PCI-e one chip solution(OXFORD OXPCIe952) not

USB base solution (Prolific PL2303 chip),

It's real COM Port in your computer, not USB to 

COM port   high compatible with serial type device.

* Fully compliant with ExpressCard Specification 1.0
* ExpressCard/34 Form Factor Module 
* Provides two DB9 RS232 ports
* High speed 16C950 compatible UART controller on-board
* Supports serial transmission rate up to 460Kbps
* On-chip hardware auto flow control to guarantee no data loss
* Built-in 128K byte DMA software FIFO
* No IRQ resource required
* Easy Plug and Play Installation
* Works with various types of RS232 serial devices including modems,
  PDAs, label printers, bar code scanners, digital cameras, and more
* Supports  Windows® 2000, XP, Server 2003 ,Vista, Win7,Win8  and Linux