485 interface: RS485_A RS485_B . - 485 interface Connectother devices to communicate. Some equipment identification D+ :A D- :B. Standard: USB2.0 standard backward compatible in line with RS485 standard; Direction control: automatic data flow control technology automatic identification and control data transfer direction; Baud Rate :300-9216000bps automatically detect the serial data rate signal; Load capacity: supports multipoint each converter allows connecting 32 RS485 interface device; Interface protection: TVS tube protection USB self-recovery protection; Supports devices with RS485 interface: surveillance cameras video capture device fingerprint attendance machine PBX CNC machine SCM etc. CD: http://m5.img.dxcdn.com/CDDriver/CD/sku.296620.rar