Networked Smart Sensor and Its Plug & Play Interface Design

Information technology consists of three divisions:information acquisition,information processing and information transmission.But the first is laying far behind the other two.Nowadays,information acquisition in network environments is an important research area and the sensor networked interface technology is one of the key problems.A smart transducer network consisting of a set of transducer nodes with digital bus is introduced in this paper.The design idea is based on IEEE1451 transducer interface standards.Some requirements,such as `plug_and_play' capability,system integration and dynamic reconfiguration,are described,which is achieved through an `transducer electronic data sheet' (TEDS) in our networked transducer module.The TEDS contains fields that fully describe the type,operation,and attributes of one or more transducers and its data formats are defined.It specifies a digital interface to access this data sheet,read sensor data and set actuators.A set of reading and writing logic functions to access the `transducer electronic data sheet' and transducers are defined.We also outlines the implementation of an IEEE 1451.2 compatible interface on microprocessor including system structure,calibration module and digital interface.