The RS485 hub can realize the expansion of 1-way RS485/RS232 to 4-way RS485, and connect multiple RS485 devices (such as sensors, controllers, displays, etc.) to the same bus system through the hub. It can expand the scope of the communication system, support more equipment interconnection, reduce signal interference and signal attenuation, improve communication stability and transmission efficiency. This series of products are designed according to industrial standards, with power isolation, signal isolation, lightning protection and anti-static design, stable and reliable.