It's real COM Port in your computer, not USB to COM port
high compatible with serial type device.
FEATURES
* 4 independent RS-232 serial ports with communication speeds up to 430Kbps
* Designed to meet PCI-Express Base Specification Revision 1.1
* Supports x1,x2,x4,x8,x16（lane）PCI-Express Bus connector keys
* High speed 16C1050 compatible UART controller on-board
* On-chip hardware auto flow control to guarantee no data loss
* Built-in 16 byte hardware FIFO & 256K byte DMA software FIFO
* Support DOS,Linux,MAC,Microsoft Windows 2000/XP/2003/Vista and Win7
