ISO/IEC/IEEE 21450:2010 情報技術—センサーおよびアクチュエーター用のスマートトランスデューサーインターフェース—共通機能、通信プロトコル、およびトランスデューサー電子データシート（TEDS）フォーマット | ページ 6

3.1.1

actuator

A transducer that accepts a data sample or samples and converts them into an action. The action may be completely contained within the TIM or may change something outside of the TIM.

3.1.2

address

A character or group of characters that identifies a register, a particular part of storage, or some other data source or destination.

3.1.3

AddressGroup

A collection of TransducerChannels that respond to a single address.

3.1.4

buffer

An intermediate data storage location used to compensate for the difference in rate of flow of data or time of occurrence of events when transmitting information from one device to another.

3.1.5

calibration

The process used to determine the information that resides in the Calibration TEDS to support correction.

3.1.6

ControlGroup

Manufacturer specifications that define the inherent relationships between the TransducerChannels of a multichannel TIM. This ControlGrouping information is not normally used by the TIM itself. This information is used to identify TransducerChannels that are used to control some characteristic of another TransducerChannel. For example, a ControlGroup could be used to identify an actuator that is used to set the threshold of an analog event sensor.

3.1.7

correction

The evaluation of a multinomial function using information from the Calibration TEDS together with data from one or more transducers.

3.1.8

data model

The numeric format in which the TIM shall output or accept data.

3.1.9

data set

The collection of samples acquired by a sensor (or applied by an actuator) in response to a trigger command.

3.1.10

data sheet

A set of information on a device that defines the parameters of operation and conditions of usage (usually produced by the device's manufacturer).

3.1.11

digital interface

A communications media and a protocol for transferring information by binary means only.

3.1.12

electronic data sheet

A data sheet stored in some form of electrically readable memory (as opposed to a piece of paper).

3.1.13

embedded transducer

A device that behaves as a transducer from the point of view of the NCAP even though nothing outside of the TIM is sensed or changed. Embedded transducers are useful for setting or reading operating parameters of other transducers.

3.1.14

enumeration

The assignment of a numeric value to a specific meaning within the context of a specific data field. Binary numbers are usually expressed in decimal terms for human convenience. Not all possible numeric values need to have a specific meaning. Values without meaning are declared to be unused or reserved for future use. Enumeration is the process of declaring the encoding of human interpretable information in a manner convenient for digital electronic machine storage and interchange. Any subclause that defines a TEDS data field to be enumerated shall contain a table that defines the meaning of the data field for each numeric value possible. The meanings encoded in each data field shall be specific and unique to that data field and only to that data field. The value becomes meaningless if not associated with the data field and its defining table.

3.1.15

event sensor

A sensor that detects a change of state in the physical world. The fact that a change of state has occurred and/or instant in time of the change of state, not the state value, is the “measurement.”

3.1.16

hot swap

The act of connecting or disconnecting a TIM from a transducer interface medium without first turning off the power that is supplied to the TIM over the medum.

3.1.17

least significant bit

lsb

The bit in the binary notation of a number that is the coefficient of the lowest exponent possible.

3.1.18

message

Information that is to be passed between devices as a single logical entity. A message may occupy one or more packets.

3.1.19

meta-

A Greek prefix meaning that which pertains to the whole or overall entity or that which is in common or shared with all member entities comprising the whole.

3.1.20

meta-TEDS

The collection of those TEDS data fields that pertain to the whole or overall entity or those that are in common or shared with all member entities (TransducerChannels) comprising the whole product.

3.1.21

multinomial

3.1.22

network-capable application processor (NCAP)

A device between the transducer modules and the network. The NCAP performs network communications, TIM communications, and data conversion or other processing functions.

3.1.23

not-a-number (NaN)

As defined in IEEE Std 754-1985, ¹⁰ a bit pattern of a single-precision or double-precision real number data type that is a result of an invalid floating point operation. For singleprecision real numbers, the bit pattern shall have an exponent of 255 (decimal) and a nonzero mantissa. The sign is not considered in determining whether a value is not a number.

3.1.24

octet

A group of 8 bits. (In the United States, an octet is usually referred to as a byte.)

3.1.25

packet

A block of information that is to be passed by the physical layer between devices in a single transmission.

3.1.26

sample latched

The term is used in a sensor to signal that the sample has been acquired. This may be when a sample and hold circuit switches to the hold mode or other similar operation. For an actuator, it signals that the sample has been moved to the output logic.

3.1.27

sensor

A transducer that converts a physical, biological, or chemical parameter into an electrical signal.

3.12.28

setup time

The time between the initial request for a function to be performed and when the task is actually initiated.

3.1.29

signal conditioning

The transducer signal processing that involves operations such as amplification, compensation, filtering, and normalization.

3.1.30

smart transducer

A transducer that provides functions beyond those necessary for generating a correct representation of a sensed or controlled quantity. This functionality typically simplifies the integration of the transducer into applications in a networked environment.

3.1.31

synchronization signal

For the purposes of this standard, a signal transmitted by the NCAP to provide clock or time synchronization signals to a TIM or group of TIMs. Synchronization signals are not available with all physical layer standards. Low-cost and performance TIMs may not implement a receiver for the synchronization signal.

3.1.32

transducer

A device that converts energy from one domain into another. The device may be either a sensor or an actuator.

3.1.33

transducer interface module (TIM)

A module that contains the TEDS, logic to implement the transducer interface, the transducer(s) or connection to the transducer(s), and any signal conversion or signal conditioning.

3.1.34

Transducer Channel

A transducer and all of the signal conditioning and conversion components associated with that transducer.

3.1.35

TransducerChannel number

A 16 bit number assigned to an individual TransducerChannel within a TIM by the manufacturer.

3.1.36

TransducerChannel proxy

A device that is created to allow a collection of TransducerChannels to be treated as a single entity. A TransducerChannel proxy is similar to a normal TransducerChannel except that it does not require a TransducerChannel TEDS, it cannot have a Calibration TEDS, Transfer Function TEDS, or Frequency Response TEDS. It may support other TEDS. A TransducerChannel proxy may respond to commands.

3.1.37

Transducer Electronic Data Sheet

TEDS

An electronic data sheet describing a TIM or a

TransducerChannel. The structures of multiple TEDS are described in this standard.

3.1.38

transfer

The act or process of moving information from one digital device to another.

3.1.39

transfer function

The function that defines the response of a TransducerChannel in both amplitude and frequency.

3.1.40

trigger

A signal or message that is used to start an action.

3.1.41

VectorGroup

Manufacturer specifications that define the inherent relationships between the TransducerChannels of a multichannel TIM. This VectorGrouping information is not normally used by the TIM itself. This information is normally used by NCAP applications to properly compose human readable displays or in formulating other computations. For example, VectorGroupings may be used to indicate which TransducerChannels represent each of the three vector axes of a three-axis vector measurement.

3.1.42

virtual TEDS

A TEDS that is stored permanently in a location other than the TIM.