modbus tcp protocol

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Does the web point-to-point program transmit data using the HTTP protocol or TCP/IP protocol?

The web point-to-point program transmits data, is the HTTP protocol or TCP/IP protocol TCP/IP protocol and HTTP protocol what is the difference, two Web program point-to-point transmission data, you will choose that one. Today

Some views on TCP/IP protocol (2): TCP protocol

The above describes the overall architecture of the TCP protocol, today introduces the TCP protocol's famous three-time handshake and four-time handshake.The server and client must establish a connection before communicating, which is done through three handshakes, thus ensuring the reliability of the communication.The steps for the three-time handshake are as fo

About the HTTP protocol and TCP, IP protocol in the end in the network protocol hierarchy.

Protocol, we have determined to send the data content, we put this data in a buffer, and then formed the application layer of the message data.Transport LayerThis data is sent through the transport layer, such as the TCP protocol. So they will be sent to the transport layer processing, where the message is punched in the header of the transmission head, mainly i

MTU-TCP/IP protocol stack-linux kernel-tcp packet loss retransmission-UDP high performance-ai-

http://view.inews.qq.com/a/20161025A0766200QQ in narrowband eraQQ is a narrow band of the most representative of the product, in that network transmission efficiency is lower than the era, we still remember Google's homepage? Why is the simple page of Google so concise?Google was born in 1998, is also in the narrow-band era, you will find its home byte size is less than 1024, why less than 1024 bytes, because the Ethernet MTU (that is, the largest transmission unit) is 1024,google in order to le

Some views on the TCP/IP protocol (3): Slip protocol and PPP protocol

, otherwise the receiver believes that the data frame is not finished, that is, two consecutive ESC Only one of them is processed.The SLIP protocol is not applicable because of the following reasons:1. Serial line can only run one protocol (only slip), but not to run other protocols2. Large data transfer increases network congestion3. Cannot pass IP to the other end (no source IP bit in the frame)4. Cannot

HTTP protocol, TCP protocol, IP protocol, DNS service before the relationship and differences

There has been a problem for a long time, everyone is talking about the HTTP protocol, TCP protocol, IP protocol, what is the difference between them, what is the use, no one told me, recently read this "illustrated http" understand some of the film from the bookFirst, understand a transmission stream to expandFor exam

TCP/IP Study Notes (3)-IP protocol, ARP protocol, RARP Protocol

Transfer http://blog.csdn.net/goodboy1881/article/details/668556 ------------------------------------------------------ Put the three Protocols together for learning because these three protocols are on the same layer. ARP is used to find the MAC address of the Ethernet NIC of the target host, and the IP address carries the message to be sent. The data link layer can get the data transmission information from ARP, and get the data information to be transmitted from the IP address.1. IP

TCP/IP Detailed learning notes (3)-IP Protocol, ARP protocol, RARP protocol

Put these three protocols together because the three protocols are on the same level, the ARP protocol is used to locate the target host's Ethernet NIC MAC address, and the IP hosts the message to be sent. The data link layer can get the data transfer information from ARP, and the data to be transmitted from IP.1.IP protocolThe IP protocol is the core of the IP protocol

Analysis of TCP/IP layer-4 protocol system and tcpip layer-4 Protocol

Analysis of TCP/IP layer-4 protocol system and tcpip layer-4 Protocol TCP/IP layer-4 protocol system 1) The link layer, also known as the data link layer or network interface layer, usually includes the device driver in the operating system and the network interface card co

TCP/IP Protocol Learning Five (UDP protocol)

UDP belongs to the transport layer together with the TCP mentioned earlier. UDP differs from TCP in that it is a non-connection-oriented protocol, that is, when both parties communicate with each other, they do not need to establish a connection beforehand. So the UDP header saves a lot of fields, and the UDP header is only 8 bytes. The UDP header consists of th

C # Read and write Omron (Omron) PLC, C # Read and write data using the FINS-TCP protocol

interface, you can add group consultation, if there are better suggestions, welcome to put forward.Complete information about the components and other API descriptions refer to: The Http://www.cnblogs.com/dathlin/p/7703805.html component's authorization protocol, the update log, all within the page.This article will show you how to configure the network parameters and how to use the code to access the PLC data, hoping to give the people in need to so

Use Wireshark to analyze the formats of TCP headers in TCP/IP protocol

Abstract: This article briefly introduces TCP connection-oriented theory, describes the meaning of each field of TCP packets in detail, and selects TCP connections from the wireshark capture group to establish relevant packet segments for analysis. I. Overview TCP is a reliable connection-oriented transmission

[Switch] Use Wireshark to analyze the format of TCP headers in TCP/IP protocol

Tags: blog HTTP Io use AR strong data SP Art This article briefly introduces TCP connection-oriented theory, describes the meaning of each field of TCP packets in detail, and selects TCP connections from the wireshark capture group to establish relevant packet segments for analysis.I. Overview TCP is a reliable connect

Go The difference between TCP/IP protocol and UDP/IP protocol

TCP (transmission Control Protocol, transmission Protocol) is a connection-oriented protocol,In other words, a reliable connection must be established with each other before sending or receiving data.A TCP connection has to be three "conversations" to build, and the process

The difference between TCP protocol and UDP protocol

TCP the difference between protocol and UDP protocol first, let's get this straight. TCP agreements and UCP Agreement and TCP/IP agreement, a lot of people are confused, has always been said TCP/IP Agreement and UDP the differenc

TCP/IP Detailed learning notes (9)-TCP Protocol Overview

Finally saw the TCP protocol, which is the most important and the most exciting part of the TCP/IP details, to spend great effort to read. In front of TFTP and BOOTP are some simple agreement, do not write notes, write up nothing. TCP and UDP are in the same layer---transport layer, but

TCP/IP Detailed learning notes (9)-TCP Protocol Overview

Finally see the TCP protocol, this is the TCP/IP detailed inside the most important is the most exciting part, it will take great effort to read. The previous TFTP and BOOTP are simple protocols, no notes, no writing. TCP and UDP are at the same level---transport layer, but TCP

The linux OSI Layer-7 model, TCP/IP protocol stack, and the structure of each layer reveal big secrets. The osi protocol stack

The linux OSI Layer-7 model, TCP/IP protocol stack, and the structure of each layer reveal big secrets. The osi protocol stack When I learn Linux, I know the OSI model even if I am a little cute. What ?! You don't know !!! Okay, this secret is taken away. Thank you ~~~ I,Two protocols (1OSI protocol model (layer-7) In

Standard Internet communication protocol-TCP/IP protocol

Today, let's talk about the standard Internet communication protocol-TCP/IP protocol.This part of content may not be very understandable and abstract. It is a tough nut for beginners, but since it is a beginner, don't let everyone have any mental burden. No one is a genius, right? I will try my best to give you more examples for your understanding!1. Basic ContentTCP/IPTransmission Control

HTTP protocol and TCP protocol simple understanding

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, while the HTTP protocol corresponds to the application laye

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