Isolated industrial serial ports on USB connect RS-422 and RS-485 devices,
used in industrial environment. With RS-485 the data direction is controlled by
the port, without further action from the software.
The high speed serial port with the 128 byte FIFO allow high speed
communication, even in heavy loaded systems. Unique features reduce the system
load. The serial port also allows unusual speed settings like 500.000bps.
