1 Port USB to RS232 DB9 Serial Adapter Cable - M/M

Add an RS232 serial port to your laptop or desktop computer through USB

Product ID: ICUSB232V2

4,2 stars (5 reviews) |
  • USB to Straight-Through RS232 DB9 Serial Adapter
  • High-speed 921.6Kbps Baud Rate
  • Compatible with Windows® 8 and later, Mac OS, and Linux
Your price
€18,99 EUR excl. VAT
€23,74 EUR incl. VAT

The ICUSB232V2 1 Port USB to Serial Adapter converts a USB port into an RS232 DB9 serial port to connect to, monitor, and control a serial device.

Supporting data transfer rates up to 921.6 Kbps, the USB to serial cable is a convenient and cost-saving solution for providing serial connectivity to devices such as point-of-sale terminals, serial modems, industrial equipment, and a wide variety of other RS232 peripherals.

The USB to RS232 converter is easy to install and offers broad operating system compatibility, including Windows® 8 and later, Linux and Mac OS®, for easy integration into mixed environments.

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

Applications

  • IT Administrators looking to add legacy functionality to newer notebooks, PCs and servers that lack an integrated RS232 port
  • Connect bar code scanners, receipt printers and other point of sale devices
  • Connect, monitor and control industrial/automotive sensors and other sensitive equipment
  • Connect and program LED and digital signage boards

The StarTech.com Advantage

  • Install in almost any laptop or desktop computer through broad operating system compatibility, including Windows 8 and later
  • Communicate efficiently with connected devices with high-speed 921Kbps support
  • Portable and lightweight, the USB-Powered design requires no additional power adapter

Partner Numbers

  • Ingram Micro Sweden V932977
  • ALSO Sweden 000000000002763737
  • UPC 065030852609

Compatibility

  • Windows 8 logo
  • Linux logo
  • Windows Server 2012 logo
  • Windows 10 logo
  • Mac OS X El Capitan (10.11) logo
  • macOS Sierra (10.12) logo
  • Windows Server 2016 logo
  • macOS High Sierra (10.13) logo
  • macOS Mojave (10.14) logo
  • Windows Server 2019 logo
  • Windows Server 2019 logo
  • macOS Catalina (10.15) logo
Windows® 2000, XP, Vista, 7, 8, 8.1, 10
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016, 2019
Mac OS® 9.x, 8.x, 10.6 to 10.15
Linux 2.4.31 to 4.11.x LTS Versions Only

Specifications

Warranty Information Warranty 3 Years
Connector(s) Connector A 1 - USB Type-A (4 pin) USB 2.0
Connector B 1 - DB-9 (9 pin, D-Sub)
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 1
Interface Serial
Bus Type USB 2.0
Port Style Cable Adapters
Industry Standards USB 1.1/2.0
RS232
Chipset ID Prolific - PL2303RA
Packaging Information Package Height 21 mm [0,8 in]
Package Length 22 cm [8,7 in]
Shipping (Package) Weight 0,1 kg [0,1 lb]
Package Width 20 cm [7,9 in]
Performance Serial Protocol RS-232
Max Baud Rate 921.6 Kbps
Data Bits 5, 6, 7, 8
FIFO 512 Bytes
Flow Control None, Xon/Xoff, RTS/CTS, DTR/DSR
Parity Odd, Even, Mark, Space, or None Parity Modes
Stop Bits 1, 1.5, 2
MTBF 30,000 Hours
Physical Characteristics Weight of Product 40 g [1,4 oz]
Material Plastic
Product Length 43 cm [16,9 in]
Product Width 35 mm [1,4 in]
Product Height 2 cm [0,8 in]
Software OS Compatibility Windows® 2000, XP, Vista, 7, 8, 8.1, 10
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016, 2019
Mac OS® 9.x, 8.x, 10.6 to 10.15
Linux 2.4.31 to 4.11.x LTS Versions Only
Microsoft WHQL Certified Yes
Special Notes / Requirements System and Cable Requirements One available USB 1.1 (or above) port
What's in the Box Included in Package 1 - USB to RS232 Adapter
1 - Instruction Manual

