The PEX4S553 4-Port Native PCI Express RS232 Serial Adapter Card with 16550 UART lets you add 4 RS232 (DB9) serial ports, using a single PCI Express expansion slot.

Based on a native single-chip design, this 4-port serial adapter card allows you to 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 RS232 Serial Adapter Card includes 4 half-height/low-profile brackets, allowing the card to be installed into almost any PC case, regardless of form factor.

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

The StarTech.com Advantage
Native single-chip, single lane PCI Express chipset delivers true PCIe performance, up to 48% more efficient than bridge chip designs
Standard and low profile/half-height brackets included to ensure fitment in any system
Warranty Lifetime
Hardware
Bus Type PCI Express
Card Type Standard Profile (LP bracket incl.)
Chipset ID ASIX/MosChip - MCS9904CV-AA
Interface Serial
Port Style Integrated on Card
Ports 4
Performance
Data Bits 5, 6, 7, 8
FIFO 256 bytes
Max Baud Rate 128 Kbps
Parity 5, 6, 7, 8
Serial Protocol RS-232
Connector(s)
Connector Type(s) 1 - PCI Express x1 Male
External Ports 4 - DB-9 (9 pin; D-Sub) Male
Software
Microsoft WHQL Certified Yes
OS Compatibility Windows® 8 / 8.1 (32/64), 7 (32/64), Vista (32/64), XP (32/64)
Windows Server® 2012, 2008 R2, 2003
Mac OS® 10.10
Linux
Physical Characteristics
Color Green
Product Height 0.7 in [19 mm]
Product Length 4.7 in [120 mm]
Product Weight 2.8 oz [80 g]
Product Width 5.1 in [130 mm]
Environmental
Humidity 5~85% RH
Operating Temperature 0?C to 50?C (32?F to 122?F)
Storage Temperature -20?C to 60?C (4?F to 140?F)
Packaging Information
Shipping (Package) Weight 0.5 lb [0.2 kg]
What's in the Box
Included in Package 1 - 4 Port PCI-Express RS-232 Serial Card
1 - Bracket with 2 DB9 male ports
4 - Low Profile Brackets
1 - Driver CD
1 - Instruction Manual