1. Synchronous and Asynchronous Transmission 1.1 Concepts and Examples Using everyday examples to illustrate what synchronous and asynchronous mean: Synchronous: A friend calls to say they are coming to my house for dinner, and I wait for them at home. Asynchronous: A friend arrives at my house unexpectedly without prior notice. The difference lies in … Read more
Over 70,000 friends have followed the industrial control WeChat platform:Technical sharing,Learning exchange,Industrial control videos Solutions to RS485 Communication Port Damage in Siemens S7-200 PLC: 1. Internal RS485 Interface Circuit Diagram of S7-200 PLC: In the diagram, R1 and R2 are ordinary resistors with a resistance of 10 ohms, which serve to prevent excessive current from … Read more
1. What Is Communication To understand RS485 communication, we first need to clarify what communication is. In fact, communication is the transmission of 0 and 1 codes between two devices, where 0 represents low level and 1 represents high level. If device A transmits data to device B, then device A and device B must … Read more
RS485 communication is a commonly used communication method in the industry, widely applied with a simple circuit. Below is a circuit diagram of the 485 interface: This image is one I found online; it is a commonly used circuit. Although many people use it this way and I haven’t heard of any issues, I believe … Read more
Click the image above to follow “Changxue Electronics” for easy learning of electronic knowledge. Changxue Electronics Subscription Account Daily updates on technical articles in the electronics industry and the latest information on microcontrollers for easy learning anytime, anywhere. 1. Signal Reflection Issues During communication, when there is an impedance mismatch or discontinuity, signal reflection occurs, … Read more
1. Signal Crosstalk Crosstalk refers to the coupling phenomenon between two signal lines. Due to the close spatial distance, there will be unwanted inductive and capacitive coupling between the signal lines, leading to mutual interference. Capacitive coupling can cause coupling currents, while inductive coupling can cause coupling voltages. This is a tricky issue in circuit … Read more
We see that this touchscreen serial interface has RS485 as well as RS232. Here, we will briefly explain and distinguish between the serial interfaces RS485/RS232/RS422. RS232:Is a three-wire communication (1 transmitting wire, 1 receiving wire, and 1 common wire which is the reference ground GND). RS422:Is a four-wire communication (1 for transmitting +, 1 for … Read more
Search on WeChat Technical Training Preparation Required hardware: Mitsubishi FX3G PLC, RS485 communication module (FX3G-485BD), one Inovance inverter, touch screen (MT6071IP). Required knowledge: PLC communication protocol, command sending, inverter communication parameter settings. Wiring The wiring is quite simple. Insert the FX3G-485-BD module into the PLC, short SDB and RDB, short SDA and RDA. Connect the … Read more
Difference Between RS232 and RS485 Interfaces 1. Physical Structure of the Interface 1. RS232 Interface One of the computer communication interfaces, typically the RS-232 interface appears in the form of 9 pins (DB-9) or 25 pins (DB-25). Generally, personal computers have two sets of RS-232 interfaces, referred to as COM1 and COM2. 2. RS485 RS485 … Read more
Before discussing RS485 communication, it is necessary to mention RS232 communication. If you are not familiar with RS232 communication, don’t worry. You have definitely seen and used the RS232 interface (if you don’t believe it, you can check behind your desktop computer at home). In fact, many people use the Siemens PCPPI programming cable to … Read more