working power supply: RS232 / RS485: 5 ± 0.5V, TTL: 2.7 3.6V, 3.6 5.5V DC◆ working temperature: - 20 ℃ 65 ℃◆ working humidity: 10% 90% relative humidity, no condensation◆ overall dimension: 44mm & tides; 27mm & tides; 8mm (excluding antenna)◆ quality assurance: three years》》Application fields:Wireless meter reading, electronic weighing instrument, wireless queuing, physique intelligent detection, industrial equipment data acquisition, PTZ control, wireless ordering machine. Water and electricity three meters, smart card, access control and attendance, wireless queuing, PTZ control, building control, freight yard logistics, anti-theft alarm, intelligent instruments and meters, reactive power compensation, intelligent teaching equipment, physique detection intelligent equipment, measuring equipment, automobile Data control and data transcription in the fields of car black box, automatic control, home intelligence and so on.
What Is the Principle of Diode Detection?
What Is the Principle of Diode Detection?
What is the principle of diode detection?Detection generalized detection is usually called demodulation. It is the inverse process of modulation, that is, the process of extracting the modulated signal from the modulated wave. Amplitude modulation wave is the process of extracting modulation signal from its amplitude change; For frequency modulated wave, it is the process of extracting modulated signal from its frequency change; Phase modulation wave is the process of extracting modulation signal from its phase change. Detection in a narrow sense refers to the process of extracting modulated signal from the envelope of amplitude modulated wave., Sometimes this kind of detection is called envelope detection or amplitude detection. Figure 1-20-21 shows the principle of this detection: first let the amplitude modulation wave detector (usually crystal diode) to obtain the pulsating current varying according to the amplitude modulation wave envelope, and then a low-pass filter filters out the high-frequency components to obtain the modulation signal reflecting the amplitude modulation wave envelope. Demodulation of AM wave is the process of taking out the modulated signal from the AM signal, which is usually called detection. The demodulation methods of AM wave include diode envelope detector and synchronous detector. No matter what kind of amplitude modulation signal, it can be demodulated by a synchronous detection circuit composed of a multiplier and a low-pass filter., For ordinary amplitude modulation signal, its carrier component is suppressed, and the direct multiplication of nonlinear devices is realized to obtain the required demodulation voltage without adding another synchronization signal. This amplitude detector is usually called envelope detector. At present, the most widely used is the diode envelope detector, while in the integrated circuit, the triode emitter envelope detector is mainly used. Synchronous detection, also known as coherent detection, is mainly used to demodulate double sideband and single sideband modulated signals. It has two implementation circuits. One consists of a multiplier and a low-pass filter, and the other directly uses diode envelope detection. In engineering, there is a kind of signal called amplitude modulated wave signal (AM signal), which is a special signal that uses low-frequency signal to control the amplitude of high-frequency signal. The circuit that takes out the low-frequency signal is called the detection circuit. The simplest am wave detection circuit is composed of diodes. Detection diode has the characteristics of low junction capacitance, high working frequency and small reverse current. It is traditionally used for AM signal detection. The principle of diode detection is as follows: the AM signal is a high-frequency signal carrying a low-frequency signal, and the envelope of the AM signal is the baseband low-frequency signal. If the average value is taken in each signal cycle, it will always be zero. If the AM signal is passed through the detector diode, the unidirectional conductivity of the detector diode and the negative part of the AM signal are intercepted, leaving only the positive part. For example, taking the average value (low-pass filtering) in each signal cycle, the envelope obtained as the AM signal is the baseband low-frequency signal, realizing the demodulation (detection) function. Principle of diode detection: amplitude modulated wave signal is the input of diode detection circuit. The diode only allows unidirectional conduction. If silicon tube is used, only the part with voltage higher than 0.7V passes through the diode., The output end of the diode is connected with a capacitor. The capacitor and resistance cooperate to short circuit the high-frequency signal in the diode output to the ground, so that the output signal is basically a signal envelope. The function of this circuit composed of capacitance and resistance is called filtering. Germanium material point contact type, working frequency up to 400MHz, small forward voltage drop, small junction capacitance, high detection efficiency and good frequency characteristics. It is 2AP type. Similar to the point contact type, the diode for detection is not only used for detection, but also used in amplitude limiting, clipping, modulation, mixing, switching and other circuits. There are also two diode assemblies with good characteristic consistency for FM detection.
