A repeater is a device that connects network lines, and is often used for two-way forwarding of physical signals between two network nodes. The rs485/422 repeater is the simplest network interconnection device. It mainly completes the functions of the physical layer. It is responsible for bit-by-bit transmission of information on the physical layer of two nodes, and completes the functions of signal replication, adjustment and amplification to extend the network. length. So, what are the product functions and application fields of the rs485 repeater? Next, let's follow the editor of Feichang Technology to take a look!
485 repeater product introduction
485 repeater is an optically isolated RS-485/422 data relay communication product, which can extend the communication distance of RS-485/422 bus network and enhance RS-485/422 bus network equipment Number of. The 485 bus can be optically isolated to prevent common mode voltage interference. It can support automatic switching between RS-485 bus and RS-422 bus.
Effectively isolate each serial port and power supply, so that the problem of bus voltage difference is solved, and the hidden trouble of construction quality of RS485 data paralleling is eliminated. Yantong 485 repeater is also specially designed to expand RS485 communication access capability, extend communication distance and flexible and convenient bus networking. It is the best extended networking equipment for point-to-multipoint RS485 networks. It can also be used as RS485 one-to-multipoint RS485 repeater.
485 repeater product characteristics
If the 485 transmission line reaches a certain distance in the 485 bus and is in a complex external environment, it is susceptible to external interference such as electromagnetic induction from the external environment. The high-efficiency anti-detonator in the repeater can effectively suppress lightning and ESD. It also provides 600W lightning surge protection power per line. It can absorb external interference such as electromagnetic induction in the external environment. So as to protect the stability of the 485 bus.
Due to the extension of the 485 bus transmission distance, or the increase of 485 devices in the 485 bus, the 485 signal will continue to attenuate, and finally may cause the 485 bus to be unstable or even unusable. The 485 bus repeater can perform the existing 485 signal. Enhance and enlarge, increase the number of 485 devices in the RS-422/RS-485 bus network.
In the field construction, due to the relatively long distance of the 485 bus, a potential difference is formed in it, resulting in common mode interference, resulting in reduced stability. The photoelectric isolator of the 485 bus repeater can provide an isolation voltage of 3000V, which can effectively isolate the 485 bus from each other and prevent common ground interference. Among them, the DC/DC module can completely isolate the power supply at both ends. So as to achieve complete isolation.
485 repeater adopts professional I/O circuit, uses data flow automatic control technology, automatically distinguishes and controls the data transmission direction, does not need to change the software and hardware, and can easily switch between RS-485 bus and RS-422 bus . With zero delay design, the transmission speed is fast. Automatically detect the serial port signal rate without setting the serial port baud rate.
The 485 bus requires 485 devices to be as close as possible to the bus backbone. Using a 485 bus repeater, the bus topology can be changed to a "T" topology to facilitate on-site construction.
The 485 optically isolated repeater adopts an all-metal shell, which is anti-static and has strong anti-interference ability.
485 repeater applications are
used in point-to-point, point-to-multipoint communication, industrial control automation, road traffic control automation, smart cards, attendance, access control, meal sales systems, industrial distribution systems, closed-circuit monitoring, security systems, POS systems, buildings Automatic control system, self-service banking system.
Medical, industrial and mining product development; industrial control teaching application remote communication; mobile data acquisition station; intelligent building control data, security engineering and other application systems; RS485 bus industrial automation control system.
Well, the above content is the detailed introduction of Feichang Technology on the product features and application fields of the rs485 repeater. I hope it can be helpful to everyone! Feichang Technology , a professional manufacturer of optical transceivers, optical fiber transceivers, industrial switches, and protocol converters, independently researches and develops brands, welcome to come to understand and communicate.