StarTech.com

StarTech.com 2 Port Low Profile PCI Express Serial Card - 16550

$44.19

The PEX2S553LP low profile/half-height PCI Express Serial Card turns a PCI Express slot into two RS232 (DB9) serial connections.

The card is constructed using a native single chip design that lets you harness the full capability offered by PCI Express (PCIe), while reducing the load applied to the CPU by as much as 48% over conventional bridge chip serial cards.

The PCI Express RS232 Serial Adapter Card 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 ships with a low profile/half-height bracket installed but includes an optional full profile bracket that lets you add 2 serial ports to virtually any computer (regardless of the case form factor).

This product is a replacement for our PEX2S552LP card.

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


  • Selectable power output on pin 9 for the serial port
  • Compliant with PCI Express base specifications revision 1.1a
  • Native single-chip, single lane PCI Express
  • Single chip design optimizes speed and reliability
  • Ships with half-height/low profile mounting bracket, includes optional standard profile bracket
  • One high speed RS232 serial port with data transfer rate up to 460.8 Kbps