8 Port PCI RS232 Serial Adapter Card High Speed 16950 cable included

Add eight RS232 serial ports to any PC using a single PCI expansion slot

Product ID: PCI8S9503V

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  • Adds eight high speed RS-232 serial ports to your computer
  • Transfer rates of up to 921 Kbps
  • Breakout cable included

The PCI8S9503V 8 Port PCI RS232 Serial Adapter Card High Speed 16950 (cable included) lets you connect up to 8 RS-232 serial devices to the host computer at data rates up to 921 Kbps, and can be installed in either a 3.3V or 5V PCI/PCI-X slot.

The PCI serial card uses a 16 Byte buffer simultaneously in both transmit and receive channels, reducing the number of CPU interrupts while improving system performance.

Ideally suited to industrial applications, the buffered Serial PCI card is compatible with a broad range of operating systems, including Windows®, DOS®, Linux, and Unix operating environments.

Backed by a StarTech.com Lifetime warranty and free lifetime technical support.


  • Ideal for use in commercial and industrial applications such as POS networks, ATMs, and bank teller stations
  • Perfect for Manufacturing applications such as CNC machinery, process control equipment, bar code scanners and serial printers
  • Data center applications for serial networking devices, high speed modems, monitoring equipment, long distance communication devices and printers
  • Designed for use in critical applications with embedded systems and computer based machinery
  • Connect multiple serial devices for a central serial device control system

The StarTech.com Advantage

  • The included breakout cable saves expense as an all-in-one solution and allows the addition of multiple high speed RS-232 serial ports to a single low-profile PCI slot
  • Universal PCI card works in both 3.3 and 5.0 volt PCI/PCI-X slots saving the hassle of purchasing different cards depending on slot type
  • Compatible with most major OS platforms including Windows, Linux and Unix for simple integration into mixed environments

Partner Numbers

  • UPC 065030804370


  • Windows 8 logo
  • Linux logo
  • Windows 7 logo
Windows® 8 (32bit), 7 (32), Vista(32), XP(32), 2000, NT, 98SE, 98, 95
Linux (2.2.20 - 3.3) & Unix SCO Open Server


Warranty Information Warranty Lifetime
Connector(s) 1 - Connector Type(s) PCI / PCI-X (Universal 3.3 & 5V, 32-bit)
8 - External Ports DB-9 (9 pin, D-Sub)
Environmental Operating Temperature 0°C to 55°C (32°F to 131°F)
Storage Temperature 0°C to 65°C (32°F to 149°F)
Humidity 5~85% RH
Hardware Ports 8
Interface Serial
Bus Type PCI / PCI-X (5 / 3.3V)
Card Type Standard Profile
Port Style Dongle (Included)
Chipset ID PLX - PCI9030
Packaging Information Package Length 29,4 cm [11,6 in]
Package Width 70 mm [2,8 in]
Package Height 26,3 cm [10,4 in]
Shipping (Package) Weight 0,9 kg [1,9 lb]
Performance Serial Protocol RS-232
Max Baud Rate 921.6 Kbps
FIFO 16 Bytes
Supported Protocols RS232
Physical Characteristics Cable Length 1,2 m [4,0 ft]
Product Length 14,5 cm [5,7 in]
Product Width 20 mm [0,8 in]
Product Height 10,4 cm [4,1 in]
Weight of Product 800 g [28,2 oz]
Software OS Compatibility Windows® 8 (32bit), 7 (32), Vista(32), XP(32), 2000, NT, 98SE, 98, 95
Linux (2.2.20 - 3.3) & Unix SCO Open Server
What's in the Box 1 - Included in Package PCI Serial Card
8 Port DB9 Break-out Cable
Driver CD
Instruction Manual



DB9 to DB25 Serial Adapter - M/F

Convert a DB25 male port into a DB9 male connector

Your price
€3,99 EUR excl. VAT
€4,31 EUR incl. VAT


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Frequently Asked Questions


When you troubleshoot issues with a serial device, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:

  • Serial cables

  • Serial ports

  • Serial devices

To test your setup components, try the following:

  • Use the serial cable, serial port, and serial device in another setup to see if the problem is with the components or the setup.

  • Use a different serial cable, serial port, and serial device in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.

When you test your cables, it is recommended that you do the following:

  • Test each cable individually.

  • Use short cables when you are testing.

When you test the serial ports and serial device, it is recommended that you do the following:

  • Press the Windows key + R, type devmgmt.msc, and press Enter to open Device Manager. Check to see if your device is listed under Ports (COM & LPT).

  • Make sure that the COM port number is the correct number for the serial device and that the software being used to connect the computer to the serial device uses the correct COM port number. 

  • If the device is listed with an error, follow the instructions on the website to reinstall the drivers.

Note: Some serial devices work only if the COM port number is between a certain range. For example, COM1 to COM4.

To check whether or not an RS-232 serial port is working, perform an RS-232 loopback test by doing the following:

  1. If your serial port is not female, convert it by taking a female/female cable or gender changer and plugging it into the serial port.
  2. Take a metal paperclip or wire and cross pins 2 and 3. If you look closely at the female end, the pins should be numbered.
  3. Open a telnet session on the COM port number of the device that you are testing. To find out the COM port number, refer to the following FAQ: https://www.startech.com/faq/com-port-listing-windows.

Note: To open a telnet session on the COM port, you need a telnet client like PuTTY or Hyper Terminal. Windows XP comes with Hyper Terminal.

  1. When the session is open, anything you type into it you should see. The loopback test fails when you cannot see what you are typing.

If the loopback test fails, make sure that the serial cable or gender changer that you are using works and that the adapter is in the correct port. 

You can check multiple ports at the same time by opening multiple sessions, putting the loopback adapter on one port, and trying to type into each session.  When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is. Close the window for the port that you just tested to speed up the testing of the remaining serial ports.

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How To

To confirm that Windows detects your expansion card, complete the following:

  1. Press the Windows key+R, type devmgmt.msc, and press Enter.
  2. In Device Manager, under the appropriate heading, confirm that your expansion card is listed and that there isn't an exclamation mark next to it.  For example, a USB controller card would be under Universal Serial Bus controllers.

Your expansion card is listed according to the name of the chipset. To determine the name of the chipset of your expansion card, navigate to www.StarTech.com and look on the Technical Specifications tab for your product.

Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

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