Macintosh installation text for USB-to-Serial Converters:
Copy the Archive.sit.hqx to a temporary folder on your desktop.
Double Click the Archive.sit.hqx in the temporary folder and allow it to extract the files.
Enter the Archive Directory.
Highlight all of the files therein and copy them to the "Macintosh HD\System Folder\Extensions\" Directory.
Restart your computer.
Plug in the USB-to-Serial Converter.
You may configure it by using the Modems applet in the Control Panel.