using A Security System Via the Serial Port

Hello Again Guys!

Sorry I've been away for a while.

Just a quick question, which'll probably remain unanswered..

Anyone know where I can find the rawcode for information from a serial port, like the actual hex values that windows recieves, I don't want anything like x_up or x_down, but the code for the actual input pins.

I am trying to connect a series of home made laser beam breakers to a security system, I have the code on a graphical system, I have a PIC chip giving up to 15 pin outputs, but I would like to link them together.... Any help is appreciated, (and I know u guys like a challenge :-D)