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PCI Serial Card, 2-Ports RS232

  • Model: SD-PCI-2S
  • In Stock


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The Problem with some PCI Serial Cards.

BAD PROCESSOR CHIPS?! Does some serial port cards really have bad processor chips? ABSOLUTELY! Unless you invest in a PCI serial card with a quality processor and chipset you will very likely, at some point, experience either a computer freeze, driver errors, being unable to communicate with your serial device or even a BSoD. The reason is that most low-cost PCI serial cards are designed with a low-cost processor which has low-cost poorly written drivers, which obviously results in headaches for the user.

The Solution.

Our Premium RS232 PCI Serial card shown in the image above uses a quality processor (MCS9835) from MosChip Technology/ASIX which provides superior performance and reliability at unmatched data transfer rates. The card adds two high-speed 9-pin serial COM ports to any PCI equipped (unlike USB based) computer with drivers available for Windows XP, Vista, 7, 8, 8.1 and 10 32/64-bit, DOS, Linux and Windows CE.

After installing the downloadable drivers the created COM ports will automatically show up in your operating system's Device Manager as two additional ports. Since these ports are PCI based they can be used as if it was standard built-in COM ports.

Both RS232 serial ports share same IRQ which saves valuable resources if other expansion cards are used. Easy Plug and Play installation automatically configures the next available COM port and IRQ address. COM ports can also easily be renamed within your operating system's Device Manager.

Connecting external modems, serial printers, handheld PDAs, mice and trackballs, keypads, serial POS devices, digital cameras and more has never been easier!

Overall features
  • Two high performance PCI Serial RS232 ports
  • Drivers available for most operating systems
  • Supports Hardware / Software flow control
  • Works with both 5V and 3.3V PCI slots
  • Compatible with Standard 16C550 UART
  • Fully compliant with PCI Serial Card Spec. Rev 2.3
  • 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-PCI-2S
Operating system Windows 10 (32/64-bit), 8.1 (32/64-bit), Windows 8 (32/64-bit), Windows 7 (32/64-bit), Vista (32/64-bit), XP, DOS, CE 5.0, CE 6.0, Linux
Processor MCS9835
PCI specification Fully compliant with PCI Local Bus Specification, Revision 2.3
Power PCI bus, 5 and 3.3V compatible
Interface 2 ports serial RS232, DB9 male connectors
Serial signals DCD, RXD, TXD, DTR, GND, DSR, RTS, CTS, RI
Data Bits 5, 6, 7, 8, 9
Parity Even, Odd, None, Space, Mark
Flow control Supports Hardware and Software flow control
Baud rate Up to 115.2K bits/sec on each port
Buffer On Chip 256 Byte FIFOs for Transmit and Receive per port
Current draw Less than 100mA
Differential PCI Express Common Ref. Clock 100-MHz
PCI with transfer rate 1-Lane (x1) 2.5Gb/s
Operating temperature -20 to 60°C
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: 09/02/2013 by Stephen Morris
4 of 5 Stars!4 of 5 Stars!
works fine with my older windows xp computer. fast shipping, thanks a lot.

Read the Review
Date Added: 07/20/2011 by Andrew Pickett
4 of 5 Stars!4 of 5 Stars!
Got this card for an older DOS computer, since the specifications mentions that this card works with...

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Quick Tip!

The PCI Serial card - Generally.

The PCI serial card is an easy and reliable way of adding serial ports to your computer. When shopping for a PCI serial card it is important that you choose a card which is suitable and compatible for your serial device and computer. Of high importance is the chipset of the card. There are many models and brands of chipsets, we recommend a serial PCI card chip from either Moschip or FTDI, these processors have proved to be effective and reliable in most applications. The typical serial card contains one or two serial COM ports however it is also available in multi-port versions.

Once the drivers for the serial card has been successfully installed a COM port will show up in your operating system's Device Manager where you can configure several port settings, if your serial PCI card has good drivers. Some cards with poorly written drivers cannot be configured. The COM port that shows up in Device Manager, created by the serial card and the drivers can be used as if it was a built-in COM port.
Since the COM ports created with a serial PCI card are actual physical COM ports, not virtual COM ports, they can be used with almost any serial device, even latency sensitive devices since there are no data delays. Unlike USB based serial cards which due to the virtual COM port drivers have a substantial data delay which can make communication with some sensitive serial devices impossible.

When shopping for a PCI serial card be aware that the socket will match your computer. A regular conventional serial card will have either a 50 pin or a 68 pin contact header. Depending on the voltage the serial card is using it have wither 1 or 2 key notches that will fit into the particular connector inside your computer. The serial PCI cards we are selling are compatible with both 3.3V and 5.0V so regardless of which voltage your computer supplies our card will fit. You can read much more about PCI cards at Wikipedia.

Some low-cost PCI cards has jumpers which needs to be set in order for you to be able to communicate with a particular device. This is kind of old fashioned since most newer serial cards are automatically configured to match your serial device. You will however still be able to adjust several port settings in your operating systems device manager, such as baud rate, data bits and in some cases timing.

For other serial converters and alternative solutions please see our selection of serial port cards.


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