This project defines a standardized system design for a smart sensor interface using the long-range ultra narrowband Sigfox protocol. A Sigfox system includes end devices, gateways, network servers, and application servers. The standard defines the design and specifications of smart sensor interface adopting the Sigfox protocol to achieve data accuracy, interoperability (plug-and-play) based on the IEEE 1451.0 transducer services, data privacy, and harmonized performance of Sigfox systems. This standard includes the wireless transducer interface module (WTIM) (end devices), network capable application processor (NCAP) (gateway device, or 1451 server), and application (1451 client), and appropriate transducer electronic data sheet (TEDS). The standard also defines the Application Programming Interfaces (APIs) between WTIM and NCAP (1451 server) and harmonized radio frequency planning. This standard provides guidance to improve data accuracy, privacy, and quality-of-services (QoS).