What is RS-485 Hub?

Time : Oct. 19, 2022    View : 46

What is the rs485 hub

The RS-485 hub is the RS-485 bus split concentrator (485 hub) specially designed to solve the large system requirements of the RS-485 bus in the complex electromagnetic field environment. It can provide a more flexible RS-485 star bus structure RS-485 interface input and output are all driven independently, changing the single structure of the original bus to a star network structure, which can improve the stability of engineering construction and system to great benefit.

 

 The rs485 hub usually provides various types of interfaces, such as RJ45 interface, BNC interface, AUI interface, and phoenix terminal interface, among which RJ45 interface and phoenix terminal interface are the most common. Under special circumstances, optical fiber interfaces and other types of interfaces can also be customized according to customer needs. When the hub is connected to the device, it may encounter different interfaces. At this time, we can use the interface converter to realize the conversion between various interfaces.

16 ports rs485 hub

How does rs485 hub work

It works on the second layer of the OSI reference model, the “data link layer”. The hub is mainly designed with the goal of optimizing the network wiring structure and simplifying network management. A hub (HUB) is the smallest unit that centrally manages the network. Like the trunk of a tree, it is the gathering point of each branch.

 

RS485 hub features

Wide temperature and wide voltage: The working temperature of the product can reach -40~85℃, and the working voltage is DC 9-30V.

Industrial-grade photoelectric isolation: Provide photoelectric isolation of more than 3KV for all RS-485 interfaces, effectively solving the transmission problems caused by external lightning surges and ground potential differences.

Fault isolation: It has the function of port fault detection, and automatically isolates the faulty port, which can ensure that when the RS485 device on one of the branches fails, the corresponding port will be isolated to ensure that the devices on other ports work normally.

Signal amplification: Amplify the received RS485 signal, extend the transmission distance, and enhance the anti-interference ability.

 

RS485 hub installation

The most important thing about an access device is its interface type, and different interfaces are used in different application environments. The installation of the hub is relatively simple, just fix it in the wiring cabinet and connect the signal cable and power supply cable according to the product instructions. No additional software configuration is required.

 

RS485 hub working process

The working process of the hub is very simple. It can be briefly described as follows: First, the control host sends a command signal, and the hub receives the command signal. Because the command signal is attenuated in the cable transmission, the hub reshapes the attenuated command signal after receiving the command signal. Amplify, and finally, the hub broadcasts the amplified command signal to all other ports; after the corresponding RS485 device receives the command from the control host, it parses the command, performs the corresponding operation, and then returns the operation result to the control host.

 

In order to solve the problem of large-scale deployment of RS485 bus under complex electromagnetic environments, Hangzhou Feichang Technology has specially designed an RS485 hub, which is widely used in intelligent transportation, instrumentation detection, intelligent parking lot, intelligent parking, automation control and other fields, and each port has independent optical isolation, short-circuit, open-circuit protection functions, and the port alarm indication can quickly determine the fault point, and can reliably ensure communication security during use.