Open the Device Manager (right-click) on the Start Menu and select “Device Manager”.Connect the USB to Serial adapter to the computer.Extract the contents of the zip file downloaded in Step 1.Download the legacy driver 1.20.0 from the download page here.It appears that Windows kept reinstalling the driver no matter how many times it was uninstalled. Unfortunately, their recommended instructions for uninstalling the current driver and installing the older version in its place did not work. Surprisingly, the newest driver does NOT work on Windows 11… but an older version from 2018 does…? It turned out to be a driver issue: Prolific, the manufacturer of the chipset used by several USB to Serial adapter brands, has yet to publish a driver for Windows 11. July for the ones from the download page) and so Windows prefers it over them.We discovered this issue because a Java program stopped communicating with an oscilloscope using an USB to Serial RS-232 cable after updating to Windows 11.
The problem is probably that the non-working driver is the newest (September 2021 vs. I had only one other entry, a "ser2pl.inf" version " 3.8.40.0".ĭisconnect the device, and "pnputil /delete-driver oemXY.inf" with the INF file you located in the previous step.Ĭonnect the device again, and it should work, at least, it does for me. Then "pnputil /enum-drivers", and in the output look for Prolific drivers other than the ones from the previous step. It will add the two driver packages to the driver store and tell you what oemXY.inf files it has assigned to them. What I did is this:įirst install the downloaded driver by unpacking the zip file and "pnputil /add-driver *.inf /subdirs /install" (the /install is probably not necessary) from the extracted "Win11_DCHU" directory. Getting it installed is a bit tricky, it seems. There is a working driver at, a bit down the page listed as "DCHU (for PC Vendors)".
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