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StarTech 4-port PCI Express RS232 Serial Adapter Card - PCIe Serial DB9
SKU# AC39315, Model# PEX4S953


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SKU # AC39315 | Model # PEX4S953 | Brand StarTech

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4 port DB9 serial controller card w/16950 UART using ASIX AX99100 w/bi-directional RS232 speeds up to 921.6Kbps per port; avail. 256 byte FIFO and 9th data bit | Upgraded version of our popular Serial card PEX4S952 - PCI Express RS232 serial adapter card w/power output of 12v/5v/none on DB9 pin 9 w/up to 2A - Expansion card pre-installed w/standard bracket (1x low profile bracket incl); DB44 to 4x DB9 breakout cable incl. - Windows XP and up/Linux - PLCs/automation/scanner - Lifetime warr.

Manufacturer Warranty: Limited Product Lifetime Warranty
Manufacturer Contact Info: http://www.StarTech.com.au,
Rating: 4.0 stars - 77 reviews

· Maximum Compatibility
· Experience Optimal Technology
· Base PCI Express 1.1 compliant


This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot, as if they were native serial ports. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps. 

Maximum Compatibility 

With broad OS support, including for Windows and Linux, this multiport PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-sized bracket, and includes an optional low-profile bracket, so installation is easy regardless of the case form factor. This expansion card is a direct replacement for PEX4S952.  

Experience Optimal Technology 

This PCIe to serial adapter supports the following features: 

  • Industry standard 16950 UART compatible 
  • Supports max baud rate of up-to 921.6Kbps 
  • Provides 5/12V power output on Pin 9 when external power is connected 
  • 256-byte depth FIFO cache per transmitter and receiver 
  • Supports 9, 8, 7, 6, 5 data bits (one per port) 
  • Asix AX99100 chipset 
  • Base PCI Express 1.1 compliant 

The Choice of IT Pros Since 1985    

StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales.  

PEX4S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support. 

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Connector Type(s) PCI Express x1 Male
External Ports DB-9 (9 pin, D-Sub) Male
Internal Ports LP4 (4 pin; Large Drive Power) Male Input
Humidity 5~85% RH
Operating Temperature -10°C to 80°C (14°F to 176°F)
Storage Temperature -20°C to 100°C (-4°F to 212°F)
Bus Type PCI Express
Card Type Low Profile (SP bracket incl.)
Chipset ID Asix AX99100
Interface Serial
Port Style Integrated on Card
Ports 4
Packaging Information
Package Height 5 cm [2 in]
Package Length 21 cm [8.3 in]
Package Width 15 cm [5.9 in]
Shipping (Package) Weight 371 g [13.1 oz]
Data Bits 5, 6, 7, 8, 9
FIFO 256 Bytes
Flow Control None, Xon/Xoff, RTS/CTS
Max Baud Rate 921.6 Kbps
MTBF 214,358 hours
Parity None, Odd, Even, Space, Mark
Serial Protocol RS-232
Stop Bits 1, 1.5, 2
Physical Characteristics
Cable Length 30 cm [11.8 in]
Product Height 1.5 cm [0.6 in]
Product Length 7.5 cm [3 in]
Product Width 6.3 cm [2.5 in]
Weight of Product 50 g [1.8 oz]
Description CDW 75 - 1st Line StarTech.com 4-port PCI Express RS232 Serial Adapter Card - PCIe Serial DB9
Microsoft WHQL Certified Yes
OS Compatibility Windows® 7, 8, 8.1, 10
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016
Linux 2.4.x to 2.6.x LTS Versions only
Special Notes / Requirements
Note Selectable power output on pin 9 of the serial port
What's in the Box
Included in Package 4 Port Full Profile Serial Card
  Break-out Cable
  Low Profile Bracket
  Quick Start Guide


SKU # AC39315 | Model # PEX4S953

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