Support SystemSupport the latest operating systems including: Win7, Win8, XP, Vista, Linux, Mac OS. Fully compliant USB 2.0 standard, backward compatible with USB1.1 Wide ApplicationSupport devices with RS485 interface: security cameras, video recorder, fingerprint attendance machine for employees, PBX, CNC machine, SCM, VFD, etc. Fast transmissionAnti-static, anti-jamming, stable performance; baud rate range: 75~115200bsp Easy to use: connect directly to your PC, no external power supply or data cable required Package includes: 2 x USB to RS485 converter adapters Greluma Pack of 2. USB to RS485 Converter Adapter CH340 Chip 64-bit Suitable for Windows 7/8/Vista/MacOS/Linux. Features 1:Anti-static, anti-jamming, stable performance Features 2: No external power supply or data cable required Applications: 1. Highway toll gate, ATM. 2. LED display data communication. 3. Read, write and PTZ control machine PLC data. 4. Central control of household appliances. 5. Access control systems; variety of industrial automation. 6. Instrumentation; employee attendance machine