StarTech.com

StarTech.com 2 Port PCIe Serial Adapter Card with 16550

$47.59
The PEX2S553 PCI Express serial card lets you turn a PCI Express slot into 2 RS232 (DB9) serial ports. Based on a native single chip design (no bridge chip), this 2-port serial adapter card allows you to harness the full capability offered by PCI Express (PCIe), and reducing the load applied to the CPU by as much as 48% over conventional serial cards.

The RS232 Serial Adapter Card (PEX2S553) is compatible with a broad range of operating systems including Windows® 2000/XP/2003/Vista™/Windows 7/Server 2008 R2 (32 and 64 bit), Linux Kernel 2.6.11 to 4.11.x, and MAC OS 10.4 and above.

Plus, the serial card includes an optional half-height/low profile bracket that allows the card to be installed in any PCI Express slot, regardless of the size of the computer case.

This product is a replacement for our PEX2S552 card.

Backed by a StarTech.com Lifetime warranty and free lifetime technical support.


  • Native single-Chip, single lane PCI Express
  • 128-byte deep FIFO per transmitter and receiver
  • Selectable power output on pin 9 for the serial port
  • Includes half-height/low profile mounting bracket
  • Compliant with PCI Express base specifications revision 1.0a
  • Two high speed RS232 serial ports with support for data transfer rates up to 460.8 Kbps