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PCIe Serial Card, 1-Port RS232 w. low profile

  • Model: SD-PEX15021


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Many newer motherboards now have PCIe slots instead of the older standard PCI slots, so if you need to add serial RS232 COM ports to your desktop computer then this PCIe serial card is the best way to do it.
Using a PCIe serial card is often more reliable way of creating a serial port and provides better performance than using a USB to serial adapter. The reason is that the PCIe card is connected directly to the PCIe slot on the motherboard which gives the drivers a more direct way of communicating with the port, whereas when using a USB to serial adapter the drivers works on a higher level requiring more resources which results in higher latencies, data delays and electrical noise which eventually can result in a higher error rate.

This PCIe card adds one high-speed 9-pin serial RS232 COM port to any PCIe-equipped PC. It uses an all-in-one high quality chipset solution (MCS9922) from MosChip Technology which provides superior performance and unmatched serial PCIe data transfer rates.

The created serial port share same IRQ which saves valuable resources if other expansion cards are used.
The drivers will automatically configure the next available serial PCIe COM port and IRQ address within Windows. The COM port number can be renamed with the included COM port Redirect Utility.

This card will work with most serial RS232 devices including modems, serial printers, handheld PDAs, mice and trackballs, keypads, serial POS devices, digital cameras and more.

Overall features
  • PCIe serial card with one RS232 port
  • Low Profile bracket included
  • Drivers available for most operating systems
  • High performance and reliable chipset
  • Compliant with serial PCIe card specification 1.0a
  • Works in 5V and 3.3V tolerance options
  • Compatible with Standard 16C550 UART
  • Support PCI Power Management
  • WHQL certified drivers available

Useful optional accessories
(not included)

Null modem adapter
Null modem adapter

DB9 to RJ45 adapter
DB9 - RJ45 adapter

DB9 gender changer
Gender Changer

Part number SD-PEX15021
Operating system Windows 10 (32/64-bit), Windows 8.1 (32/64-bit), Windows 8 (32/64-bit), Windows 7 (32/64-bit), Vista (32/64-bit), XP, DOS, Android 1.x/2.x/3.x/4.x, Linux kernel 2.6.15 and later, Windows CE 6.0, 5.0 / Mobile 5 / Mobile 6 Driver
Processor MCS9922
Interface 1 port serial RS232, DB9 male connector
Data Bits 5, 6, 7, 8
Parity Even, Odd, None, Space, Mark
Bus type Serial PCIe / PCI-X (5 and 3.3V)
Buffer On Chip 256 Byte FIFOs for Transmit and Receive per port
Serial signals DCD, RXD, TXD, DTR, GND, DSR, RTS, CTS, RI
Parity Even, Odd, None, Space, Mark
Flow control Supports Hardware and Software flow control
Baud rates 50 bps to 250Kbps
PCIe specification Compliant with PCI Express Base Specification, Revision 1.1
Differential PCI Express Common Ref. Clock 100-MHz
PCI with transfer rate 1-Lane (x1) 2.5Gb/s
Warranty 1 year limited warranty

For alternative serial port cards please see our full selection of serial RS232 port cards

Read the Review
Date Added: 11/29/2014 by Dave Nielsen
4 of 5 Stars!4 of 5 Stars!
I bought this pcie card and a few other products from usconverters; all works fine and fairly easy t...

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Date Added: 05/15/2013 by David Glowny
5 of 5 Stars!5 of 5 Stars!
Works with ActiveHome Pro software in Windows 7 x64. Also works with the legacy ActiveHome software ...

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Date Added: 08/22/2011 by Donald Zannoni
4 of 5 Stars!4 of 5 Stars!
We have installed this card in several of our desktops used for our CNC controllers and it works fin...

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Date Added: 07/12/2011 by Jake Norman
5 of 5 Stars!5 of 5 Stars!
Recommended! works fine with Windows 7 and Linux in a virtual box. Apparently this Oxford processor ...

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Date Added: 04/30/2010 by Donald Moore
5 of 5 Stars!5 of 5 Stars!
I just inserted your PCI Serial Card x 2 model # ANPCI232x2 in my new Dell with Windows 7 64 bit PC ...

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Date Added: 01/22/2010 by Mark Chamberlain
3 of 5 Stars!3 of 5 Stars!
Good product for a fair price. works fine.

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Date Added: 01/22/2010 by Paul Calden
4 of 5 Stars!4 of 5 Stars!
Drivers worked fine for me. Computer booted perfectly and the card was ready to use immedeatley.

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