[Introduction]：E810-U21CS is an industrial-grade USB to 2-way RS485 conversion module. With an external USB interface, it can convert to 2 independent RS485 interfaces without affecting each other. It is suitable for scenarios where the computer is connected to multiple RS485 networks at the same time. It has a built-in RS485 automatic transceiver switching circuit and independent pin control switching, making RS485 communication more reliable and allowing more devices to be connected at the same time.