A couple of links from having this problem a few months ago. Bottom line: you may need a driver to make your Mac's USB appear to be a serial port. I had it working on Mac 10.6.8.
I can confirm that my USB port has been configured to be a serial port with this software:
When you get this figured out, would you help get this info on the wiki please?
judi
Begin forwarded message:
Message: 12
Date: Wed, 14 Aug 2013 19:47:47 -0700
From: Max Ogden <max@maxogden.com>
Cc: Sudo Discuss <sudo-discuss@lists.sudoroom.org>
Subject: Re: [sudo-discuss] 3D printing - help???
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<CAONf+LSFg5FQkxJsx2OcAGh6jU50cvBO5r9qh=cYZQ3K8pXJNw@mail.gmail.com>
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I'm down here at sudoroom trying to get the printer to connect to
Pronterface on my Mac but I can't get it working. The printer PC is
currently occupied by someone doing email. Has anyone done it on a Mac yet?
Maybe Mac OS 10.7 is incompatible or something.