4 Port PCI Express RS232 Serial Adapter Card with 16950 UART

Add four RS232 serial ports to any PC using a single PCI Express expansion slot

Product ID: PEX4S950

  • UART’s fully compatible with 16C550 type devices
  • high performance 16C950 UART channel
  • Fully Compliant with PCI Express Base Specifications, Revision 1.0a
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  • Supports 4 RS232 over one single PCI Express Slot
  • Includes both Full and Low profile brackets for use with Slim and Micro systems


This PCI Express Serial Adapter card can be installed into any PCI Express slot on a computer, to provide four high performance 16C950 RS232 serial UART channels/ports - a convenient solution for connecting modern or legacy serial devices with support for data transfer rates of up to 460 Kbps.

The serial adapter card is easy to install, with support for Windows® 2000, XP, 2003 and Vista. Plus, the card features IRQ sharing and supports plug and play serial device connections, guaranteeing convenient, hassle-free installation.

The 4 Port PCI Express 16C950 Serial Card is backed by StarTech.com’s lifetime warranty and FREE LIFETIME tech support.

The StarTech.com Advantage

  • Backward compatible with 16C450, 16C550, 16C650 and 16C750 UARTs
  • Data transfer rates of up to 115 Kbps for peak serial device performance
  • Easy to install and use with full step-by-step instructions
  • Package includes both the full and low profile brackets for use with slim and micro POS systems


  • Casino (video lottery terminals, slot machines)
  • Consumer (modems, PDAs, digital cameras, printers)
  • Environmental Control (lighting, temperature, clocks)
  • Healthcare (patient monitoring equipment, nurses' stations, modems)
  • Hospitality/Restaurant (credit card/debit card reader, serial printers)
  • Hotel Front Desk (serial printers, bar code scanners, keyboard, mouse, receipt printer, credit/debit card reader)
  • ISDN Networking
  • Manufacturing (CNC machinery, process control equipment, bar code scanners, serial printers)
  • POS (credit/debit card readers, receipt printers, bar code scanners, cash registers, scales)
  • Security (UPS control, access key panels, video cameras, card readers, modems)

Technical Specifications

Warranty Information
Warranty Lifetime
Bus Type PCI Express
Card Type Standard Profile
Chipset ID PLX/Oxford - OX16PCI954
Interface Serial
Port Style Integrated on Card
Ports 4
FIFO 128 Bytes
Maximum Data Transfer Rate 115.2 Kbps
Serial Protocol RS-232
Connector Type(s) 1 - PCI Express x1 Male
External Ports 4 - DB-9 (9 pin, D-Sub) Male
OS Compatibility Windows® 8 (32/64bit), 7 (32/64), Vista(32/64), XP(32/64), ME, 98, 95
Humidity 5~95% RH
Operating Temperature 0°C to 55°C (32°F to 131°F)
Storage Temperature -40°C to 75°C (-40°F to 167°F)
Physical Characteristics
Cable Length 11 in [280 mm]
Product Height 4.7 in [12 cm]
Product Length 6.2 in [15.7 cm]
Product Width 0.8 in [20 mm]
Weight of Product 10.9 oz [309 g]
Packaging Information
Package Height 1.7 in [42 mm]
Package Length 9.1 in [23 cm]
Package Width 6.5 in [16.5 cm]
Shipping (Package) Weight 0.9 lb [0.4 kg]
What's in the Box
Included in Package 1 - PCI EXPRESS CARD


View full OS compatibility
Windows® 8 (32/64bit), 7 (32/64), Vista(32/64), XP(32/64), ME, 98, 95