The OKY3406-6 Module is a USB-RS485 converter manufactured by OKYSTAR. It is designed to connect a Universal Serial Bus (USB) and an RS485 serial bus. It uses a CH340G chipset and is compatible with a USB A type connection. This Module has a transmitter, receiver, and port status indicator, as well as a transmission speed up to 300Kbps. The OKY3406-6 module can be used to connect to a variety of devices, such as PLCs, computer networks, and other serial devices. It is a compact unit with an easy installation process and requires only USB power. It is also RoHS- compliant and FCC-approved. This module is a great choice for a reliable connection between a USB and RS485 serial bus.