1. Protocol Reverse Engineering Record (Wireshark Capture Code) # Wireshark filter rule (key fields marked in red)tcp.port == 102 && cotp && s7comm /* Typical handshake message structure 0000 03 00 00 16 11 e0 [TSAP:0x0100] [TSAP:0x0101] 00 00 00 01 00 c0 01 0a |_________| |___| |_____________| |_____________| |_TPKT_| |_COTP_| |S7C| */ #pragma pack(1) … Read more
1. Communication Protocol Mismatch The communication between the PLC and the host computer requires the use of the same communication protocol. If the protocols do not match, the PLC will be unable to accept commands from the host. It is essential to ensure that the communication protocols are consistent and correctly configured. 2. Incorrect Communication … Read more
ClickFollow“PLC Wireless Communication” for daily amazing discoveries! Is RS-232 a standard communication interface or a protocol?? Is RS-232 a bus?? What is the relationship between fieldbus and networks?? Does each bus have a protocol?? What is the main function of the PLC communication module?? It’s all a mess, please advise, thank you. Whoever can explain … Read more
1. Different Paths, Same Goal RS-232, RS-422, and RS-485 all belong to UART, which stands for Universal Asynchronous Receiver/Transmitter. They can complete communication using just two signal lines (Rx and Tx); However, due to the different voltage levels used by each, converting from UART to RS-232, RS-422, or RS-485 requires a conversion chip like the … Read more
LoRaWAN (Long Range Wide Area Network) is a communication protocol specifically designed for Low-Power Wide-Area Networks (LPWAN) suitable for Internet of Things (IoT) applications. It uses LoRa modulation technology and operates in specific unlicensed frequency bands globally, according to the regulations of different countries and regions. Below are the main LoRaWAN frequency bands used in … Read more
MQTT: IoT Device Communication Protocol Stack Around us, more and more smart devices are quietly changing our lives. Have you ever wondered what happens behind the scenes when you use a mobile app to turn on the smart bulb at home? Today, let’s explore the “delivery guy” of communication between IoT devices – the MQTT … Read more
Click the blue text to follow Servo and Motion Control 1. The Origin of CANopen, Where Did CANopen Come From? The CAN protocol was developed by the German company Bosch in 1983 for network communication in automotive transmission systems. It later became the international standard ISO11898, and currently, CANopen is drafted and reviewed by the … Read more
Click on the topElectrical Engineering Learning, follow and star it A professional self-media in the field of electrical engineering, don’t miss it Imagine a DC power supply with three pins on its output socket: positive, negative, and ground. Correspondingly, the load’s plug should also have three pins that match the power supply, so that energy … Read more
Follow us for more learning resources! About Us: Qicheng Automation Training, China’s leading industrial robot training service provider. Training Programs:Robotics + PLC System Integration + Motion Control + Robotics + Machine Vision The Modbus protocol is arguably the most widely used communication protocol in the field of industrial automation. Its openness, expandability, and standardization make … Read more
Click the ” Technical Training ” above and select “Pin to Top Public Account“ 160,000+ industrial control professionals follow this WeChat platform: Technical sharing, learning exchange, industrial control videos Description: Now I will explain the application of MODBUS. Currently, most communication between the upper and lower machines in industrial control uses the MODBUS communication protocol, … Read more