Estoreimport @ Hexin USB 2.0 to Rs422 Rs-422 Rs485 Converter Adapter Serial Win7 64 Mac Pl-2303 Hexin USB 2.0 to RS422 RS-422 RS485 Converter Adapter Serial Win7 64 Mac PL-2303 USB to RS485-422 converter comes with the following advantages: to realize the communication between the RS485-422 device and the host computer that does not have RS232 serial port (for example, Laptop) to increase the transmission rate during RS485 or 422 communication, as USB transmission rate can be up to 10Mbps USB port can supply strong power need for the converter.