scada protocols

This article compares the transmission performance of five communication protocols, including RMI, Hessian, Burlap, Httpinvoker, and web service, in different data structures and data volumes. RMI is a remote communication protocol provided by the java language. It is stable and efficient and is the basis of EJB. However, it can only be used for communication between JAVA programs. Hessian and Burlap are open source

1. Network Transmission: physical layer, data link layer, network layer, transmission layer, Session Layer, presentation layer, and Application Layer 2. Transmission Unit: transmission unit of the physical layer: Data bit stream (BITs) and data link layer transmission unit: data frame) Transmission unit at the network layer: Packet and transmission unit at the transmission layer: Message) The transmission unit at the Session Layer: Message and the transmission unit at the presentation layer: Mes

What is a license agreement?What is license? When you issue a license for your product, you are transferring your rights. However, you still have copyrights and patents (if you have applied for a license). The purpose of the license is, provide certain permissions to users who use your product.Whether the product is distributed to the public for free or sold, it is very useful to develop a license agreement. Otherwise, for the former, you give up all your rights, no one is obligated to express y

The most basic concepts in network programming are connection-oriented (connection-oriented) and non-connected (connectionless) protocols. In essence, the difference between the two is not difficult to understand, but for those who are just beginning to network programming, it is a very confusing problem. The problem is somewhat related to the context: Obviously, if two computers are to communicate, they must be "connected" in some form, what does "no

From: http://blog.jobbole.com/74795/ Some time ago I made a development, involving network programming, and the development process was quite smooth, but I always felt a bit confused after the task was completed. The main reason is that you are not familiar with network protocols and are not clear about some concepts. Later, I spent some time learning about these network protocols. Now I have a preliminary

Objective-C Protocols, objective-c Objective-C Protocols 1.1 Formal Protocols A formal protocol (like an informal protocol) is a named list of methods and properties. Formal protocol (like informal protocol) is a list of names of a series of methods and attributes. However, a formal protocol requires that you explicitly adopt it. Formal protocol requires you to e

Various computer communication protocols: L Protocol: behavior and specification in Network Communication L protocol three elements: 1. Syntax: the sender sends data according to certain rules 2. Semantics: the recipient's computer can read the received information. 3. timed relationship: After receiving the message, you must send a response to the recipient. Common network protocols: 1. netbe

Common network protocols in browsers In fact, browsers need to deal with various network protocols to complete various WEB application functions. HTTP is only one of them. This article describes common network protocols in browsers and their relationships. We often hear the term "TCP/IP protocol". Literally, some people think that it refers to both TCP and IP

IPsec is designed to solve some basic security problems of IPv4. To solve these problems, it implements four services: Data Transmission encryption, data integrity verification, data source authentication, and data status integrity. To implement these services, IPsec VPN introduces many protocols. In this article, you will learn how to implement the IPsec security protocol. Fifteen years ago, VPC was a new concept for most enterprises. However, today,

There was no clear concept of open-source protocols before, and I always thought that open-source is free or even free of charge. I spent a day reading open-source protocols a few days ago. Common Open Source protocol analysis Let's have a look at 'open source! Common Open Source protocols Sun shot GPL open source Protocol Open source protocol list I also read so

Network protocols are the foundation of the Internet. Therefore, we need to understand network protocols in many ways and from multiple perspectives. Because of the large number of network protocols, each protocol has its own functions and functions. Next we will introduce several key network protocols. Key network

The relationship between the network level protocol and the structure system between the LAN and the Internet communication is completed with the support of different network levels and network level protocols. So what are their definitions and functions? How can we locate the protocol, structure, system, and hierarchy? Next, let's take a few more details. 1. Several Basic concepts in a hierarchical architecture (1) Protocol is a communication Protoco

Introduction to TCP/IP and other network protocols 1. TCP/IP is a communication protocol for the Internet. Computer Communication Protocols are descriptions of the rules that computers must comply with in order to communicate with each other. TCP/IP refers to the Transmission Control Protocol/Internet Protocol (Transmission Control Protocol/Internet Protocol ). TCP/IP defines how electronic devices (such as