This product is an isolated micro converter for converting the USB port of PC into RS-422A/485 serial communications. Each converter has one channel RS-422A/485 communication port. Higher noise-resistant models with isolation between a PC and bus line as well as a surge protection circuit for communication ports. This product supports a baud rate of up to 921,600bps and has separate 128-byte / 384-byte buffer memory for transmit and receive. It also comes with a Windows driver, which allows boards to be used as OS-standard COM ports.