Discontinued

3 ft 1s1p USB to Serial Parallel Port Adapter Cable

Add one RS232 Serial, and one IEEE 1284 Parallel port to your computer through a single USB connection

Product ID: ICUSB2321284

3.5 stars (2 reviews) |
  • Easy to setup and install - plug and play for most operating systems
  • No external power needed - draws power from the USB connection
  • Thin, lightweight design

The ICUSB2321284 1S1P USB to Serial/Parallel Adapter Cable enables you to connect DB9 RS232 serial devices and IEEE 1284 parallel devices to your PC or Linux laptop or desktop computer, through a single USB port, as though the computer offered onboard connectors.

An innovative solution, the adapter cable features both a parallel and serial port that can be used simultaneously, delivering serial and parallel data rates of up to 921.6 Kbps and 1Mbps (respectively) to ensure optimum performance from your connected devices.

Simple to install and use, the serial/parallel USB adapter is a cost-effective solution that bridges the connectivity gap between modern computers and legacy serial peripherals.

Backed by a StarTech.com 3-year warranty and free lifetime technical support.

Applications

  • Perfect for IT Administrators looking to add legacy functionality to newer laptops, desktops and servers that lack integrated RS-232 Serial and/or Parallel ports
  • Connect to console ports, UPS, and other devices in the server room/server closet
  • Connect, monitor and control industrial/automotive sensors and equipment
  • Connect bar code scanners, receipt printers and other point of sale devices
  • Connect a satellite receiver, serial modem, or PDA with serial sync

The StarTech.com Advantage

  • Single cable USB to Serial and Parallel design enables two legacy devices to be connected to a host computer through a single USB port
  • Drawing power from the USB bus saves the hassle of carrying an external power adapter for the add-on ports
  • Support for Windows® and Linux® operating systems allow for simple installation onto many desktop and laptop platforms

Partner Numbers

  • Tech Data 11384113
  • ASI 127313
  • D&H ICUSB2321284
  • SYNNEX US STA-ICUSB2321284
  • UPC 065030845113

Compatibility

  • Windows 8 logo
  • Windows 7 logo
  • Linux logo
  • Windows Server 2012 logo
  • Windows 10 logo
  • Windows Server 2016 logo
  • Windows Server 2019 logo
Windows® CE 5.0, XP, Vista, 7, 8, 8.1, 10
Windows Server® 2003, 2008 R2, 2012, 2016, 2019
Linux 3.5.x to 4.11.x LTS Versions only

Specifications

Warranty Information Warranty 3 Years
Connector(s) 1 - Connector Type(s) DB-25 (25 pin, D-Sub)
DB-9 (9 pin, D-Sub)
USB Type-A (4 pin) USB 2.0
Environmental Operating Temperature 0°C to 60°C (32°F to 140°F)
Storage Temperature -20°C to 80°C (-4°F to 176°F)
Humidity 0~65% RH
Hardware Ports 2
Interface Serial
Bus Type USB 2.0
Port Style Cable Adapters
Industry Standards RS232, IEEE 1284, USB 1.1
Chipset ID ASIX - MCS7715
Packaging Information Package Height 1.3 in [32 mm]
Package Length 5.6 in [14.3 cm]
Shipping (Package) Weight 4.0 oz [114 g]
Package Width 6.9 in [17.5 cm]
Performance Serial Protocol RS-232
Max Baud Rate 921.6 Kbps
Data Bits 5, 6, 7, 8
FIFO 192 Bytes
Parity Even, Odd, Mark, Space, None
Physical Characteristics Weight of Product 2.4 oz [69 g]
Color Black
Material Plastic
Cable Length 36.0 in [91.5 cm]
Product Length 39.4 in [100 cm]
Software OS Compatibility Windows® CE 5.0, XP, Vista, 7, 8, 8.1, 10
Windows Server® 2003, 2008 R2, 2012, 2016, 2019
Linux 3.5.x to 4.11.x LTS Versions only
What's in the Box 1 - Included in Package USB to Serial & Parallel cable
User Manual

