USB to RS485 Converter Adapter USB connector: to your PC RS485 connector: to your RS485 device No need external power, powered by USB port Fully compliant USB 2.0 standard , backward compatible with USB1.1 NOTICE: Per the notice from factory, the new batch uses chip CH340 from Taiwan which with more compatibility than CH340 Chip, if you have any question or problem, please feel free to contact us, thanks for your support! , Specification: Dimension:6.0 x1.8x1.4cm Color: Black Support System: Windows XP , Vista, Windows 7 , Linux , MacOS , and WinCE5.0 drive Supports baud rate range : 75bps - 115200bps , up to 6Mbps Supports Plug , Play and hot-swap ( USB side) ; Better than using CH341D chip or similar chip to support the laptop USB port . Communication distance up to 1.2KM, with anti-jamming performance of industrial site ; Work temperature range: -40°C ~ +85°C Communication distance :1200m(max) Applications: All kinds with RS485 port device parameter settings , data communication Short distance , such as parameter settings of the computer peripheral equipment , the use of common data lines can be . A and A port of the device when the wiring is connected , B and device B connected . Some devices D + A and D, - B . LED display of communication data Machine PLC data reading and writing Monitoring data read and write , and PTZ control Centralized control of household electrical appliances Access Control System ; card A variety of industrial automation ; instrumentation Parking ; bus fees Dining Hall ; staff attendance Highway toll station; ATM machine