![]() Note the COM port number at the end of row for future reference. To correct the error, you will have to download the driver again by following these steps. Verify that there is no longer a yellow warning icon, and Prolific USB-to-Serial Comm Port is listed.Open the Device Manager (through the Windows Control Panel, or by right-clicking the Start button in Windows 10).click my computer for driver software From My. Under Driver, check whether the PL2303 driver version is 3.3.2.102. Solution 1: Roll Prolific USB to Serial Driver Back to An Older Version For driver software click My computer. Locate LPT/COM > Prolific USB to Serial Comm Port, and then right click it to select Properties. Download and install the recommended driver That is to say, you can install the right PL2303 driver like PL2303 3.3.2.102 via the system.Skip to “Selecting an Installed Cable Driver” below. However, at this early stage of the beta, these may not be available yet. You might want to check with the manufacturer of that device for any Windows 7 compatibility updates. The older driver recommended below will still be on the computer once installed, it just won’t be active. We have observed instances where this driver did not install automatically, possibly caused by security restrictions in Windows 10. As far as I know, there is no way to bypass the digital signature requirement for 64-bit hardware drivers. ![]() Let’s change that:Right click on the device and click on ‘Properties’. However many legacy applications expect the port to be between 1-4. Windows will occasionally install more recent drivers that may cause this issue to occur again after having fixed it. As you can see Windows has set the port to COM10. ![]() ![]() If you receive a COM port error while trying to download your data, or are unable to select your Legacy RadStar from the COM port selection dropdown, there is most likely an issue with the driver that is currently installed for the legacy cable. ![]()
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