Development History and Future Trend of Smart Home Wireless Protocol
Development History and Future Trend of Smart Home Wireless Protocol
According to a recent report by crimson hexagon, "from 2014 to 2017, smart home technology began to receive widespread attention, and more than 60% of consumers showed great interest in smart home technology." if you work in the Internet of things industry, you may be familiar with reports and data, Because this indicates the future market development opportunities of intelligent networked families.We all know that when consumers buy smart home products, they are often affected by many factors, such as entertainment, convenience, security, improving household energy efficiency and reducing energy expenditure. However, behind these, we all know that one of the biggest obstacles to the development of smart home is the interoperability of smart home devices and more and more wireless protocols.Wireless protocols such as Z-Wave and Wi Fi are important pillars of the Internet of things infrastructure; In some cases, these languages used between devices create fragmented or closed ecosystems, which often cause confusion and application obstacles to end users.With the increasing popularity of modern smart home, the number of corresponding protocols and functions is also increasing. Although engineers, developers and manufacturers all try to create products that they think have the best user experience and introduce new protocols and technologies, everyone wants to unify standards and connect and control all products. In order to better understand how we reach the current protocol state of smart home, let's look at a short history.Internet of things before Internet of thingsFirst, what is the function of wireless protocol in smart home?In short, a protocol is a language or function of how devices communicate and understand each other. Many people believe that the emergence of modern smart home protocol can be traced back to the creation of x10 (an international common smart home power carrier protocol) in the 1970s. It is the first general communication protocol for electronic devices. Soon after, various other protocols were developed, including Z-Wave, and UPB (universal power line bus), Wi Fi and insteon (a two-way hybrid communication technology with low complexity, low power consumption, low data transmission rate and low cost, with the characteristics of instant response, easy installation, easy use, economic reliability and compatibility with X10) to solve various problems in the consumer electronics and home control market.Released in 1999, UPB uses power line wiring for signal and control to provide a high level of reliability and transmission rate through existing wires in the home. This is a highly technical technology, which is difficult to adopt for DIY people who have little corresponding technical knowledge. In addition, Wi Fi was introduced in the early 1990s to transmit a large amount of data. Today, Wi Fi allows devices to connect in smart homes and allows users to enjoy remote control of home devices. However, Wi Fi does exist and faces challenges such as high interference and high power consumption, which is not ideal for battery powered products.Following Wi Fi, new generation protocols such as Z-Wave and insteon enhance network signals by providing efficient and low-power connections and using mesh networks, which are mainly designed for home control.Early technology of smart homeInsteon is designed by smartlabs Inc. to solve the connection between power line and wireless protocol. They were a unique solution at that time, but their closed ecosystem made it difficult for consumers to adopt.As an early mesh network technology, ZigBee was developed by HomeRF alliance. It is a wireless proprietary protocol with many different "profiles", which is mainly used in commercial, energy and remote control markets. Like ZigBee, Z-Wave is also a mesh network protocol, which was launched by the Danish company zensys in 2001 and is now owned by silicon labs.Z-Wave is specially built for smart home; Home control enthusiasts and developers know that in order to succeed, the standard must not only use low-power power power, but also not interfere with other home electronics, but also become stronger with the increase of equipment. As one of the original network technologies of home control, the tradition of Z-Wave continues today. Z-Wave is supported by the Z-Wave alliance, a member alliance of industry leaders committed to promoting standards. At the time of writing, Z-Wave has more than 2400 certified Z-Wave devices and more than 700 members.New member of smart home protocolIn the past few years, with the development of smart home technology, the demand for low-power mesh network as the technical pillar of smart home has prompted other standards organizations to constantly explore their own technology. We have seen that existing standards organizations such as thread (jointly launched by Samsung, nest, arm, big