All about Cin7 Receipt Printers
The Epson TM-m30 is Cin7's choice of receipt printer and is compatible with PC (USB) , MAC (Ethernet or USB) or even an iPad (Ethernet - Hard wired to wireless router). It comes standard with USB & Ethernet Interfaces as standard.
When it comes to setting your receipt printer, you can go to the Cin7 knowledge base which has instructions on how to get your printer setup using PC or MAC.
To print a receipt from your iPad you can use IP printing if you have a network printer connected to your local network.
Cin7 only supports (and recommends) one printer that is compatible with iPads, the Epson TM-m30, though others may be available.