Why a USB 2.0-GP-IB cable? GP-IB and USB are competing technologies for instrument control. Of course, USB 2.0 is built into Macs, but GP-IB is not. The thing that you should do is to buy and install a GP-IB card for your Mac. You can control seven instruments over a single GP-IB cable attached to your computer. Presumeably, you already have LabView. If you don't have a prebuilt virtual instrument for a particular component of your data acquisition apparatus, you can program it within LabView.