• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

RS485 is also commonly used for building automation as the simple wiring configuration and lengthy cable length are ideal for joining remote devices. Manufacturing facilities use serial communication to link their devices together. Access Control Systems: Security systems, including access control panels and card readers, often use RS-485 for communication. Solar Power Systems: Solar power systems use RS-485 for communication between solar inverters, charge controllers, and monitoring devices. This is great for Supervisory Control and Data Acquisition (SCADA) systems where there are many devices and it also comes at a very low cost to implement. This article is a detailed guide to RS485, an essential element in serial communication systems. Rs485 cable is essentially a signal cable with a twisted pair structure, additionally shielded with 2 layers of noise protection used in industrial communication. The design of RS485 is targeted towards it being tolerant and forgiving to noise and long cable runs with the twisted pair cable arrangement. For example, if the data rate is 100 kbps, the maximum cable length is 4000 feet. The maximum number of devices that can be connected to a main cable is 32, including the Master. However, it is important to note that as the length of the cable increases, signal distortion can occur during transmission along the communication line, thereby reducing the maximum data rate that can be achieved.

There are many standards in serial communication and RS485, also known as TIA-485 (-A) or EIA-485, is just one of them. Compared to serial communication, what is rs485 cable USB and ethernet are significantly more complex and expensive. Now, why don’t companies just use USB or ethernet to transmit data between their devices? The equipment located along a set of RS-485 wires are interchangeably called nodes, stations or devices. Serial communication protocols such as RS485, RS232, and Modbus are the backbone of industrial control systems. The foreword to the standard references The Telecommunications Systems Bulletin TSB-89 which contains application guidelines, including data signaling rate vs. This standard is a product of joint efforts by the Telecommunications Industry Association and the Electronic Industries Alliance (TIA/EIA). The most widely used communication standard is RS232. Ultimately, it can be thought of in a way that serial communication is more made for this usage as compared to the common USB and ethernet. However, what if you want to use RS485 in your projects but your device only has USB support? It is like the Universal Serial Bus (USB) or ethernet that we can find in many of our modern computers.

In the straight cable, all noise current is flowing in the same direction, practically generating a looping current just like in an ordinary transformer. RS485 is however most popularly used in programmable logic controllers and factory floors where there are lots of electrical noise. Noise can also be reduced by using common-mode chokes and filters in the communication line. The data transmission rates in serial communication protocols vary depending on the protocol and the application. Modbus can operate at data rates of up to 1 Gbps. Modbus devices communicate using a Master-Slave technique where only one device (the Master) can initiate transactions (AKA queries). This means data can be transmitted in both directions to and fro devices one direction at a time. This means that data can be simultaneously transmitted and received between devices. This whole system allows manufacturing facilities to control their devices remotely and also set-up automation. RS485 is also used in performance venues to control lights and systems such as the one shown below. RS485 is used in many computer and automation systems. Modbus is the world’s most popular automation protocol in the market. RS485 is used as the physical layer for many standards and proprietary automation protocols to implement control systems, most commonly Modbus.

All about RS485 - How RS485 Works and How to Implement RS485 into Industrial Control Systems? It is commonly implemented to control video surveillance systems and link security control panels to devices such as access control card readers. The other devices (the slaves) respond by giving the requested data to the master, or by taking the action requested in the query. However, in a full-duplex setup, they are limited to a master and slave communication where slaves cannot communicate with each other. Serial communication is a way to send data. Serial communication is a method of data exchange utilizing one or two transmission lines, where data is transmitted and received bit by bit in a continuous manner. It is essentially a form of serial communication. RS485 main advantages as compared to other serial communication are tolerance to electrical noise, lengthy cable runs, multiple slaves in one connection, and fast data transmission speed. This includes speed control using Variable Frequency Drives (VFD) or inverters, as well as controlling simple PLC and HMI network systems. A: RS485 communication is commonly used in industrial control systems for various applications, including remote data acquisition, process control, distributed I/O systems, building automation systems, and robotic control.