Features: 1.USB 2.0 to RS485: This adapter allows you to easily connect RS485 device directly to a USB port on your laptop or PC. 2.600W Surge Protection: This USB to RS485 converter provides 600W surge protection, which ensures stable transmission. 3.Plug and Play: This USB to RS485 adapter has 0 delay automatic transmit receive switch inside, and I/0 circuit automatically controls the direction of the data flow without any handshake signal, plug and play. 4.Wide Application: This USB 2.0 to RS485 serial adapter is suitable for car computer, industrial instruments, meters, testing equipment, monitoring system, automatic control equipment, mini phone, digital camera, MODEM, ISDN terminal adapter and laptop or PC. 5.Point to Multipoint: This USB to RS485 converter supports point to multipoint, each adapter can be connected to 32 RS485 interface devices. specification:Item Type: USB 2.0 to RS485 Adapter Material: Plastic, Metal Standard: USB2.0 Standard, Downward Compatible. Conform with RS485 Standard USB Signal: VCC DATA+ >3. RS485 Signal: T/R+ T/R- GND Working Mode: Asynchronous, Point to Point or Point to Multipoint, 2 Line Half Duplex Direction Control: Using Data Flow Automatic Control Technology, Automatic Identification and Control of Data Transmission Direction Baud Rate: 300 to 9216000BPS, Automatic Detection of Serial Port Signal Rate. Load Capacity: Support Point to Multipoint, Each Adapter Can Be Connected to 32 RS485 Interface Devices. Transmission Distance: 1.2KM for RS485 Terminal, USB Cable Not Longer Than 5 Meters / 16.4ft. Interface Protection: 600W Surge Protection Power, 15KV Electrostatic Protection. Type of Interface: Type A USB Port with Male Connector and DB9 Male Connector. Transmission Medium: Twisted Pair or Shielded Wire. Transmission Rate: 621600BPS to 300M, 38400BPS to 600M, 9600BPS to 1.2KM Use Environment: Minus 25 to 70, Relative Humidity 5% to 95%. Operating System: Suitable for Win98, for Me, for 2000, for XP, for Vista, for 7. for Linux. for OS X Laptop, for Wince. PackageList:1 x USB2.0toRS485Adapter 1 x Terminal 1 x Driver CD