Accessories

MXT106

15 ft Straight Through Serial Cable - DB9 M/F

Extend the connection between your DB9 serial devices by up to 15ft

Your price
$9.99USD

In stock: US: 37 | CA: 63

Where to buy StarTech.com products
MXT100

6ft Straight Through Serial Cable - DB9 M/F

Extend your EGA monitor cable or mouse cable by 6ft

Your price
$8.99USD

Check reseller availability

Where to buy StarTech.com products
Your price
$12.99USD

In stock: US: 30 | CA: 16

Where to buy StarTech.com products
MXT100FF

6 ft Straight Through Serial Cable - DB9 F/F

Connect two DB9 equipped serial devices

Your price
$8.99USD

In stock: US: 180 | CA: 66

Where to buy StarTech.com products
USB2FAAEXT15

15 ft USB 2.0 Active Extension Cable - M/F

Reliably extend the distance of a USB 2.0 device an additional 15ft

Your price
$22.99USD

In stock: US: 123 | CA: 146

Where to buy StarTech.com products
AT925FM

DB9 to DB25 Serial Cable Adapter - F/M

Convert a DB9 male port to a DB25 male port

Your price
$7.99USD

In stock: US: 0 | CA: 4

Where to buy StarTech.com products
Discontinued
AT925SFM

Slimline DB9 to DB25 Cable Adapter F/M

Convert a DB9 male connector to a DB25 male connector

Your price
$6.99USD

Check reseller availability

Where to buy StarTech.com products
SCNM9FM

10 ft DB9 RS232 Serial Null Modem Cable F/M

Transfer files via serial connection

Your price
$7.99USD

In stock: US: 387 | CA: 66

Where to buy StarTech.com products
SCNM925FM

10 ft Cross Wired DB9 to DB25 Serial Null Modem Cable - F/M

Connect your serial devices, and transfer your files

Your price
$7.99USD

In stock: US: 488 | CA: 271

Where to buy StarTech.com products
RS232EXTC1

Serial DB9 RS232 Extender over Cat 5 - Up to 3300 ft (1000 meters)

Extend an RS232 serial connection up to 1000 meters (3300 feet) using Cat 5 cabling

Your price
$128.99USD

In stock: US: 169 | CA: 128

Where to buy StarTech.com products

Drivers/Downloads

Talk to an Advisor

We are always ready to assist you with any questions you may have.

Live Chat (opens in new window)

Driver(s):

Manual(s):

Datasheet

Product Support

Talk to an Advisor

We are always ready to assist you with any questions you may have.

Live Chat (opens in new window)

Frequently Asked Questions

Installation

Some driver installation packages may require you to disable driver signature enforcement in Windows 8, which will allow unsigned driver packages to be installed on your system.

Note: Before you continue, save any open documents and close all open programs.

To disable driver signature enforcement, complete the following:

  1. Press the Windows key + C.
  2. Click Settings > Change PC Settings.
  3. In the left pane, click General.
  4. In the right pane, under Advanced startup, click Restart now.

When your system finishes restarting, complete the following:

  1. Click Troubleshoot > Advanced options > Startup Settings > Restart.
  2. Press 7.

When your computer restarts, driver signature enforcement will be disabled and you can install your drivers.

Note: When you restart your computer after you install your drivers, driver signature enforcement will be enabled again. This does not prevent your newly installed drivers from working, but does prevent any other unsigned drivers from being installed until driver signature enforcement is disabled.

Some driver installation packages may require you to disable driver signature enforcement in Windows 8.1, which will allow unsigned driver packages to be installed on your system.

Note: Before you continue, save any open documents and close all open programs.

To disable driver signature enforcement, complete the following:

  1. Press the Windows key + C.
  2. Click Settings > Change PC Settings.
  3. In the left pane, click Update & Recovery.
  4. In the left pane, click Recovery.
  5. Under Advanced startup, click Restart now.

When your system finishes restarting, complete the following:

  1. Click Troubleshoot > Advanced options > Startup Settings > Restart.
  2. Press 7.

When your computer restarts, driver signature enforcement will be disabled and you can install your drivers.

Note: When you restart your computer after you install your drivers, driver signature enforcement will be enabled again. This does not prevent your newly installed drivers from working, but does prevent any other unsigned drivers from being installed until driver signature enforcement is disabled.­­­­­­­

You may need to disable Driver Signature Enforcement in Windows 10 to use some driver installation packages. When you disable this feature, you can install unsigned driver packages on your computer.

Note: Before you continue, save any open documents and close all of your programs. You will need to restart your computer to disable Driver Signature Enforcement.

