USB to RS485 Converter Adapter. USB connector: to your PC. RS485 connector: to your RS485 device. No need for external power; powered by the USB port. Fully compliant with the USB 2.0 standard, backward compatible with USB 1.1. NOTICE: Per a notice from the factory, the new batch uses the CH340 chip from Taiwan, which has better compatibility than the CH341 chip. If you have any questions or problems, please feel free to contact us. Thank you for your support! Specification: Dimension: 6.0 x 1.8 x 1.4 cm. Color: Black. Supported Systems: Windows XP, Vista, Windows 7, Linux, macOS, and WinCE 5.0. Supports baud rate range: 75 bps - 115200 bps, up to 6 Mbps. Supports plug and play and hot-swapping (USB side). Better than using the CH341D chip or similar chips to support the laptop USB port. Communication distance up to 1.2 km, with anti-jamming performance for industrial sites. Work temperature range: -40°C ~ +85°C. Communication distance: 1200 m (max). Applications: All kinds of devices with RS485 port parameter settings and data communication. Short distances, such as parameter settings of computer peripheral equipment, using common data lines. Port A of the device connects to port A, and port B connects to port B. Some devices: D+ to A and D- to B. LED display of communication data. Machine PLC data reading and writing. Monitoring data read and write, and PTZ control. Centralized control of household appliances. Access Control System. Card readers. A variety of industrial automation applications. Instrumentation. Parking. Bus fees. Dining halls. Staff attendance. Highway toll stations. ATM machines.