MERRY CHRISTMAS Technicians often encounter the problem: why can’t my touchscreen communicate with the PLC? For example, the following two issues: 1. The Weintek touchscreen cannot communicate with the Siemens PLC, it keeps prompting that the PLC has no response. What should I set? Solution approach: Make sure to set the same baud rate, the … Read more
Hello everyone, good evening~ Today is still a technical article! Siemens Modbus RTU Communication: S7-200 smart Modbus RTU Master Communication (√) S7-200 smart Modbus RTU Slave Communication (√) RS485/232 Communication Ports and DP Connector Connection Methods S7-1200 Modbus (RTU) Instruction V3 Basic Functions S7-1200 Modbus (RTU) Instruction V4 New Functions Each S7-200 SMART CPU provides … Read more
This article is an excellent piece from the KX forum, authored by KX forum user ID: blck四 In my usual research on binary vulnerabilities and kernel issues, I have found answers on KX, and I am very grateful to these predecessors for sharing their problem-solving ideas, which helps future generations avoid pitfalls. Device Information and … Read more
Search on WeChat Technical Training RS485 interfaces are composed of half-duplex networks, generally using two-wire systems, often employing shielded twisted pairs for transmission. This wiring method allows for a bus topology structure, which can connect up to 32 nodes on the same bus. Initially, data was output as analog signals for simple process quantities, and … Read more
In non-standard automation projects, Modbus communication failures are one of the most troublesome issues for engineers. Sudden device disconnections, abnormal data transmission, communication timeouts… These problems not only affect production efficiency but can also lead to the shutdown of the entire production line. After years of practical experience, we have summarized this 5-minute quick troubleshooting … Read more
Comparison and Analysis of Embedded System Communication Protocols In embedded system development, these six major communication protocols each have their strengths: UART, with its simple and user-friendly characteristics, is often used for short-distance (1m) debugging communication between MCUs and sensors; RS232 achieves a stable 15m connection with host computers through level conversion chips, making it … Read more
In the process of learning embedded systems, serial communication is undoubtedly a very important and fundamental method for communication and debugging. During this learning process, many different concepts related to serial communication have been encountered. This article will distinguish and analyze the concepts of serial ports, UART, USART, RS485, and RS232. 1. Basic Concepts of … Read more
RS232: Asynchronous transmission standard interface. Typically, the RS-232 interface appears in the form of 9 pins (DB-9) or 25 pins (DB-25). Using a DB-9 9-pin connector, transmission employs shielded twisted pair cables, utilizing only three wires for sending data, receiving data, and signal ground. RS485: A standard that defines the electrical characteristics of drivers and … Read more
Understanding MODBUS Communication in One Article We have a laser distance meter with a measurement range of 0-300mm, which outputs data via RS485 communication in actual value format. Data is collected using the FX5U Mitsubishi PLC and displayed on a Weintek HMI. Next, let’s look at how to implement 485 communication in the FX5U. Based … Read more
1. Overview of RS232 and RS485 RS232 and RS485 are two widely used serial communication standards in industrial control, data acquisition, communication devices, and the Internet of Things (IoT), used for data exchange between devices. RS232, as a classic point-to-point communication standard, is suitable for short-distance, low-speed scenarios; RS485, with its multipoint communication and long-distance … Read more