|Why on Earth would you want to connect a WiFi to your Point of Sale systems. Don't you watch the news and how Gas stations got robbed because they use WiFi on their pumps? If you hook WiFi to your POS systems and they broadcast Credit Card info over the air waves all some one has to do is capture that information and decrypt it later to get the info they want. Always use wires in POS systems.|
With that Warning, are you just simply wanting to setup WiFi for an Internet Cafe? If so the best way is to get a programmable switch that supports VLANs. Hook the switch to you router and setup two separate VLANs so that the WiFi guys can not see the POS systems, only the internet.