Thanks! I was able to get the cable I built working in Minicom! It still did not work for me in Get Console though.
I wonder if it is as simple as the Redpark cable being accessed on a different port than /dev/tty.iap? Can anyone with the Redpark cable confirm whether the port is different for the Redpark cable? If that is the case maybe a simple sym link would make it work. Besides that does anyone have other ideas on why it wouldn't work in GetConsole?