Sorry, one last item... I found that I like programing the A9using a stylus. I program WonderWare touch screen displays at work and I've got a few touch screen stylus' that fit on your finger like a thimble. It's certainly not necessary but you can also get a PDA style sylus cheap and it made it more enjoyable for me for an initial model setup. At the field just "tweaking" your program it's not needed at all but it will keep you from pushing the wrong "button" on some of the smaller cells.