The Loss of life Of Rs485 Cable And Find out how to Keep away from It > 자유게시판

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And even worse, if you have a non opto-isolated device installed on that network, any noise could "drain" to ground through the device itself instead of flowing through the ground terminal at the end of the line, damaging the device in the process! An RS485 system should ideally consist of a single linear cable (with no branching) with 120-ohm resistors linked across the two wires at each end. Product description: The RS485 communication cable combines the transmission of audio signals with the fixed-laying railway signal, and has excellent anti-interference performance. We have used RS485 communication in many of our previous Arduino Projects and Raspberry Pi projects. If you are interested in knowing how to use RS485 communication between Arduino and Raspberry Pi, you can check out the article. The same way "the customer is king" in the business world, the application is king when choosing which protocol to use. The RS-485 specifies that the cables used as transmission links should be a twisted-pair cable and the data format used is the same as one of RS-232. The diagram below shows potentials of the A (blue) and B (red) pins of an RS-485 line during transmission of one byte (0xD3, least significant bit first) of data using an asynchronous start-stop method.

With Modbus, BACnet and Profibus, A/B labeling refers A as the negative green wire and B as the positive red wire, in the definition of the D-sub connector and M12 circular connector, as can be seen in Profibus guides. The cable used for rs-485 communication is typically a twisted pair, or shielded twisted pair , consisting of two wires, usually 2-wire or 4-wire configurations, which can be either unshielded or shielded to prevent interference. This is the recommended communication cable for all RS485 capable products from Geckodrive. As displayed in the RS485 cable pinout, the interface has all signals in differential configurations. This article mainly covers cable, wiring, pinout, application, and other details about the RS485. Design engineers or buyers might want to check out various Rs485 Cable factory & manufacturers, who offer lots of related choices such as electric cable, electric wire and power cable. The cable is shielded and passes by bus bar at certain points. With multi-drop (many devices on the same bus) and extensive cabling lengths, it's easy to see why the RS485 is so popular in the industrial and automation worlds.

Multiple receivers may be connected to such a network in a linear, multidrop bus. If applications require connecting multiple systems, higher data rates, more noise immunity, and the distance is long, then RS-485 is a more suitable candidate. RS232 is more than able to perform for a short distance and low data speed requirements. In RS-232, no two-wire comparisons are made since data is carried in only one wire and the other wire is a ground reference. This means data can be transmitted in both directions to and fro devices one direction at a time. The Shield is only connected to the earth/ground on one end and provides noise shielding. Engineers are employing it not only for lengthy cabling distances but also in industries such as the automotive industry, where it is unknown what noise will be encountered in the end product. It is designed to transmit data over long distances and in noisy environments. When no data is being transferred, the two transmission lines balance-out, or their voltages cancel each other out. This is necessary to allow long-distance data transmission.

Transmission speed refers to the rate at which data is transferred between devices using the RS485 cable. Because it may be used at high speeds, over long distances, in electrically loud settings, and with multiple devices on the same bus, RS-485 is a good choice for most serial interface applications. The RS485 can be utilized in a variety of applications. RS485 cables serve a crucial role in various industrial and commercial applications. Our Security Solutions was created to provide commercial security products from latest technologies. It may be used to control video surveillance systems or to interconnect security control panels and devices such as access control card readers. RS-485 is designed for multi-point systems, where multiple drivers and receivers are connected and RS-232, on the other hand, is used for connecting only two devices. The trade-off of connecting multiple devices is increased network complexity. RS-485 is also used in theater applications, where a large number of devices are spread out across a large area.