Click on the link to PL2303 USB to Serial Drivers. Here is Prolific's overview page (if you are asked to log in, please use GUEST als both user name and password).
from Manhattan or Hama), please install Prolific's current driver version. If you are using an adapter with a Prolific chip set (e.g. If you successfully use this driver with macOS Big Sur, please let us know. We did not verify that this driver actually works but we assume it does. Driver version 4.0b4 for macOS 10.12 to 10.15ĭriver version 4.0b4 can be installed under macOS Big Sur (the macOS system report displays version 4.0).If you are using a Keyspan adapter (USA-19HS), please install the manufacturer Tripp Lite's current driver version. Please review the note on the required user approval to load new hardware drivers. Please review the note on support of Macs with Apple processor. Driver version 2.4.4 for macOS 10.9 and aboveĭriver version 2.4.4 can be installed under macOS Big Sur where it works as intended.from DeLock or Digitus), please install FTDI's current driver version. If you are using an adapter with an FTDI chip set (e.g. Please use our instructions at the end of this page to determine the type of USB serial adapter that you are using. We are aware of adapters with chip sets of three manufacturers: FTDI, Keyspan, and Prolific. The important thing here is not the manufacturer of the adapter (of which there are many), but the manufacturer of the adapter's chip set. Please first check what kind of USB serial adapter you are using. See Apple Technical Note TN2459 User-Approved Kernel Extension Loading for details. You may need to quit direct and unplug and reconnect the USB serial adapter after having approved loading of the driver.If you did not approve then, no warning panel will be shown in the future (the approval UI in System Preferences will reappear though). The warning panel will only pop up when the system tries to load the driver for the first time.Try unplugging and reconnecting the USB serial adapter, then going back to the System Preferences main page, and then reopening the Security & Privacy section. If you wait too long, you will no longer be able to approve loading of the driver.
The approval UI in System Preferences will only be visible for 30 minutes.You may not have to do this at all if a previous version of the driver had already been installed on your computer before you upgraded to your current macOS release. At this time you will need to open System Preferences, select the Security & Privacy section, and click Allow. Depending on the driver this may be during driver installation, after the next system reboot, or when the USB serial adapter is first plugged in.
Please note: since macOS High Sierra user approval is required before new hardware drivers are loaded.Ī warning panel will pop up when the system tries to load the new driver for the first time. MacOS requires user approval to load new hardware drivers
If in doubt, we recommend to wait with the switch to a Mac with Apple processor, until the vendor of your USB serial adapter has released an appropriate new driver. Ilink does not support you in the installation or use of drivers with reduced security policy on the startup disk. Change startup disk security settings on a Mac with Apple silicon.The installation of the driver will lead to a corresponding alert message. On Macs with Apple processors though, kernel extension can only be installed if the security policy on the startup disk is reduced.
On macOS Big Sur (11) on Macs with Intel processors, both types of hardware drivers (the older and newer ones) are still supported. This method has been deprecated since macOS Catalina (10.15) and Apple has provided newer methods to develop hardware drivers.Īs of March 2021, all three drivers of USB serial adapters that we are aware of (FTDI 2.4.4, Tripp Lite 4.0b4, Prolific 2.0.0) are still older kernel extensions. Historically, hardware drivers were developed as kernel extension oder "kext". Hardware drivers on Macs with Apple processors Even in those cases where your current driver version seems to run under macOS Big Sur.
Since the adapter's manufacturers often only provide sparse information about OS compatibility of specific driver versions, we recommend to use the update to macOS Big Sur to also update your USB serial adapter's driver. This might be the case with the update to macOS Big Sur as well. In other cases, a new driver version was required. In some cases the driver of the USB serial adapters just needed to be reinstalled after the OS update. After past OS updates, some customers reported that direct no longer worked after the upgrade.