StarTech 4 Port PCIe Serial Adapter Card with 16550

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

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
MTBF 
26,280 Hours
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® DOS, 95, 98SE, 2000, CE 5.0/6.0, Embedded System 2009, POS Ready 2009, XP Embedded, XP, Vista, 7, 8, 8.1, 10
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016
Mac OS® 10.4 to 10.10
Linux 3.5.x to 4.4.x LTS Versions Only

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)

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