2 Port USB to RS232 RS422 RS485 Serial Adapter with COM Retention

Add RS232, RS422 and RS485 support to your laptop or desktop computer via USB

Product ID: ICUSB2324852

4.3 stars (3 reviews) |
  • USB-powered; No additional external power adapter required
  • Both ports can function simultaneously with mixed or matched communication protocols
  • Backwards compatible with USB 1.1
Your price
€126.99 EUR excl. VAT
€154.93 EUR incl. VAT

The ICUSB2324852 2 Port USB to RS232 RS422 RS485 Serial Adapter with COM Retention lets you connect every type of serial device to your USB-enabled computer, whether it be for RS232, RS422, or RS485 communication. The adapter features a 9-pin (DB9) male and a 5-pin terminal block serial connector as well as dip-switch controls for easy port configuration with minimal software requirements. The adapter also supports using 2 ports simultaneously, including with mixed protocols; for example RS-232 on port 1, and RS-485 on port 2, or a number of other combinations.

For a convenient, and clean installation in office or industrial settings, the RS232/RS422/RS485 USB Adapter is wall-mountable and fully powered via the host USB connection, providing power to the attached serial device without requiring an external power adapter.

Backed by a StarTech.com 2-year warranty and free lifetime technical support.

Applications

  • Great for Industrial programmers looking to test new code with serial devices
  • Adapting and expanding POS systems
  • Security device control (key panels, cameras, card readers)
  • Perfect for controlling, monitoring, and diagnosing manufacturing machines (CNC, Process Control Equipment, Bar Code Scanners, Serial Printers)
  • Connect serial RS232, RS422, or RS485 devices to notebooks or tablet PC’s through the USB port

The StarTech.com Advantage

  • This single adapter is compatible with any serial device protocol (RS232, RS422, and RS485), and even allows mixing protocols for simultaneous communication over both ports
  • COM retention saves the assigned port settings for the device, so disconnecting/reconnecting is hassle-free
  • USB Powered - no power outlet required, and no cumbersome AC adapter to carry around

Partner Numbers

  • Ingram Micro Italy V931216
  • Tech Data - Italy 4462084
  • UPC 065030840965

Compatibility

  • Windows 8 logo
  • Windows Server 2012 logo
  • Linux logo
  • Windows 7 logo
  • Windows 10 logo
  • macOS Sierra (10.12) logo
  • macOS Mojave (10.14) logo
  • Windows Server 2016 logo
  • Windows Server 2019 logo
  • macOS High Sierra (10.13) logo
  • macOS Catalina (10.15) logo
  • macOS Big Sur (11.0) logo
Windows® CE (4.2, 5.0, 6.0), XP Embedded, 98SE, 2000, XP, Vista, 7, 8, 8.1, 10
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016, 2019
macOS 10.6 to 10.15, 11.0
Linux 2.4.x to 4.4.x LTS Versions only

Specifications

Warranty Information Warranty 2 Years
Connector(s) 1 - Connector Type(s) USB Type-A (4 pin) USB 2.0
1 - External Ports Terminal Block (5 Wire)
DB-9 (9 pin, D-Sub)
Environmental Operating Temperature 0°C to 55°C (32°F to 131°F)
Storage Temperature -20°C to 85°C (-4°F to 185°F)
Humidity 5~95% RH
Hardware Ports 2
Interface Serial
Bus Type USB 2.0
Port Style External Hub
Chipset ID FTDI - FT2232H
Indicators 1 - LED Indicators Red - Power LED
Packaging Information Package Height 40 mm [1.6 in]
Package Length 20.8 cm [8.2 in]
Package Width 14.4 cm [5.7 in]
Shipping (Package) Weight 310 g [10.9 oz]
Performance Serial Protocol RS-232/422/485
Max Baud Rate 921.6 Kbps
Data Bits 7, 8
FIFO 128 Bytes
Flow Control Xon/Xoff, Hardware, and None
Parity Odd, Even, Mark, Space, and None
Stop Bits 1, 2
Physical Characteristics Color Gray
Material Plastic
Product Length 82.3 mm [3.2 in]
Product Width 44.2 mm [1.7 in]
Product Height 23.2 mm [0.9 in]
Weight of Product 300 g [10.6 oz]
Power Power Source Not Included (not required for standard applications)
Output Voltage 5 DC
Output Current 0.385A
Center Tip Polarity Positive
Plug Type B
Software OS Compatibility Windows® CE (4.2, 5.0, 6.0), XP Embedded, 98SE, 2000, XP, Vista, 7, 8, 8.1, 10
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016, 2019
macOS 10.6 to 10.15, 11.0
Linux 2.4.x to 4.4.x LTS Versions only
What's in the Box 1 - Included in Package Wall mounting bracket
USB to RS232/RS422/485 Adapter
USB A to B Cable
Driver CD
Installation Guide

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Drivers/Downloads

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Driver(s):

Manual(s):

Datasheet

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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.­­­­­­­

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.

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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.

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

(3 reviews)
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(5 Stars)

The serial Modbus testing solution

By: David392 - 03/02/2017
I used this device in combination with a Modbus simulation program with success setting up serial communication between devices. Trouble free driver install on a Windows 7 laptop and straightforward directions setting up the serial protocol (my case RS 485)
| Helpful?
(5 Stars)

Solid and Reliable

By: jventerprises - 05/04/2018
I develop medium and high volume industrial test equipment for a living. I have used these specific modules for years and have never been disappointed. I use all the modes, RS232. 422, and 485. Never had a problem, or funny behavior. No dropped data, no corrupt data, no framing errors, etc. they just work. I use them directly through programs like teraterm, and through NIs Labview/TestStand. This is my 'go to' adapter
| Helpful?
(3 Stars)

Its ok

By: Jeremy - 11/08/2018
The included termination Block isnt great, has a hard time turning down onto thin wires and screws strip easily.
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