There are 4 different models.
700Y (non touch screen 1 vga input)
700YV (non touch screen 1vga input and 2 video inputs)
700TS (touch screen 1 vga input)
700TSV (touch screen 1 vga input and 2 video inputs)
By the description of the cable you have, you either have a 700YV, or 700TSV. The TSV should also have a USB cable for the touch screen. To get external video sources on the screen, you need to change the video input mode.