Arduino to control TV via RS-232


I am trying a simple digital signage display based on the LG 32LV355C TV. This unit can be controlled via RS-232. I just need the tv to turn-on at a certain time or after a power outage, play a single file from USB continuously until e.g. 10PM and then turn off automatically. According to the sales rep (and confirmed by the manual) all the IR remote commands can be replicated via the RS-232 port, but I wonder if it would be possible to do it. On the other hand I do not know if the arduino could be easily associated to a battery powered clock so it keeps the time even after a pwer outage.

Any help will be greatly appreciated.