Or, you can do as i did. I had to access the serial on an AP103 and could not get a hold of the propper console cable at the moment. I searched the Airheads community and with the info i could find i sucessfully managed to access the console using a cheap USB-TTL converter i had at home:
http://www.ebay.com/itm/FTDI-FT232RL-USB-to-TTL-Serial-Converter-Adapter-Module-5V-3-3V-for-Arduino-/321875438143?hash=item4af1456a3f



USE AT OWN RISK!

I do not guarantee this will work, if done wrong there is a risk that you permanently damage the console port of your AP/RAP!