Just took anotehr look at the 303H console port.
It appears that its not a buildin 3.3 ttl to 5v usb serial adapter. The microUSB is just another connector form factor as the previous 4 pin headers. You still need to use the microUSB then break that out to a 3.3 v TTL to 5 v RS232/ usb console adapter.
So if you don't happen to have one of these sitting around, that you can hack together from your Raspberry Pi stash, you can use the e1 port.
Provide power via either a mid-span, or power adapter.
Add 172.31.98.1 setmeup.arubanetworks.com to your hosts file.
Then connect to port 1.
You should get an IP address of 172.31.98.x/24.
Go to setmeup.arubanetworks.com.
You can then set up from the GUI.