Well, I have found out that one must obtain an ARM driver for the chipset used in your cable or external device. I've contacted keyspan to see if they have a driver and they do not at this time but was going to check with engineering to determine if one is being worked on for Windows 11 Pro ARM. They are supposed to get back to me. We will see how that goes.
In the meantime, I found out that there are ARM drivers for adapters that have an FTDI chip.
I ordered a Gearmo USA-FTDI-A36 ( [Link: gearmo.com]) from Amazon ( [Link: amazon.com] ).
After getting the new adapter, follow the instructions I posted below. Hope this helps someone.To get drivers for USB to Serial Adapter for Windows 11 Pro with ARMYou must purchase a USB to Serial Adapter that has the FTDI chip.Be sure the USB to Serial adapter is connected to Windows by clicking on Devices in the menu above Windows and selecting “USB & Bluetooth”, then select the USB to Serial adapter if not already chosen.Navigate to
[Link: ftdichip.com]Scroll down to Processor Architecture.
Download the latest for Windows Desktop under the heading of ARM
I downloaded 2.12.36.4A****
In the Comments column for the Windows Desktop row, open the link to Installation Guides. (Copy of the appropriate section of the guide is below).
I copied the file 2.12.36.4A**** to my Windows desktop.
NOTE: After driver is completely installed and all instructions followed, reopen Device Manager. Look for Ports (Com & LPT). Right click and choose Properties. Click on the Port Settings tab. Then click Advanced. Change Latency Timer (msec) to 1 (Default is 16). Click OK, then in the USB Serial Port (COM3) Properties window, click OK. Then close Device Manager. Restart Windows.
Afterwards, the USB to Serial adapter worked.
Here are the instructions
which must be followed all the way to the end.
3.3 Manual Installation If no suitable driver is automatically found, then the following procedure should be followed.
Note: This is the only method to install the ARM64 or universal versions of the driver.
Firstly, download the latest FTDI windows driver files from
[Link: ftdichip.com] and save the driver .zip file to a known folder on the PC. The desktop can be used so that the driver folder can be easily located then extract the .zip file.
To locate the device manager on windows 10/11, right click on the Microsoft logo at the bottom left-hand corner of the screen and select Device Manager as shown in Figure 3.9.
Figure 3.9 Device Manager Access In the Device Manager window there should be a device under Other Devices with a yellow warning symbol to indicate a problem i.e. no driver installed, as shown in Figure 3.10. The text next to this device will depend on the device attached. In this example the device was a USB Serial Cable.
8 Document Feedback Copyright © Future Technology Devices International Limited
Application Note
AN_396 FTDI Drivers Installation Guide for Windows 10/11 Version 1.1 Document Reference No.: FT_001281 Clearance No.: FTDI#486
Figure 3.10 Device Manager View Right click on the other device (USB Serial Cable in this example) to bring up a menu as shown in Figure 3.11. From the displayed menu select “Update Driver Software...”
Figure 3.11 Update Driver Software 9 Document Feedback Copyright © Future Technology Devices International Limited
Application Note
AN_396 FTDI Drivers Installation Guide for Windows 10/11 Version 1.1 Document Reference No.: FT_001281 Clearance No.: FTDI#486
This then displays the option for an automatic search or a manual search. Select the second option to browse manually as shown in Figure 3.12.
Figure 3.12 Browse my computer for Driver Software In the address box put the exact location where the drivers have been saved to. The location should be the top-level folder of the extracted files and contain two *.INF files. It is not necessarily the exact same location as shown in Figure 3.13. The drivers could have been saved anywhere on the PC by the user.
Figure 3.13 Search Location 10 Document Feedback Copyright © Future Technology Devices International Limited
Application Note
AN_396 FTDI Drivers Installation Guide for Windows 10/11 Version 1.1 Document Reference No.: FT_001281 Clearance No.: FTDI#486
After entering or browsing for the address, select “Next” to start the installation as shown in Figure 3.14.
Figure 3.14 Installing driver software When the installation has finished a completion screen is displayed as shown in Figure 3.15.
Figure 3.15 Successful Driver Software Update Press Close to close this window and go back to the Device Manager Window.
If the Virtual Com Port option has been enabled to load then Device Manager will show a device under Other Devices but in addition to this there is a new entry under Universal Serial Bus
11 Document Feedback Copyright © Future Technology Devices International Limited
Application Note
AN_396 FTDI Drivers Installation Guide for Windows 10/11 Version 1.1 Document Reference No.: FT_001281 Clearance No.: FTDI#486
Controllers indicated in Figure 3.16 as the USB Serial Converter. This indicates the bus layer of the driver is installed. Installing the Virtual Com Port layer of the driver is a repeat of the last few steps.
Figure 3.16 Device Manager View Right click on the other device (USB Serial Cable in this example) to bring up a menu as shown in Figure 3.17. From the displayed menu select “Update Driver Software...”
Figure 3.17 Update Driver Software This then displays the option for an automatic search, or a manual search as shown in Figure 3.18. Select the second option to browse manually
12 Document Feedback Copyright © Future Technology Devices International Limited
Application Note
AN_396 FTDI Drivers Installation Guide for Windows 10/11 Version 1.1 Document Reference No.: FT_001281 Clearance No.: FTDI#486
Figure 3.18 Browse my computer for Driver Software In the address box put the exact location where the drivers have been saved to. The location should be the top-level folder of the extracted files and contain two *.INF files. It is not necessarily the exact same location as shown in Figure 3.19. The drivers could have been saved anywhere on the PC by the user.
Figure 3.19 Search Location After entering the address select “Next” to start the installation as shown in Figure 3.20.
13 Document Feedback Copyright © Future Technology Devices International Limited
Application Note
AN_396 FTDI Drivers Installation Guide for Windows 10/11 Version 1.1 Document Reference No.: FT_001281 Clearance No.: FTDI#486
Figure 3.20 Installing driver software When the installation is finished a completion screen is displayed as shown in Figure 3.21.
Figure 3.21 Successful Driver Software Update Note this screen also displays the COM port number assigned to the device.
14 Document Feedback Copyright © Future Technology Devices International Limited
Application Note
AN_396 FTDI Drivers Installation Guide for Windows 10/11 Version 1.1 Document Reference No.: FT_001281 Clearance No.: FTDI#486
Press Close to close this window and go back to the Device Manager Window as shown in Figure 3.22.
Figure 3.22 Device Manager View This time Device Manager does not have an entry under Other Devices but does show entries under Universal Serial Bus Controllers and Ports (COM & LPT). Figure 3.22 displays a correct installation. The device is now ready to use on COM3.
Note: Not all devices will install to COM3. The COM port allocation is determined by the installation wizard based on the next free com port as designated in the PC registry. The COM port can be reassigned to another free port in advance properties as shown in Figure 3.23. FTDI have also produced a utility called COM PORT Assignment which can help assign the port to a different COM port number.
Figure 3.23 Advanced Settings