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Contact:
Kang Lee

General Information:
301 975 6602 Telephone
301 990 3851 Facsimile

100 Bureau Drive,
M/S 8220
Gaithersburg, MD 20899-8220

P1451.2 Working Group

Sensor-networking is a fast growing technology. Today the transducer industry is dominated by analog transducers and interfacing these transducers to a measurement and control system is a major undertaking and very costly. Multiple control networking solutions are emerging, each requiring a separate and significant effort on the part of transducer manufacturers.

Nonetheless, networked transducers offer significant advantages to users, such as: introduction of self identification of sensors to the network or system, self-documentation, improved accuracy and reliability using digital communication, enhanced product functionality (e.g., diagnostics, multi-variable sensors, remote programmability), cost reductions in wiring and installation, in process design cycle, and in commissioning time. All these are significant contributions to productivity improvement and will benefit producers, vendors, system integrators, and users.

However, there is currently no defined common digital communication interface standard between transducers and network capable application processors (NCAPs). Each transducer manufacturer has to build its own interfaces. Transducer manufacturers currently cannot afford to support several control networks. A project designed as IEEE 1451.2, Standard for a Smart Transducer Interface for Sensors and Actuators - Transducer to Microprocessor Communication Protocol and Transducer Electronics Data Sheet (TEDS) and its Formats, is to address these issues. 


Smart Transducer Interface Module

Figure 1: An example STIM

The objective of this project is to simplify the development of networked transducers by defining the hardware and software blocks that do not depend on individual control networks. This project is to develop a standard hardware interface to connect transducers to network-capable application processors or microprocessors.

A Transducer Electronic Data Sheet and its data formats are defined to provide a standard way of describing transducers to measurement and control systems. The project defines a communication protocol for the digital interface. This protocol is used to access the TEDS, read sensor measurements and send digital settings to actuators. The digital interface is usable by all types of sensors and actuators. 

 

Figure 1 shows an example STIM, consisting of a sensor, a TEDS and associated electronics (on a small PC board) for implementing the 1451.2 digital interfaces. Figure 2 shows a block diagram of the 1451.2 Interface.
 


Block Diagram of the 1451.2 Components

Figure 2: Block Diagram of the 1451.2 Components

 

(text explanation)
Status: 
The IEEE Standards Office has approved the IEEE 1451.2 as a full-use standard, IEEE Std 1451.2 - 1997.  The standard is being revised in the working group.

 

More information about IEEE 1451.2 being revised can be found at:
http://grouper.ieee.org/groups/1451/2/