Sending Rs232 Commands to Projector, looking for guidance

I am looking to use a BeagleBone Black to send simple on/off commands to a projector attached via Serial using RS232 Commands. From what I have gathered I need to unable Uart in uEnv.txt. I am just looking for some guidance on what is necessary to accomplish this task also I am new to BeagleBone.

The O/S/ does not matter as I can change at this point to Ubuntu/Angstrom/etc

A) Is this possible?
B) Do I need the Serial Cape or can I use the P9 pins
C) IF you know how to do this or can point me in the right direction I would appreciate it.

Also if you know of any sites that would explain the pieces required to accomplish this I have no problem with doing additional research.