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Add Four RS232 Serial Ports to an Embedded System through a mini PCI Express Slot

The MPEX4S952 4-Port RS232 Mini PCI Express Serial Card (16650 UART) turns a mini-PCIe slot into four RS232 (DB9) serial ports with data rates up to 921.6 Kbps - a cost-saving solution for adding serial support to embedded systems missing the functionality.

A native PCIe single-chip design enables you to take advantage of full PCI Express bus capability, by providing improved speed and reliability while reducing the load applied to the CPU by as much as 48% over conventional "bridge chip" serial cards .

Backed by a Lifetime Warranty and free lifetime technical support.


  • Add serial ports to industrial embedded computers and systems
  • Add RS232 serial control to an embedded or slim media center/media server/all-in-one PC
  • Add RS232 serial ports to slimline POS systems

The Advantage

  • The smallest form factor available, for internally adding serial ports to any embedded system
  • Native single-chip design means up to 48% less load on your CPU which is critical for small embedded PCs that use low power, low MHz CPUs


Warranty Information
Warranty Lifetime
Bus Type Mini PCI Express
Card Type Embedded
Chipset ID ASIX - MCS9904CV-AA
Industry Standards PCI Express Base Specification, Revision 1.1
Interface Serial
Port Style Dongle (Included)
Ports 4
Data Bits 5, 6, 7, 8
FIFO 256 Bytes
Flow Control None, Xon/Xoff, RTS/CTS
Max Baud Rate 921.6 Kbps
Parity None, Odd, Even, Space, Mark
Serial Protocol RS-232
Stop Bits 1, 1.5, 2
Connector Type(s) 1 - Mini PCI Express x1 (52 pin) Male
External Ports 4 - DB-9 (9 pin, D-Sub) Male
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 4.11.x LTS Versions Only
Humidity 5~95% RH
Operating Temperature 0¡C to 55¡C (32¡F to 131¡F)
Storage Temperature -20¡C to 85¡C (-4¡F to 185¡F)
Physical Characteristics
Color Green
Product Height 1.2 in [3 cm]
Product Length 2 in [51 mm]
Product Width 0.4 in [10 mm]
Weight of Product 5.3 oz [150 g]
Packaging Information
Package Height 1.6 in [40 mm]
Package Length 8.3 in [21.2 cm]
Package Width 5.7 in [14.5 cm]
Shipping (Package) Weight 0.4 lb [0.2 kg]
What's in the Box
Included in Package 1 - 4 Port Mini-PCIe Serial Card
4 - DB9 ribbon cable
1 - Driver CD
1 - Instruction Manual
Barcode # 65030844611
Brand Startech
Shipping Weight 0.1900kg
Shipping Width 0.100m
Shipping Height 0.050m
Shipping Length 0.210m
Shipping Cubic 0.001050000m3

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StarTech 4 Port RS232 Mini PCI Express Serial Card w/ 16650 UART MPEX4S552

Model # MPEX4S552

  • SKU: MPEX4S552

In Stock

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