ass fans, Freescale and silicon labs, which is an IP based wireless network protocol used to connect smart products at home) and Bluetooth Technology Organization (SIG) and Wi Fi alliance have announced their own versions of Bluetooth mesh network and Wi Fi halow mesh network protocol.Thread was launched by Google and other large companies interested in smart home in 2014. Thread naturally supports IPv6 and aims to cooperate with Google and nest, but does not solve the problem of product level interoperability. Bluetooth grid was officially launched by sig in 2017. It has different functions compared with the known Bluetooth point-to-point communication. For the wi fihalow mesh network protocol, engineers from major chipset suppliers are worried about the power consumption of WiFi halow. They are worried that the protocol will consume too much energy for battery powered smart home devices.In addition, many newer protocols, such as Wi Fi halow, may take a long time to be adopted by manufacturers and create reasonable products for consumers, which is a major obstacle to their development.How will the smart home protocol develop in the future?The smart home market will continue to grow. So far, we have not seen enough signs that a certain standard or technology will dominate the world in the future. But we have a responsibility to help consumers understand the products they bring home and the role of each technology in practical application.For example, Wi Fi will become an integral part of the connection of all smart home products, especially if users want to be able to remotely access their devices outside the home. Bluetooth will play a key role in the smart lock market, so that consumers can easily open the door when they walk to the front door with a smart phone. Z-Wave is still a prominent technology in the security system. It connects lights, temperature controllers, door locks, sensors and other peripheral devices to make the family truly intelligent.At present, the commonly used network protocols include WiFi, Bluetooth, ZigBee and Z-Wave, but they all have shortcomings, such as:WiFi has high power consumption and is suitable for transmitting a large amount of data;Bluetooth power consumption is relatively low, but there is still a chaotic situation in which Bluetooth 2.0 and Bluetooth 4.0 coexist, and IPv6 is not supported;ZigBee technology is complex and the R & D cost is high;Z-Wave is led by zensys, a Danish company, and is not as strong as ZigBee Alliance for the time being.All wireless protocols have their advantages and disadvantages, but the most important selection factors are still interoperability and security, as well as more product choices. It depends on all of us, including everyone in the smart home ecosystem such as standards organizations, manufacturers, retailers and developers, to jointly promote and realize the interconnected smart home life.
How Is the Wireless Ad Hoc Network Technology Applied in the Process of Emergency Communication Supp
How Is the Wireless Ad Hoc Network Technology Applied in the Process of Emergency Communication Supp
In modern society, communication system can be said to be the lifeblood of a country. The normal operation of communication system is closely related to the development of modern society. When the wired communication optical cable, wireless communication base station and other communication facilities in the affected areas are damaged, the communication with the outside world is interrupted and cannot be repaired in a short time, which hinders the implementation of rescue and disaster relief by government departments.Emergency communication support system is a temporary communication system established by the state in the face of social emergencies, with the main goal of ensuring communication function. In recent years, with the progress of national security capacity, higher requirements have been put forward for the security capacity in case of emergencies. The state is vigorously developing and building emergency communication security system to face social emergencies more fully. However, the current emergency communication support system is still not enough to fully meet the needs of dealing with emergencies, and there are still many deficiencies with developed countries.With the progress of science and technology and the promotion of technological change and renewal, with the help of the superior processing capacity of new technology, we will be able to more quickly establish an emergency communication support system to ensure the safety of people's lives and property in disasters. Compared with other communication systems, emergency communication support system has many uniqueness.Most natural disasters occur suddenly. In this case, the primary requirement for communication function is timeliness. Time is life. Disaster events can cause huge losses in a short time. By establishing an emergency communication system every morning, the rescue center can grasp the