StarTech PEX4S553B 4 Port PCI Express Serial Card

The PEX4S553B 4-Port PCI Express Serial Card (with breakout cable) lets you add 4 RS232 serial ports using a single PCIe expansion slot, with an included 1-to-4 cable enabling you to add 4 serial ports to a single low profile slot. The serial card features a native single-chip design that provides optimum reliability and speed, reducing the CPU load by up to 48% over conventional bridge-chip serial cards - a cost-effective solution for connecting legacy serial devices to PCIe-enabled computers. The multi-port serial adapter includes both full profile and low profile/half-height brackets for compatibility with standard and small form factor computers, and is compatible with a broad range of operating systems, including Windows®, Linux, and MAC OS. This product is a replacement for our PEX4S552B card. Backed by a StarTech.com lifetime warranty and free lifetime technical support.

The StarTech.com Advantage

- Lower CPU load of native single-chip, single lane PCI Express design ensures optimal system performance (up to 48% less CPU load)
- Includes both standard and low profile/half-height brackets, which makes this the perfect card for any application, including small form factor embedded applications
- Breakout cable design means that only one expansion slot is needed, to add 4 additional serial ports to any system

Hardware

Bus Type 
PCI Express
Card Type 
Low Profile (SP bracket incl.)
Chipset ID 
ASIX/MosChip - MCS9904CV-AA
Interface 
Serial
Port Style 
Dongle (Included)
Ports 
4

Performance

Data Bits 
5, 6, 7, 8
FIFO 
256 Bytes
Max Baud Rate 
230.4 Kbps
Parity 
Even, Odd, None, Space and Mark
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 70°C (32°F to 158°F)
Storage Temperature 
-40°C to 85°C (-40°F to 185°F)

Included in Package 
1 - 4 Port PCI-Express Serial Card
1 - Breakout cable
1 - Full profile bracket
1 - Driver CD
1 - Instruction Manual