Download the 32bit driver here or the 64bit driver here to be used with the PL2303 adapter that can be purchased cheap online.
To initiate an console connection find your device:
bash-3.2$ ls -la /dev/tty.*
crw-rw-rw- 1 root wheel 18, 2 26 Oct 08:32 /dev/tty.Bluetooth-Modem
crw-rw-rw- 1 root wheel 18, 0 26 Oct 08:32 /dev/tty.Bluetooth-PDA-Sync 
crw-rw-rw- 1 root wheel 18, 6 26 Oct 14:40 /dev/tty.PL2303-000013FA 
Execute:
 screen /dev/tty.PL2303-000013FA 9600 
If it doesn't work for you uninstall it this way;
kextunload /System/Library/Extensions/osx-pl2303.kext/
sudo rm -r /System/Library/Extensions/osx-pl2303.kext/
sudo rm -r /Library/Receipts/osx-pl2303.pkg