scada protocols

http://blog.jobbole.com/84429/TCP HTTP UDP:is the communication protocol, that is, the rules of communication, only the two parties in accordance with this rule "speak", the other party can understand or serve.The relationship between TCP HTTP UDP three:TCP/IP is a protocol group, which can be divided into four levels: network interface layer, network layer, Transport layer and application layer.At the network layer are IP protocols, ICMP

The WAN protocol is relative to the LAN protocol, and the Internet can be identified as a wide area network. Then the relevant agreement is well understood. is inseparable from the OSI model. Here are a few typical protocols. To everyone as a reference. The WAN Protocol is a three-tier operation at the bottom of the OSI Reference Model, which defines communication on different WAN media. Mainly used for wide area network communication

With the development of the Internet in China, the connection between ISP service providers and Internet is also changing. On a network connection, from a single connection to the Internet via multiple telecommunications companies, in terms of routing protocols used, from the use of static routing protocols to the use of BGP (Border Gateway Protocol). How does the ISP deploy the BGP routing protocol rationa

Source: The blog of the Green Snow ClubTCP HTTP UDP:is the communication protocol, that is, the rules of communication, only the two parties in accordance with this rule "speak", the other party can understand or serve.The relationship between TCP HTTP UDP three:TCP/IP is a protocol group, which can be divided into four levels: network interface layer, network layer, Transport layer and application layer.At the network layer are IP protocols, ICMP

We use the Internet every day. Have you ever wondered how it is implemented? Billions of computers around the world are connected together and communicate with each other. One Network Card in Shanghai sends a signal, and the other network card in Los Angeles actually receives the signal. The two actually do not know the physical location of the other. Do you think this is amazing? The core of the Internet is a series of protocols, called Internet Prot

uses similar authoritative protocols, such as Web Hypertext Transfer Protocol (HTTP) formatting and Simple Mail Transfer Protocol (SMTP) email protocols-evolved and evolved into a new and powerful standard. However, although SIP uses its own unique user proxy and server, it does not work in an integrated manner. SIP supports integrated multimedia services and works with a large number of existing

1. Introduction Digital video transmission is a communication method that people use vision to obtain information. Compared with other information transmission methods, digital video transmission is accurate, intuitive, and efficient. Due to the large amount of information transmitted by digital videos and limited bandwidth, the compression and encoding of videos, selection of transmission channels and network protocols, and IP multicast technology

languages. By using source code and documents, you can understand the architecture of the entire software and the implementation methods of a specific function. Object Code refers to the object code generated after the source code is compiled, similar to the "class library". It provides various interfaces for others to use. According to my understanding, it is something like common DLL, ActiveX, OCX controls. (I don't know if this is correct) The purpose of these two concepts is to make it clea

and other multimedia information, as a package protocol, IP addresses seem a little inadequate: Long latency and not a fixed value. packet loss leads to discontinuous signals and high distortion. To solve these problems, the vendor provides several solutions: the first solution is based on the priority of different objects, and some devices are mostly multimedia applications.) data packets can be uploaded first. The second scheme is based on the protocol priority. You can define which Protocol

HTTPS protocols: TLS, SSL, SNI, ALPN, PNP, snialpn HTTPS is now widely used. It brings security while introducing more complicated concepts to the Web. This includes a series of network protocols that have never been seen before. Now, based on the principle of HTTPS, Harttle tries to interpret these protocols in the most popular way. HTTPS Overview HTTPS is an H

Why are we always talking about router protocols? For the construction of a network, the use of the router protocol is directly related to the various performance and indicators of the network. So this is very important. With the complexity of the network structure, the use of a single Router Protocol can no longer meet the needs. Therefore, there will be a variety of router protocols in a network, so how t

First, the summaryThis paper compares the transmission performance of 5 kinds of communication protocols such as Rmi,hessian,burlap,httpinvoker,web service in different data structures and different data volumes. RMI is the Java language itself provides the communication protocol, stable and efficient, is the basis of EJB. However, it can only be used for communication between Java programs. Hessian and burlap are open-source

infrastructure or central device. In this system, all nodes can be moved randomly, and can maintain contact with other nodes, that is, each mobile node acts as both a router and a terminal at the same time. When two user terminals cannot communicate directly, communication is usually achieved by means of the routing function of other nodes ｡ The routing protocol is the basis for communication between mobile nodes in the Ad-hoc network. It also directly affects QoS and security of communication

The legendary WCF (1): Is this hard to learn?The legendary WCF (2): What about service agreements?Legendary WCF (3): multiple protocolsLegendary WCF (4): send and receive SOAP HeadersLegendary WCF (5): data protocols ()Legendary WCF (6): data protocols (B)Legendary WCF (7): "one-way" "two-way"Legendary WCF (8): Play with message protocolsLegendary WCF (9): stream and file transferLegendary WCF (10): messag