scope of hazards of disaster events and the disaster situation of the people, so as to better dispatch rescue activities and carry out disaster relief more efficiently. Moreover, it is unpredictable. We can't predict where and what kind of disaster will happen next, so we can only accept it passively. Therefore, the emergency communication support system needs to be prepared for various events and can take effective solutions in the face of various complex situations.Wireless ad hoc network technology is a high-tech technology born by the organic combination of computer network technology and mobile wireless communication technology. It is composed of a group of units equipped with wireless transceiver devices. Each unit not only has a receiving device, but also can play a communication role as a transmitting device. In the traditional mobile wireless technology, there is a router transmitting unit, and each of the other units can only passively receive information from the transmitting unit and can not transmit information to other units. When the router is damaged in an emergency, the other units will lose contact.In the wireless ad hoc network technology, each unit can participate in the communication process. In an emergency, even if one unit is damaged, other units can still communicate with each other and play a communication role. Wireless ad hoc network technology has the characteristics of no network control center, rapid deployment, temporary networking and strong anti-destructive, including wireless sensor network, wireless mesh network, ad hoc network, etc.In wireless ad hoc networks, the lines between units are usually composed of multiple segments. Although the wireless transmission distance is limited, the goal of mutual communication between two units far away can be achieved by increasing the connection of intermediate units. Ad hoc network is a special wireless network. It can automatically form a network without a preset base station. It has strong anti-destruction and has great development prospects in both military and civil fields.The research of ad hoc network spans a wide range, including cross layer design, network architecture, information security transmission and so on. With the development of technology, ad hoc network has derived technologies such as wireless mesh network (WMN). Mesh network has strong self-healing ability. With the help of mesh backbone router, it shows a new idea of wireless network access.The portable mobile communication network based on the mobile base station can use the mesh network to establish a certain range of network connection anytime and anywhere. It can establish a communication platform on land, sea and air according to the environmental needs. It can support local communication without preset infrastructure. It can flexibly adjust the network settings with little human intervention. This portable mobile communication network can be used in various places where it is difficult to recover communication in a short time. Rescuers can use the portable mobile communication network to establish the communication network very conveniently.In some large-scale natural disasters, some base stations of cellular network are damaged. The technical advantages of ad hoc network and cellular network can be used to build a hybrid wireless communication network. In this hybrid network, the terminal carried by the rescuers can choose to access either cellular mode or ad hoc mode. Under normal circumstances, using cellular mode, the data will be sent to the available base station. When the base station fails and cannot be accessed directly, the terminal will automatically adjust to ad hoc mode and find a line to the base station through multi hop transmission, Finally, the purpose of establishing communication is achieved.In this mode, it can not only complete the task of establishing communication, but also make efficient use of the remaining effective resources. The hybrid wireless communication network must have at least two wireless network interfaces, one cellular network interface is used to communicate with the base station and the other is used to communicate with other mobile terminals.When a sudden emergency occurs in the country, the emergency communication guarantee function is particularly important. By establishing a more perfect emergency communication support system, the support in case of emergency can be more clear and efficient, and the loss in the event can be minimized. Wireless ad hoc network technology can automatically form a network without a preset base station, which has strong flexibility and loss resistance. In the face of complex forms in various emergencies, wireless ad hoc network technology can play a huge technical advantage. In the rescue situation of racing against time, it can quickly establish an effective communication network, lay a solid foundation for follow-up treatment, and protect the life and property safety of the affected people as much as possible.
