It is the interface card of the PCI conformity which expands the RS-232C serial communication port of one channel in a personal computer. It can mount also in a standard PCI slot by bracket (appending) change. UART162850 of 128byte FIFO is carried according to each channel and transmission and reception. It can be used as a Windows and standard COM port for Linux by the setup by the attached standard COM driver. A program is also possible at a Win32 API communication function or MSComm.