RS 485

Confused About Serial Ports/UART/RS-232/RS-485? Understand All the Differences in 3 Minutes! (Embedded Classroom)

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Confused About Serial Ports/UART/RS-232/RS-485? Understand All the Differences in 3 Minutes! (Embedded Classroom)

A serial port (COM port) is a general term, UART is a protocol, and TTL/RS-232/RS-485 are voltage standards. Data using the UART protocol is transmitted through TTL (board-level short distance), RS-232 (± voltage anti-interference), or RS-485 (differential long distance multi-device) voltage standards, while COM port is the name given by Windows to this type of … Read more

The Impact of Protection Circuit Capacitance on RS-485 Signal Quality

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The Impact of Protection Circuit Capacitance on RS-485 Signal Quality

The RS-485 bus is widely used in industrial environments, which may experience high levels of electrostatic or surge interference. Engineers typically use gas discharge tubes and TVS diodes to build protection circuits. However, the capacitance of these circuits can be high, and improper application may affect communication. This article will introduce a low-capacitance peripheral circuit. … Read more

Working Principles, Performance Characteristics, and Application Scenarios of Common Communication Methods RS-232 and RS-485

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Working Principles, Performance Characteristics, and Application Scenarios of Common Communication Methods RS-232 and RS-485

In the field of industrial communication and device connectivity, RS-232 and RS-485 are two commonly used serial communication standards. Their working principles determine their respective performance characteristics, which in turn affect their applicability in different scenarios. Below, we will explore the differences between the two in terms of transmission speed, anti-interference capability, and communication distance … Read more

Why Must Profibus Buses Have Termination Resistors? Understanding the Key Principles!

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Why Must Profibus Buses Have Termination Resistors? Understanding the Key Principles!

In industrial communication, Profibus is a widely used fieldbus protocol, and termination resistors are crucial for its stable operation. Many engineers encounter issues such as unstable communication and data loss during debugging, often due to improper configuration of termination resistors. So, why must Profibus have termination resistors? How should they be configured correctly? This article … Read more

Complete Technical Analysis of 51 Microcontroller and PC Serial RS-485 Communication: What You Should Know

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Complete Technical Analysis of 51 Microcontroller and PC Serial RS-485 Communication: What You Should Know

In various fields such as industrial control and smart home systems, communication between devices is a key aspect of achieving system functionality. The RS-485 bus, with its strong anti-interference capability, long transmission distance, and multi-node communication advantages, has become a widely used serial communication standard. The 51 microcontroller, as a classic entry-level microcontroller, can achieve … Read more

In-Depth Analysis of RS-232 and RS-485: Working Principles, Performance Characteristics, and Application Scenarios

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In-Depth Analysis of RS-232 and RS-485: Working Principles, Performance Characteristics, and Application Scenarios

In the field of industrial communication and device connectivity, RS-232 and RS-485 are two commonly used serial communication standards. Their working principles determine their respective performance characteristics, which in turn affect their applicability in different scenarios. Below, the editor from Wuhan Liyoude will delve into the differences between the two in terms of transmission speed, … Read more

Detailed Explanation of MODBUS RTU Communication for Mitsubishi FX5

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Detailed Explanation of MODBUS RTU Communication for Mitsubishi FX5

MODBUS RTU Communication Settings for Mitsubishi FX5 MODBUS RTU communication falls under the category of serial communication. The MODBUS serial communication function of the FX5 can control 32 slave devices when using RS-485 communication and can control 1 slave device when using RS-232C communication. In practical applications, the choice between RS-485 and RS-232 mainly depends … Read more

Unveiling the Core Mechanism of RS-485 Communication: The Key Role and Implementation Principle of 120Ω Termination Resistors

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Unveiling the Core Mechanism of RS-485 Communication: The Key Role and Implementation Principle of 120Ω Termination Resistors

Common “Difficulties” in the Field One of the most troublesome issues during device debugging: RS-485 communication is unstable, with intermittent data transmission. The program logic is fine, the cable connections are correct, and there are no address conflicts, yet communication timeouts, data corruption, and sporadic failures still occur. Changing cables, adjusting baud rates, and checking … Read more

The Golden Partner of RS-485

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The Golden Partner of RS-485

‖ System Learning Life is like a marathon; sometimes you need to pause and take a breather to go further. Why does Modbus RTU always appear with RS-485? What is RS-485? Before we dive into this issue, let’s first understand what RS-485 is, which you may have heard of but not fully grasped.In official terms:RS-485 … Read more

Relationship Between USB Transfer Rates and RS-232/RS-485 Serial Protocol Rates

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Relationship Between USB Transfer Rates and RS-232/RS-485 Serial Protocol Rates

1. Technical Background RS-232: Traditional serial port standard, typical rate 115.2 kbps (maximum about 1 Mbps). RS-485: Industrial serial port standard, typical rate 10 Mbps (theoretical maximum can reach 50 Mbps). USB: There are significant differences between different versions, for example: USB 2.0:480 Mbps USB 3.0:5 Gbps (about 5120 Mbps) USB 4.0:40 Gbps 2. Comparison … Read more