The standard latency on the Apple/FTDI driver is 16milli-Seconds this is too slow for reliable serial control. On Windows the FTDI driver allows you to set the latency, on Mac the latency is fixed. We provide a low latency FTDI Driver for MAC OSX Mac OS X10.15 and macOS 11/12. This is based on the FTDI Beta driver release and the installer should be run from the Applications folder on your machine.
Click below to download and run the "USB-422-mac.pkg", this will install the DEXT Installer "FTDIUSBSerialDextinstaller_1_5_0_low" in your applications directory. The instructions "New MacLow.pdf" can also be found in the applications directory.