Mac OSX Drivers

The latest drivers can be downloaded from:
https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers

Scroll down on the page until you get to "Download for Macintosh OSX".

Download and unzip the file Mac_OSX_VCP_Driver.zip

Driver Installation
Mount the DMG file and double click on Silicon Labs VCP Driver.

On MacOS X 10.13 and later, the installation of the driver may be blocked. To unblock, open the System Preferences Security & Privacy pane and unblock the system extension. See Apple Technical Note TN2459 "User-Approved Kernel Extension Loading" for more information.

For MacOS X 10.9 and 10.10, see the folder called "Legacy MacVCP Driver".

Once installation has completed you will have a new virtual serial port which can be selected in your digital mode software for PTT, CAT, and CW/FSK.

Note: The latest drivers also support MacOS Big Sur 11.