I need to send an interupt out on the RS232 and get the time back.
What commands is best for it?
The answers are very fine. You have just decided that you don't believe them. That is your problem.
Do you want us to lie to you, just to pamper and comfort you and let you keep your misconception?
You have already been directed to look at all the sample code in the examples directory FOR SENDING CHARACTERS. You can not send interrupts, since interrupts are not physical entities. Interrupts are something that a chip may generate itself as response to an internal or external event. And when it comes to the UART, such events are reception or transmission of characters, or toggling of handshake signals.
By the way, if you do select another forum: Please post a link to the conversation in this thread. People may get a laugh about you ignoring perfectly good answers...