The fundamental basis of data communication in today’s IP networks is the TCP/IP reference model. Today, we will use a PC to access a WEB server to deeply understand the TCP/IP reference model. As the article is quite lengthy, it is recommended to save it for later reading. TCP/IP Reference Model Computer Network: Simply put, … Read more
Click the blue text to follow us PROFIBUS (Process Field Bus) is a widely used communication protocol in the field of industrial automation. It was developed by Siemens in the early 1980s and standardized in the 1990s. PROFIBUS enhances the level of automation in industrial production by enabling efficient and reliable communication between devices. 1.Development … Read more
The TCP/IP protocol specifies that the minimum frame length for transmission is 64 bytes; any frame shorter than 64 bytes is considered invalid. So, how was this 64 bytes determined? This can be traced back to the CSMA/CD protocol. As is well known, early Ethernet operated on a shared bus, where multiple computers were connected … Read more
1. Design Philosophy of Modbus Protocol Modbus devices communicate using a master-slave (client-server) architecture, where only one device (the master/client) can initiate transactions (referred to as queries). Other devices (slave/server) respond by providing requested data or performing operations as requested in the query. Slaves are any peripheral devices (I/O converters, valves, network drives, or other … Read more
Article Summary This article analyzes twisted pair Ethernet using a mixed-signal oscilloscope as the analytical tool, delving into the encoding of two common types of twisted pair Ethernet. It also examines and verifies the signal transmission of Ethernet at the physical layer, concluding with a practical example comparing the data received by software in an … Read more
The Data Link Layer Has Three Purposes: To send and receive IP datagrams for the IP module. To send ARP requests and receive ARP responses for the ARP module. To send RARP requests and receive RARP responses. Everyone has heard of IP. As for ARP and RARP, ARP stands for Address Resolution Protocol, which is … Read more
Basic Concepts of Ethernet Before performing Ethernet communication, it is necessary to understand several basic concepts of Ethernet communication, such as IP address allocation, PC network address and settings, etc. Allocating IP Address If the programming device (such as PC) connects to the factory LAN (or the Internet) using a network card, then the programming … Read more
This chapter mainly introduces the MODBUS TCP communication protocol and the content of free format communication protocols. 1. Overview of MODBUS TCP Communication MODBUS TCP combines the Ethernet physical network and the network standard TCP/IP with MODBUS as the application protocol standard for data representation. MODBUS TCP communication messages are encapsulated in Ethernet TCP/IP packets, … Read more
Introducing the setup of the TP-Link wireless router. The demonstration is based on a brand new router. If you are unsure whether the router has been configured previously, it is recommended to reset the TP-Link wireless router. The correct method to reset the TP-Link wireless router: While the router is powered on, press and hold … Read more
Author | Tianrongxin 1. Overview EtherCAT (Ethernet for Control Automation Technology) is a real-time industrial fieldbus communication protocol based on Ethernet, originally developed by Beckhoff Automation GmbH in Germany. It was introduced to the market in 2003, became an international standard in 2007, and became a national standard in China in 2014. The emergence of … Read more