modbus tcp protocol

TCP/IP protocol family 1.1 Introduction The TCP/IP protocol family consists of 5 layers: Physical layer, Data link layer, network layer, Transport layer and application layer. The first four layers correspond to the first four layers of the OSI model, providing physical standards, network interfaces, Internet connect

Tcp Transmission Control Protocol (Transmission Control Protocol), which is an available to the user processThe full duplex byte stream is a connection-oriented protocol. TCP provides reliable and error-free data transfer between two computers.When an application uses

Computer network refers to the different geographic locations of multiple computers with independent functions and their external devices, through the communication lines connected together,Under the management and coordination of network operating system, network management software and network communication protocol, the computer system of resource sharing and information transmission is realized.Network Programmingis the data exchange between progr

In C # writing code, many times you will encounter the HTTP protocol or TCP protocol, here is a simple understanding.The TCP protocol corresponds to the transport layer, and the HTTP protocol corresponds to the application layer,

What is the TCP.IP protocol? Generally speaking, TCP/IP protocol is the Technology foundation of Internet based on TCP/IP protocol (Transmission Protocol/Inter-network protocol). Full n

parameter problem (theIP header field is wrong), and the routing (change of path) is changed. 1.3.2. QueryThis is primarily used for loopback requests and responses (judging whether they are reachable), timestamp requests, and questions and answers (time synchronization) in both cases.1.4. ICMP Example1.4.1. PingDetermine if the destination host is reachable.1.4.2. TracertDisplays the routing path to which the destination host will pass.2.TCP(Interne

differencein the network communication, TCP is similar to making a phone call, in this way for network communication, you need to establish a dedicated virtual connection, and then perform reliable data transmission, if the data sent failed, the client will automatically resend the data. and the UDP Way is similar to sends the text message, uses this way carries on the network communication, does not need to establish the specialized virtual connectio

IP: Internet Protocol Unreliable: IP datagram cannot be successfully delivered to the destination, and only the best transmission service is provided. No connection: the IP address does not maintain any status information about subsequent datagram. The processing of each datagram is independent of each other. IP Header The header length of a common IP address is 20 bytes, unless it contains an option field. Included fields: 4-bit version, 4-bit head

Socket is used when learning Java, but I still don't understand what is going on. There is no foundation for computer networks. I found some information everywhere. A rough summary of the useful information is provided to facilitate a deeper understanding in the future. For more information, see. I. Differences between the Tup protocol and the UDP protocol TCP-th

HTTP, FTP, SMTP, Telnet, etc. protocol, Oh! That HTTP protocol is the protocol that's used to access the Web. Actually ... You know, we should understand him from the reality, understand the function and function of the network protocol, and then from the fundamental point of view he is concrete how to achieve. We can

1. IntroductionIP is the most central protocol in the family of TCP/IP protocols. All TCP, UDP, ICMP, and IGMP data are transmitted in an IP datagram format. IP provides unreliable, non-connected datagram delivery services.(1) unreliableIt does not guarantee that IP datagrams will successfully reach their destination. IP only provides the best transport service.