To disable Driver Signature Enforcement, complete the following:

  1. Click the Windows icon in the taskbar.
  2. Click Power.
  3. Press and hold the Shift key and click Restart.

After your computer finishes restarting, complete the following:

  1. Click Troubleshoot Advanced Options Startup Settings > Restart.
  2. Press 7.   

When your computer finishes restarting, Driver Signature Enforcement will be disabled and you can install the drivers.

Note: When you restart your computer after you install your drivers, driver signature enforcement will be enabled again. This does not prevent your newly installed drivers from working, but does prevent any other unsigned drivers from being installed until driver signature enforcement is disabled.­­­­­­­

Prior to installing this device, ensure that your operating system is up to date (for example, you have installed the most recent service pack).

To install the driver:

  1. Download the latest drivers from the StarTech.com website (http://www.startech.com/Support). You can find the part number and product ID on the product’s packaging.

Note: Windows will typically save the files to the Downloads folder that is associated with your user account (for example, C:\Users\your_name\Downloads).

  1. Once the download is complete, right-click the zip folder that you downloaded, select Extract All, and follow the on-screen instructions.
  2. Select the appropriate folder for your operating system.
  3. Right-click Setup.exe. 
  4. Click Run as Administrator.

Note: If the Run as Administrator option is not available, you might be attempting to run the installer from within the zipped file. Extract the files using the instructions in Step 2.

  1. Follow the on-screen prompts to install the device drivers and restart the computer when prompted.
  2. Your computer will automatically complete the driver installation and your device should be ready to use.

Prior to installing this device, ensure that your operating system is up to date (for example, you have installed the most recent service pack).

To install the driver:

  1. Download the latest drivers from the StarTech.com website (http://www.startech.com/Support). You can find the part number and product ID on the product’s packaging.

Note: Windows will typically save the files to the Downloads folder that is associated with your user account (for example, C:\Documents and Settings\your_name\My Documents\Downloads).

  1. Once the download is complete, right-click the zip folder that you downloaded, select Extract All, and follow the on-screen instructions.
  2. Select the appropriate folder for your operating system.
  3. Double-click Setup.exe.
  4. Follow the on-screen prompts to install the device drivers and restart the computer when prompted.
  5. Your computer will automatically complete the driver installation and your device should be ready to use.

Before you install the device, make sure that your operating system is current (for example, the most recent service pack is installed).

  1. Download the latest drivers from the StarTech.com website at http://www.startech.com/Support. The part number and product ID are on the product packaging.

Note: Windows usually saves the files to the Downloads folder that is associated with your user account (for example, C:\Users\your_name\Downloads).

  1. After the download is complete, right-click the zip folder that you downloaded, click Extract All, and complete the instructions.
  2. Press the Windows key + R, type devmgmt.msc, and press Enter to open the Device Manager.
  3. Right-click PCI Serial Port, which will have a “!” or “?” next to it to indicate a driver issue.
  4. Click Update Driver.
  5. Click Browse my computer for driver software.
  6. Select the Let me pick from a list of device drivers on my computer option.
  7. On the Select your device’s type from the list below screen, click Show All Devices, and click Next.

Note: The Select your device’s type from the list below screen does not appear on all systems. If you do not see this screen, skip this step.

  1. Select the Have Disk option.
  2. Browse to the Drivers folder and open the 32-bit or the 64-bit folder, depending on your system type.

Note: To view your system type, press Windows key + R, type control /name microsoft.system, and press Enter.

  1. Click the StnMF file or the NmXpMf file (only one of the file names is displayed). Click OK, and then click Next.
  2. The COM ports are listed in Device Manager under Ports (COM & LPT). Repeat steps 4 to 11 for each of the COM ports, selecting the StnPorts file or the NmPorts file in step 11.

Before you install the device, make sure that your operating system is current (for example, the most recent service pack is installed).

  1. Download the latest drivers from the StarTech.com website at http://www.startech.com/Support. The part number and product ID are on the product packaging.

Note: Windows usually saves the files to the Downloads folder that is associated with your user account (for example, C:\Documents and Settings\your_name\My Documents\Downloads).

  1. After the download is complete, right-click the zip folder that you downloaded, click Extract All, and complete the instructions.
  2. Press the Windows key + R, type devmgmt.msc, and press Enter to open the Device Manager.
  3. Right-click PCI Serial Port, which will have “!” or “?” next to it to indicate a driver issue.
  4. Click Update Driver.
  5. On the Hardware Update Wizard screen, click Install from a list or specific location (Advanced), and then click Next.
  6. Select the Don’t search, I will choose the driver to install option, and then click Next.
  7. On the Hardware Type screen, click Show All Devices, and then click Next.