Military Application of Wireless Sensor Network Technology
Military Application of Wireless Sensor Network Technology
Abstract: information war puts forward the requirements of high timeliness and high reliability for the acquisition of battlefield information. Through the in-depth analysis of the structure and characteristics of wireless sensor networks, it is considered that wireless sensor technology can play a great role in military application fields such as battlefield investigation and monitoring, target positioning, damage effect * estimation, nuclear, chemical and biological monitoring, so as to realize the rapid deployment and control of the battlefield and the real-time acquisition, processing and transmission of battlefield information, so as to greatly improve the battlefield perception ability of the command system, Meet the needs of information acquisition in information war.introductionWireless sensor networks (WSN) is a wireless network composed of a group of randomly distributed micro sensors integrating sensors, data processing units and communication modules. Its purpose is to perceive, collect and process the information of the monitored object in the network coverage area, and transmit it to the information collector. WSN technology integrates sensor technology, embedded computing technology, network technology, distributed information processing technology and communication technology. It has great application value in military, industry, medical treatment, transportation, environmental protection and many other aspects. It is being paid more and more attention by various technical and military powers, and has been published by the technology * theory of the United States Magazine * ranked No. 1 among the 10 emerging technologies that will change the world in the future.Because the detection nodes of WSN can be deployed near the sensing objects by means of aircraft broadcasting or manual arrangement, constantly obtain various information of the sensing objects and provide first-hand information for the decision-making of military commanders, it has broad military application prospects in the form of contemporary information war.The U.S. Department of defense and military research departments attach great importance to WSN technology, and put forward C4KISR plan on the basis of C4ISR, emphasizing battlefield intelligence perception ability, information integration ability and information utilization ability based on WSN technology. As a representative WSN military application research project, "smart dust" and "a line in the Sanel" have also made remarkable research results. The design idea of "intelligent dust" is to scatter thousands of low-cost and low-power ultra micro sensor modules with computing power and wireless communication function on the battlefield and form a network to monitor the enemy's activities, and send the collected original data back to the headquarters after simple processing. "Sand line" is a WSN system developed with the support of the Defense Advanced Research Projects Agency. The system can spread detection nodes throughout the battlefield to detect moving targets with high metal content in the theater. Research institutions in Europe, Germany, Finland, Italy, France, Britain and other countries have also carried out research on the basic theory and military application of WSN technology. Japan and South Korea even promoted the construction of WSN system to the height of national strategy.At present, the research on WSN technology in China has a preliminary scale, but the research on the military application of WSN technology is still in its infancy.1. Composition and characteristics of WSN1.1 composition of WSNA typical WSN system is mainly composed of information management node, sink node, sensor node and related networks.The sensor node is composed of a large number of cheap micro sensor modules deployed near the sensing object. Its purpose is to collaboratively sense, collect and process the information of the sensing object in the network coverage area and send it to the sink node. Each module forms a multi hop ad hoc network system through wireless communication, and the data collected by the sensor node is transmitted to the sink node hop by hop along other sensor nodes. A WSN system usually has a large number of small and low-cost sensor nodes.Sink nodes and sensor nodes constitute the network system for bottom data acquisition and transmission. Although the functions of a single node are limited and the collected data are not accurate enough, a large number of nodes with certain computing capacity, storage capacity and communication capacity cooperate with each other to form a highly survivable network system, and the accuracy and breadth of the collected data have been greatly improved, The returned data can be used as a reference for user decision-making.The sink node transmits the monitoring data to the management node through the communication satellite or other communication network. Through the configuration and management of the whole system, the management node can release the monitoring tasks of each node in the system and collect and process the monitoring data. The typical structure of WSN is shown in Figure 1.1.2 characteristics of WSNWSN has many unique advantages that other information detection systems and network systems do not have, but also has some limitations.1.2.1 advantages(1) Strong survivabilityWSN is densely distributed in the monitoring area. A large number of sensor nodes have equal status, and there is no strict control center. Each sensor node can join or leave the network at any time without affecting the normal operation of the whole network. When some sensor nodes cannot work normally due to environmental interference or man-made damage, a large number of randomly distributed sensor nodes can coordinate and complement each other and dynamically connect into a new network system to ensure that the damage of some sensor nodes will not affect the global task. Therefore, WSN has strong survivability in harsh battlefield environment.(2) High accuracy and reliabilityBecause WSN system can deploy a large number of low-cost sensor nodes in the monitoring area, the sensor nodes can be in close contact with the detection target, which greatly eliminates the impact of environmental noise on the system performance. Through the hybrid application of multiple sensors, the monitoring objects can be monitored from different spatial perspectives while improving the detection performance indicators. The combination of multiple nodes and the synthesis of multi-directional information can effectively improve the signal-to-noise ratio and form a real-time detection area with large coverage area, so as to improve the monitoring accuracy and overcome the technical problems of independent systems such as satellites and radars.Due to the large-scale deployment of sensor nodes in WSN system, WSN usually has high node redundancy, network link redundancy and data acquisition redundancy, which provides strong fault tolerance for the whole system. In addition, adjusting the network topology with the help of individual mobile nodes in the sensor nodes can effectively eliminate the shadows and blind points in the detection area, further reduce the environmental noise and improve the accuracy of detection.(3) Strong self-organization abilityWSN is a peer-to-peer network, each node has routing function, and there is no strict central control node in the network. The deployment of its work does not depend on any preset network infrastructure. After the node is powered on, it can quickly and automatically form an independent network through self-coordination and automatic layout.(4) Strong scalabilityWSN is a dynamic network. Nodes in the network may exit or join the network at any time for various reasons. At this time, the original WSN can effectively accommodate or eliminate the changed nodes, quickly form a new network and continue the original work without external help.
