RS485 Serial to USB adapter enables you to make a stable connection for your PC and RS485 or RS422 device via USB port, no computer freeze, IRQ, DMA or COM port conflict; USB to RS485 converter with FTDI chip supports you the widest possible OS compatibility ( Windows 11, 10, 8, 8.1, 7, Vista, XP, Linux and Mac ); With power, TX and RX LED indicators to check connection and communication activity; terminal block is well-labeled for you to easily wire it to your device correctly; Shielded serial to USB adapter cord supports 600W static surge and 15KV ESD protection to protect devices and ensures safe, high speed data communication; Supports 4 wires RS 422 full duplex, 2 wires RS 485 half duplex; point to point, point to multi-point communication; transmission distance up to 1.2 km (the longer distance, the lower baud rate)