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Item#: N82E16815158015

StarTech Value 4 Port 16550 Serial PCI Card Model PCI4S550N

  • PCI to Serial Port Card
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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The PCI4S550N 4-port PCI Serial card turns an available PCI slot into four RS232 serial ports - a cost-effective solution for connecting any new or old serial peripheral, with support for data transfer rates of up to 115Kbps.

The PCI Serial card is a perfect solution for connecting serial modems, POS devices, PDAs, digital cameras, printers, ISDN terminal adapters and more, to your system without having to upgrade your peripheral devices for compatibility with newer standards (e.g. USB).

Saving time and hassle, the Serial PCI card is plug-and-play ready, and can be installed in minutes, supporting Windows 7, Server 2008 R2, Vista, XP, ME, 2000, 98, 95, NT4, 3.1, DOS and Linux operating systems. Plus, the serial card offers IRQ sharing to help ensure stability and consistent performance, guaranteeing convenient, hassle-free connections.

  • newegg Broad Compatibility The StarTech PCI4S550N is compatible with any PC running Windows, DOS or Linux for simple installation into your application.
  • newegg High Performance The StarTech PCI4S550N delivers data transfer rates up to 920 Kbps for peak serial device performance.
  • newegg Easy Installation Full step-by-step instruction ensures a hassle free serial solution.

Learn more about the STARTECH PCI4S550N




PCI to Serial Port Card
External Ports
4 - DB 9-pin Serial Male
Operating Systems Supported
Linux and all versions of Windows

Physical Spec

4.72" x 2.91"
7.2 oz.


16 byte FIFO buffer ensures fast data transfer while multitasking
Easy plug and play installation fits an open PCI slot using Windows 95/98/ME/2000 or XP
Includes drivers for Linux and all versions of Windows
IRQ sharing saves resources and eliminates conflicts
Supports the RS-232 serial interface

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

Manufacturer Warranty

1 year limited
1 year limited

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year

Customer Reviews of the STARTECH PCI4S550N

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  • Anonymous
  • 8/9/2011 12:38:31 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsGreat Cards

Pros: Has worked great for years on XP systems as well as Windows 7 Pro.

Cons: None that I've seen

Other Thoughts: I use these cards on observatory computers controlling serial connections to mounts, rotators, focusers, dew heaters and the like. As most computers no longer come with native serial ports these cards are needed as many telescope accessories require serial ports. Using USB to Serial converters don't always work, are limited in length of run without repeaters, and will end up costing more. Some computers use 1 - 4 port card while others have required two. I've yet to have one fail. The diver may not be the easiest to locate if you don;t pay attention but they have worked each and every time.

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  • Jim F.
  • 3/21/2009 10:08:07 AM
  • Tech Level: High
  • Ownership: less than 1 day

1 out of 5 eggsWindows XP / XPMCE

Pros: None

Cons: The INF files both shipped and from the manufacturers site are invalid and will not install. Tested this on 2 XP and an XP-MCE system thinking the OS may have had a problem, which turned out not to be the case.
$50 paperweight - avoid this one.

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  • James B.
  • 10/25/2006 7:41:30 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsSpeed rating is misleading

Pros: Easy installation and works well up to 115200 baud.

Cons: If you actually need high speed operation (over 115200 baud) under windows 2000, XP, or 2003, then this is not the card. The drivers as written will not allow operation over 115200 baud! I contacted technical support from StarTech about this and did get a quick reply - however they stated this was windows limitation - which is simply not correct.

0 out of 1 people found this review helpful. Did you? Yes No

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Computer Hardware > 
Computer Accessories > 
Add-On Cards > 
Item#: N82E16815158015
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