Allows to connect rs-485/rs-422 device to your computer via usb port. Stable and reliable prolific pl2303. Real usb 2.0 specification compliant for faster and steadier data communication. Tia/eia rs-485/rs-422 standard compliant. Data transfer rate up to 10mb/s. Transmit distance reach up to 1219m. (the longer distance, the lower rate.) Supports multiple terminals up to 32 rs-485 & 10 rs-422 devices. Supports automatic handshake mode. Supports remote wake up and power management. Auto sense serial signal rate. Zero delay automatic transmit. 600w surge and 15kv static electricity protection. Standard usb type a male and rs-485/rs-422 serial 9 pin male connector with terminal board. Total length: 80mm. Ideal connections to modem, pda, gps, bar code, digitizer, digital camera, label printer & isdn terminal adapter, etc.