Update - Setting up PFsense

Hardware is pretty much the same.
DB9 <-> USB adapter:
Trendnet TU-S9

Female to Female DB9 connector w/null modem:
Tripp Lite Null Modem Serial RS232 Cable:
http://www.amazon.com/gp/product/B000067SCH

Driver for OS X needed to get the adapter to be properly recognized: http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=229&pcid=41

Serial console used is minicom:
brew install minicom

The reason for minicom is that control characters work well, though getting to configs from a running session is problematic.

 config info for minicom:

# Machine-generated file - use "minicom -s" to change parameters.
pu port             /dev/tty.usbserial
pu baudrate         115200
pu bits             8
pu parity           N
pu stopbits         1