The NFC Digital Protocol specification addresses the digital protocol for NFC-enabled device communication, providing an implementation specification on top of the ISO/IEC 18092 and ISO/IEC 14443 standards. It harmonizes the integrated technologies, specifies implementation options and limits the interpretation of the standards; in essence, showing developers how to use NFC, ISO/IEC 14443 and JIS X6319-4 standards together to ensure global interoperability between different NFC devices, and between NFC devices and existing contactless infrastructure. The NFC Digital Protocol specification defines the common feature set that can be used consistently and without further modification for major NFC applications in areas such as financial services and public transport. More specifically, the specification covers the digital interface and the half-duplex transmission protocol of the NFC-enabled device in its four roles as Initiator, Target, Reader/Writer and Card Emulator. The specification includes bit level coding, bit rates, frame formats, protocols, and command sets, which are used by NFC-enabled devices to exchange data and bind to the LLCP protocol. Both the Digital Protocol and LLCP specifications are candidates for final release pending feedback from NFC Forum members and other standards organizations. By releasing these specifications in advance, the NFC Forum is enabling organizations in the NFC ecosystem to begin integrating them into their own work. This gives both NFC Forum members and other standards organizations an opportunity to both accelerate their development and provide valuable feedback that can be incorporated into the final specifications. Once the feedback has been evaluated and integrated, both specifications will be officially approved and released by the NFC Forum. www.nfc-forum.org/specs/