The RS-485 bus is widely used in communication, industrial automation, and other fields. In practical applications, one often encounters the question of whether to add pull-up and pull-down resistors and what resistance values are appropriate. Below, we will conduct a detailed analysis of these issues. 1. Why are Pull-Up and Pull-Down Resistors Needed? According to … Read more
Connecting Inverters’ PU Interface to Computers with RS-232C Interface Since most computers do not come with RS-485 interfaces, and many computers are equipped with RS-232C interfaces (serial ports, also known as COM ports), an RS-232C to RS-485 interface converter can be used to connect computers with RS-232C interfaces to the PU interface.
These communication standards play different roles in industrial automation. Let me use a traffic system analogy to help you understand: Basic Positioning of the Four Standards 1. RS-232: A One-to-One Small Road Features: The earliest serial communication standard (1969) Point-to-point full-duplex communication (simultaneous two-way) Single-ended signal transmission (susceptible to interference) Typical transmission distance ≤ 15 … Read more
Serial interfaces are primarily used for serial bit-by-bit data transmission, allowing for bidirectional communication with just a pair of transmission lines, which offers the advantages of simple communication lines and low costs. Nowadays, many serial data interfaces are used in specific fields, with common examples including I2C, CAN, LIN, SPI, Flex, MOST, and I2S. Of … Read more
The RS-485 interface forms a half-duplex network, typically using a two-wire system with shielded twisted pair transmission. This wiring method allows for a bus topology structure, enabling up to 32 nodes to be connected on the same bus. Initially, data was output as analog signals for simple process quantities, and later, the RS-232 interface was … Read more
Source: 21ic Electronics Network Original Author: Na Luo Mi Mi A microcontroller (单片机) is an integrated circuit chip that combines a central processing unit (CPU) with data processing capabilities, random access memory (RAM), read-only memory (ROM), various I/O ports, an interrupt system, and timer/counter functions into a single silicon chip, forming a compact and complete … 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
Industrial Control Classroom Industrial Control Classroom【www.gkket.com】Essential website for engineers Add WeChat:gk-auto Join WeChat group Electrical Automation – Free Materials Worth Over Ten Thousand Click to Download for Free (DownLoad) Serial communication is the most basic communication method faced by electrical engineers, and RS-232 is the simplest among them. Many beginners often confuse UART with RS-232, … Read more
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Serial communication is the most basic communication method faced by electronic engineers, with RS-232 being the simplest among them. Many beginners often struggle to understand the relationship and differences between UART, RS-232, RS-422, and RS-485. This article will discuss the understanding of these concepts to help clarify their relationships. If we compare serial communication to … Read more