Note: The Hardware Type screen does not appear on all systems. If you do not see this screen, skip this step.

  1. On the Select the Device Driver you want to install for this hardware screen, select the Have Disk option.
  2. In the Install from Disk dialog box, click Browse.
  3. Browse to the Drivers folder and open the 32-bit or the 64-bit folder, depending on your system type.

Note: To view your system type, press Windows key + R, type control /name microsoft.system, and press Enter.

  1. Click the StnMF file or the NmXpMf file (only one of the file names is displayed). Click OK, and then click Next.
  2. The COM ports are listed in Device Manager under Ports (COM & LPT). Repeat steps 4 to 11 for each of the COM ports, selecting the StnPorts file or the NmPorts file in step 11.

Troubleshooting

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.

For products related to this article, click here.

If the USB device does not work after your computer has been in extended hibernation, it is likely that Windows has automatically turned off the USB Root hub to save power. 

The steps below outline how to configure the USB root hub to stay on during hibernation, to prevent this from happening.
 

Windows 10 / 8

  1. On your keyboard, press the Windows key + X and select Control Panel.
  2. Click Hardware and Sound, then click Power Options.
  3. Click Change plan settings for the plan you want to change.
  4. Click Change advanced power settings.
  5. Click the plus sign (+) next to “USB settings” and “USB selective suspend setting” to expand the options and change the setting to Disabled.
  6. Click OK to apply the setting.

Note: You may need to disconnect and re-connect your USB device after applying these settings to re-establish the connection.

Windows 7 / Vista

  1. Click the Start button and select Control Panel.
  2. Click Hardware and Sound, then click Power Options.
  3. Click Change plan settings for the plan you want to change.
  4. Click Change advanced power settings.
  5. Click the plus sign (+) next to “USB settings” and “USB selective suspend setting” to expand the options and change the setting to Disabled.
  6. Click OK to apply the setting.

Note: You may need to disconnect and re-connect your USB device after applying these settings to re-establish the connection.

Windows XP

  1. On your desktop, right-click the My Computer icon and select Properties.
  2. Click the Device Manager tab.
  3. Expand Universal Serial Bus controllers by clicking the arrow to the left of it.
  4. Right-click the first USB Root Hub device and select Properties.
  5. Click the Power Management tab.
  6. Clear the box next to Allow the computer to turn off this device to save power.
  7. Click OK to apply the setting.
  8. Repeat steps 4-7 for any remaining devices in the Universal Serial Bus Controllers section with “Root Hub” in the name.

Note: You may need to disconnect and re-connect your USB device after applying these settings to re-establish the connection.

When you troubleshoot issues with a serial or parallel hybrid 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 or parallel cables

  • Serial or parallel ports

  • Serial or parallel devices

To test your setup components, try the following:

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

  • Use a different serial or parallel cable, serial or parallel port, and serial or parallel 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 or parallel ports and serial or parallel device, it is recommended that you do the following:

Note: Some serial devices work only if the COM or LPT port number is between a certain range. For example, COM1 to COM4 for serial and LPT1 and LPT2 for parallel.

Note: There is not an equivalent loopback test that can be performed for parallel devices.

How To

To confirm that Windows detects your USB device, 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 USB device is listed according to the name of the chipset. To determine the name of the chipset of your USB device, navigate to www.StarTech.com and look on the Technical Specifications tab for your product.

Compliance and safety

Compliance letters

  • RoHS
    • Language: English
  • WEEE
    • Language: English

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.

Customer Reviews

(2 reviews)
3.5 out of 5 stars
  • 5 (1)
  • 4 (0)
  • 3 (0)
  • 2 (1)
  • 1 (0)
Tell us what you think of this product.
Need a little help getting started?

Check out our review guidelines.

1 - 2 of 2 Reviews
Sort
(5 Stars)

By: Atlantc - 03/08/2018
| Helpful?
(2 Stars)

Poor quality

By: Gaz79 - 12/14/2018
I had to open the moulded cover over the d-types and re-solder the connections as pin 5 of the 9-way (ground) was not connected properly causing the cable not to work. Now I've fixed it, it works fine.
| Helpful?
Feedback Back to top