The Association for Retail Technology Standards (ARTS) is an international membership organization dedicated to reducing the costs of technology through standards. Since 1993, ARTS has been delivering application standards exclusively to the retail industry. ARTS has four standards: The Standard Relational Data Model, UnifiedPOS, IXRetail and the Standard RFPs.They've completed the first such specification for POS devices, with the goal of unifying the POS interface, thereby facilitating the interaction between POS terminals, servers and other devices. The integration also comes as welcome news for kiosk integrators and digital signage software makers, as this simplifies the otherwise arduous task of integrating these software systems together.
KioskMarketplace has a nice article about the new standards here, which you should go read.