Understanding Smart Sensors - Nomads.usp

Standards for Smart Sensing 277NCAP(Network capable application processor)11Contains 1 or moreExecutes in 1ProcessExecutes in 1Executes in 11 1 1 1 1 1 1 1Contains1Contains0 or moreContains0 or moreExecutes in 1Contains0 or moreExecutes in 1Local NCAPblockFunctionblocksBase transducerblocksNon-IEEE 1451objectFigure 12.3 Top-level object relationships. (After: [2].)non-IEEE 451 objects but only one object NCAP block. Object-identifyingproperties are the object’s• Class ID;• Class name;• Object ID;• Object tag;• Object name;• Object dispatch address.The IEEE 1451.1 standard provides both physical and logical specificationsfor the smart transducer object model [2]. In Figure 12.4, the solid linesrepresent the physical components of the system, and the dotted lines providethe logical view. The sensors and the actuators form a transducer that is connectedover an interface to a microprocessor or microcontroller. The networkprotocol logical interface and transducer logical interface are defined in 1451.1.IEEE 1451.2 defines the (hardware) interface between transducers and theNCAP. The interfaces are optional, and either 1451.1 or 1451.2 can be implementedwithout the other. If support for interoperable transducers is notrequired, only 1451.1 could be used. If networking is not required, IEEE1451.2 would be sufficient.