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Item#: N82E16815158164

StarTech 4 Port Native PCI Express RS232 Serial Adapter Card with 16950 UART Model PEX4S952

  • PCI Express to Serial Port Card

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the STARTECH PEX4S952




PCI Express to Serial Port Card
External USB Ports
PCI Express
External Ports
4 x Serial Ports
Operating Systems Supported
Windows 2000, XP (32-bit, 64-bit), Vista (32-bit, 64-bit)


128-byte deep FIFO per transmitter and receiver
Automated in-band software flow control using programmable Xon/Xoff in both directions
Automated out-of-band hardware flow control using Tx/Rx/RTS/CTS/DSR/DTR/DCD/RI/GND
Compliant with IEEE1284, SPP/EPP/ECP parallel port
Compliant with PCI Express base specifications revision 1.0a
High Performance Dual Channel Oxford 950 UART
Native single-Chip, single lane PCI Express
Selectable power output on pin 9 for the serial port
Two high speed RS-232 serial ports with data transfer rate up to 460.8 Kbps

Dimensions & Weight

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 0 day
  • Read full details

Customer Reviews of the STARTECH PEX4S952

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  • Ethan H.
  • 4/20/2011 7:13:04 AM
  • Ownership: 1 month to 1 year

5 out of 5 eggsWorks well

Pros: Works like a champ. Added 4 RS232 ports to a Win 2008 R2 x64 server used to control test and measurement equipment. CPU usage dropped by 50% vs. using the motherboard serial ports. No communication problems, and the board supplies plenty of power to equipment that needs it.

Cons: Minor quibble: Windows does not provide a means of predetermining which serial port corresponds to each physical output. It took some experimentation to figure out what COM port connected to each output from the card. After swapping assigned port numbers, it is possible to get the COM port sequence aligned with the card outputs; e.g. COM3->Output 1, COM4->Output 2, etc.

Other Thoughts: We bought this card from a different vendor, as the Egg was out of stock.

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  • Ken V.
  • 5/17/2010 6:00:03 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs

Pros: I installed this card on an XP machine and it installed and worked as one would always hope. No problems, no issues.

Cons: NONE

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  • Edward B.
  • 2/12/2010 2:57:46 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsWorks with Ubuntu

Pros: Works out of box with Ubuntu 9.04. no driver required!

Cons: Build quality not super great, but works fine

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  • Mr. R.
  • 9/29/2009 5:03:30 PM
  • Ownership: 1 day to 1 week

5 out of 5 eggsWorks great in Linux

Pros: Works perfectly in Linux. Running Ubuntu 9.04 (Jaunty) 64-bit, kernel 2.6.28. I just put the card in, booted the machine, the kernel detected the card automatically during boot, and ttyS0-3 are now in my /dev directory. Minicom and a loopback adapter verify that each port works fine. Couldn't be simpler.

Cons: D-sub retention screw doesn't quite line up with connector, but can be made to fit without much difficulty.

Other Thoughts: The card uses the OXPCIe954 chipset, which appears to be supported automatically under the current version of Ubuntu. The 2-port and 8-port variants are also supported. Other manufacturers' chipsets may not enjoy such automatic kernel support, as I've discovered.

Also, there is a 4-pin Molex (+5/12V) connector on the card, but you don't need to attach anything to it to make the card work. That's probably for supplying power to some external device if one were to make a custom cable harness for the high-density D-sub connector.

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Item#: N82E16815158164
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