You can simulate the strings, passings data from COM1 to COM2 of your development computer. Use the Hyperterminal tool from windows. You can create a txt file whit the complete string. From transfer option (hyperterminal program) select this file and receive for the other port. All you need is a cable. If you have two computers ,also you can do it in that way.
"Anyone who has never made a mistake has never tried anything new." A.E
"The important thing is not to stop questioning. Curiosity has its own reason for existing." A.E