Related Questions of Wire and Cable
Related Questions of Wire and Cable
Considering that Wire and Cable may still be new to many people, we provide ten common questions and answers about Wire and Cable for you to get started.1. Is there a way to guide a bluetooth signal along a wire or a cable?the only way to do it is if theres a wire that can go from your phone to the reciever. You cant direct the signal down a wire2. i don't like the long cable wire in cable internet?If the problem is that the cable is unnecessaryly long, you can go to any electronics store and buy a shorter cable. If you are good at it, you can make it shorter by yourself, just buying the right adapter, cutting the cable and plugging the adapter at the desired distance from the wall. If the problem is the location, perhaps you can move your modem close to the outlet and add a wireless router there. Then your network computers will need a wireless adapter. Notebooks usually come with one.3. whats the sport in canada with snow, you have to jump off a cliff and you glide down a wire cable?It's a Zip Line and you can do it anytime of the year. Snow is not necessarily a requirement4. How to handle unused wire in cableYou should connect one end to GND and let the other end not connected. This way, the signals next to the wire wo not interfere with each other, whilst they would if you would let the wire float.If you connect both ends to GND, you might create a ground loop, which means you get unwanted currents flowing. To reduce interference between the wires of a cable, it's recommend to build cables up like this:5. Could the black and white wires in a three-wire cable both be used as hots?What is happening right now is that the bare grounding wire in the 10/3 feeder cable is being abused as a neutral by someone who clearly did not know any better (as no-grounding-conductor feeders have not been Code for new installs for a while now). You are going to need to re-terminate the cable (and probably use a box to splice some extra length in at one or both ends) and use it properly (black for one hot, red for the other hot, white for neutral, and bare for ground) in order to make this safe and Code compliant.Also, if this is run using 10/3 cable and being fed by a 2-pole 60A breaker, then it's vastly over-breakered, and that breaker will need to be replaced with a 2-pole 30A unit while you are at it with this. There's one last thing I would like to point out, and that's the thing that looks to be a hole in the bottom left corner of the cutout box. That hole should be able to take a 10-32 machine screw and pigtail, which you can then bundle in with the rest of the ground wires to ground the box6. Ethernet wire cable question?Okay couple questions you need to ask yourself. One, what are the model numbers of the modem and router because write now I have to assume your router is wireless only which is rare. Second, what are you trying to achieve, what is the end goal here beyond hooking both devices to your modem directly? Now to the answer. There is no such thing as a split/multi ethernet cable. Networks, like other digital devices, work point to point. You can not split it like an analog audio signal. If your modem supports it you could connect your computer to your modem via USB (if it has one) and Play Station through ethernet. NOT ALL MODEMS SUPPORT THIS AND DOING SO MAY CAUSE SERIOUS DAMAGE TO YOUR MODEM! Google up your Modems model number and check out it's specs to see if it will support this operation first. Also there are modems out there with built in 4 port router/switches you could invest in. Infact, depending on your ISP they may be able to provide you with one.7. Do I need a 3 wire cable between light fixtures?The book is describing a situation where the power is left of the lamps, and the switch is to the right. Further, the book is wrong - you must use 3ground cable between lamp and last switch. Or to be more precise: Since the switch is the first place power goes, you do not need always-hot between switch and lamps, so 2ground cable is appropriate throughout.
