Motorola DH6200 Specifications download pdf (Page 53)

2-41Master Glossary of Terms and Symbols

TR4.0:PROVOXRevision A — April 1997

EWMA

Acronym: Exponentially Weighted Moving

Average

exception

A type of unsolicited reporting: the

reporting device sends a value only if the

sample period has expired and the value

has changed significantly since the last

transmission.

exclusive OR (XOR)

A logical combination function of two

values such that if one or the other, but

not both, of the values is true (0 and 1),

then the result is true (1). If both are true

(1 and 1) or both are false (0 and 0),

however, the result is false (o).

This idea is extended to bytes in a data

block by taking the corresponding bits of

each byte, XORing them, and putting the

result in the corresponding position in a

result byte.

HART protocol uses a checksum for a

message that XORs each byte into the

previous result.

See Checksum and Longitudinal

Redundancy Check (LRC).

exit key

Pressing the EXIT key terminates user

interaction with the system and

re-displays the previously displayed

screen. The EXIT function implies that no

further data will be entered and the

information that has been previously

entered is considered complete.

The F10 key is substituted for the EXIT

key on the DEC VT220 and VT3xx

keyboards. The DIALOG key is

substituted for the EXIT key on Tektronix

4207 keyboards. A PROVUEr

multi-function key is assigned the EXIT

function when Application Window is

selected. Also, simultaneously pressing

the CTRL and Z keys is interpreted as

EXIT from most display terminals.

EXP

Abbreviation: Expected

expanded multiplexer (EMX)

APROVOXr controller that is mainly

used as a multiplexer/data acquisition

device to communicate and exchange

data with programmable logic controllers

(PLCs) and for discrete device control.

Expert System Data Server (ESDS)

Fisher-Rosemount System’s software

package that provides two-way

communications between the G2 expert

system and CHIP.

exponentially weighted moving

average ( EWMA)

A control chart in which the stability of the

process is evaluated using an

exponentially smoothed moving average.

Individual observation or su/jointfilesconvert/353575/bgroup

averages taken at earlier times are given

progressively smaller weights.

exponential smoothing

A method of forecasting based on

forming a new, smooth series by giving

weights to the original series.

export

The extraction of ENVOXr configuration

data and placing it in CDV files.

export set

CDV files prepared for import to an

ENVOXr database.

expression

A mathematical phrase which is used in a

unit operation. An expression always

follows the sequence of operand-

operator-operand. In ASCII configuration

source files, the sequence

operand-passive symbol-operand.

EXT

Abbreviation: Extended or External In a

PROVOXr device, EXT usually refers to

an External Interface card.

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