The Verifone T650 is one of the payment device options for a Genius terminal. It cannot share a terminal with a PAX or a CFD.
See Connect a Genius device to Wi-Fi for both the Wi-Fi steps and the static IP over Ethernet steps.
See Pair a payment terminal with a POS station.
Confirm what else is going on that station. If the site wants a customer facing display, the T650 is not the right device for that terminal. Sorting this at the quote stage saves a return.
Source: Global Payments Genius POS Setup Guide. Newly built article, pending review.