Accessories

MXT10050CMBK

0.5m Black Straight Through DB9 RS232 Serial Cable - M/F

Extend the connection between your DB9 serial devices by up to 0.5m

Your price
€2,99 EUR excl. VAT
€3,74 EUR incl. VAT
MXT1001MBK

1m Black Straight Through DB9 RS232 Serial Cable - M/F

Extend the connection between your DB9 serial devices by up to 1m

Your price
€3,99 EUR excl. VAT
€4,99 EUR incl. VAT
MXT1002MBK

2m Black Straight Through DB9 RS232 Serial Cable - M/F

Extend the connection between your DB9 serial devices by up to 2m

Your price
€4,99 EUR excl. VAT
€6,24 EUR incl. VAT
MXT1003MBK

3m Black Straight Through DB9 RS232 Serial Cable - M/F

Extend the connection between your DB9 serial devices by up to 3m

Your price
€5,99 EUR excl. VAT
€7,49 EUR incl. VAT
SCNM9FM1MBK

1m Black DB9 RS232 Serial Null Modem Cable F/M

Connect your serial devices, and transfer your files

Your price
€3,99 EUR excl. VAT
€4,99 EUR incl. VAT
SCNM9FM2MBK

2m Black DB9 RS232 Serial Null Modem Cable F/M

Connect your serial devices, and transfer your files

Your price
€5,99 EUR excl. VAT
€7,49 EUR incl. VAT
MXT10010

10 ft Straight Through Serial Cable - M/F

Extend your EGA monitor cable or mouse cable by 10ft

Your price
€4,99 EUR excl. VAT
€6,24 EUR incl. VAT
USBEXTAA3BK

3 ft Black USB 2.0 Extension Cable A to A - M/F

Extends the length of your current USB device cable by 3 feet

Your price
€2,99 EUR excl. VAT
€3,74 EUR incl. VAT
USBEXTAA6BK

6 ft Black USB 2.0 Extension Cable A to A - M/F

Extends the length of your current USB device cable by 6 feet

Your price
€3,99 EUR excl. VAT
€4,99 EUR incl. VAT
USBEXTAA10BK

10 ft Black USB 2.0 Extension Cable A to A - M/F

Extends the length of your current USB device cable by 10 feet

Your price
€4,99 EUR excl. VAT
€6,24 EUR incl. VAT

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)

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

Starting in High Sierra 10.13, macOS enforces stricter security policies than previous revisions. As a result of these changes, software packages, like those used in this installation, will need to be allowed within the macOS Security and Privacy settings, immediately after the software has been installed, in order for the device to operate.

To allow the software, follow these steps after you've completed installation on your Mac:

  1. Open System Preferences.
  2. Open Security & Privacy.
  3. Click the Allow button near the bottom of the General tab.

Note: The option to allow the software will be available within the Security & Privacy settings for 30 minutes. If the software is not allowed within that time frame, the software must be reinstalled in order for macOS to grant the opportunity to allow it again.

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. In the list of extracted files, right-click the Setup.exe file and select 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. Once Windows has restarted, connect the USB serial adapter to your computer.
  3. 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. In the list of extracted files, double-click the Setup.exe file.
  3. Follow the on-screen prompts to install the device drivers and restart the computer when prompted.
  4. Once Windows has restarted, connect the USB serial adapter to your computer.
  5. Your computer will automatically complete the driver installation and your device should be ready to use.

Troubleshooting

Older applications that use serial communication often use legacy hardware addresses that do not work with PCI, PCIe, or USB to Serial products. We recommend contacting the software provider/support team to check if this is the case.

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.

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.

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.

To confirm that the Mac OS detects your USB device, complete the following:

  1. Click the Apple icon.
  2. Click About This Mac.
  3. Click More Info or System Report.
  4. Under the appropriate heading, confirm that your USB device is listed and that there isn't an error. For example, a network card would be under Ethernet Cards.

You may need to refresh the System Information page after you plug in your device.  To do so, press Command R with the System Information page open.

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.

Common Issues

Use a USB to Serial product that features COM Port Retention.  These products will store settings that are unique to the connected device in non-volatile memory, allowing you to retain the desired settings regardless of the USB Port to which the adapter is connected.

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.

Customer Reviews

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

Check out our review guidelines.

1 - 5 of 5 Reviews
Sort
(5 Stars)

it works

By: david74656 - 07-07-2015
Works perfectly !!! once I got the correct port ( com 3 not com 1) Windows 8.1 64 bits
| Helpful?
(5 Stars)

this is what I was looking for

By: andy - 02-04-2016
i bought this item 6 weeks ago and in the next week i will be placing an order for 100 more pieces
| Helpful?
(5 Stars)
By: sydiskid - 03-22-2017
| Helpful?
(1 Stars)

driver install

By: Tech3 - 09-25-2017
Unable to try out the device as regardless of the method for installation of the windows driver for Win pro 7, the install always comes up saying it aborted. Software is horrible.
| Helpful?
Brian L, Customer Support on 2017-10-02 13:27:22
Thank you for sharing your review of our ICUSB232V2. We're very sorry to hear the device isn't working as anticipated. It's possible you have our ICUSB232 which looks similar but requires a different driver for it to function. If that driver doesn't resolve the issue, please reach out to us via live chat at chat.startech.com. We have Technical Support Advisors available 24 hours, 5 days a week.
(5 Stars)

Worked 1st time.

By: Seadub01 - 03-19-2019
Downloaded and installed the drivers, and it just worked. I broke a pin on my serial connector on my service laptop, and this resolved the issue.
| Helpful?
Feedback Back to top