USB 2.0 USB2.0 to RS-485 RS-422 RS485 RS422 DB9 Serial Port COM Adapter Converter Cable FTDI FT232 FT232R Chipset FTDI FT232R chipset. More stronger and more reliable. Real USB 2.0 specification compliant. TIA/EIA RS-485/RS-422 standard compliant. Support baud rate from 300bps to 912.6Kbps Transmit distance reach up to 1219m. (The longer distance, the lower rate.)