GPRS Wireless Transmission Pressure Transmitter, Diaphragm Diffusion Silicon Core
GPRS Wireless Transmission Pressure Transmitter, Diaphragm Diffusion Silicon Core
preface:In the past, wired monitoring scheme was adopted for the detection of air pressure, water pressure and gas pipeline, which was not only difficult to wiring, but also the maintenance cost was higher than the cost of the equipment itself. In order to solve the wiring problem, GPRS network is developed for wireless data transmission.The wireless pressure transmitter is a new industrial transmitter with GPRS wireless network as the core and wireless transmission of pressure data. The wireless pressure transmitter (zwb12xx) adopts industrial explosion-proof shell. In terms of sensor processing, it adopts diaphragm diffusion silicon core for multi-point temperature compensation to realize stable pressure data acquisition and ensure the reliability and accuracy of pressure data.Support the integration of high-capacity disposable 3.6V lithium battery pack or the selection of external power supply; The internal integration of high reliability GPRS network communication module and wireless transmission of pressure data make up for the disadvantage that the traditional pressure transmitter can only transmit data through wired mode (RS485 / 232); The utility model has the advantages of simple construction, real installation and use, convenient maintenance in the later stage, and the battery can be replaced according to the cycle.It has a variety of ranges and can be equipped with local digital pressure display meter: zero point and range are convenient for debugging; Reverse polarity protection and current limiting protection; Lightning and impact resistance; Intrinsically safe explosion-proof; Small size, beautiful appearance and high cost performance; High precision, high stability and high reliability;Why is the wireless liquid level transmitter cost-effective? In the market, the price is as follows:The price of this wireless pressure transmitter is about 800 1000 (the price depends on customization demand).Description of functions and features:>GPRS wireless data bidirectional transmission>Provide additional RS485 serial port>Support Modbus communication protocol>Support automatic heartbeat and stay online forever>Support graphical parameter configuration>Diaphragm diffusion silicon core, digital compensation, ensuring high precision>Real time acquisition and display of liquid level value>Factory integrated high-capacity lithium battery>4-bit LED / LCD digital display, convenient and intuitive>Range setting and adjustment buttons are provided on the panel>Impact resistance, vibration resistance, suitable for industrial site>Support multiple data centers and automatic switching>Compound watchdog technology, never crash>EMC anti-interference design, suitable for harsh electromagnetic environment>Adapt to low temperature and high temperature working environment>Provide flexible DCS, SCADA, configuration software and OPC interfacesNetworking introduction:The structure is shown in the figure below. The zyb12xx of the field acquisition point directly transmits the collected pressure data to the remote server through GPRS network.Technical parameters:Modbous protocol answer:Data monitoring center scheme:Scheme 1: Zhongshan technology provides remote pressure / pressure monitoring system software.The software is a real-time monitoring software developed based on a stable GPRS communication framework independently developed by our company for many years. It is stable and easy to use, supports high-capacity equipment communication and convenient expansion. It has been applied in many industries and achieved good results. We also provide customized development services for specific industries.Scheme 3: OPC or virtual serial port configuration software:Since zyb12xx series pressure transmitter adopts standard Modbus RTU protocol, MODBUS OPC software or virtual serial port provided by Zhongshan technology can be used in the data center to integrate with various configuration software, DCS and SCADA systemsYes. Description of central end software integration interface:(1) The center can use virtual serial port for communication.(2) OPC mode can also be used to realize the general configuration interface.Example of Kingview screen:(3) Easy web access:For some projects, the number of monitoring points is small, and only SMS alarm and viewing real-time data can meet the use requirements. In this case, we can consider using the cloud service provided by our company. We provide a unified query web page or mobile app (Android). Users can buy and use it immediately without deploying their own servers or developing their own software, You can view the transmitter data through mobile phone or computer Internet.
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