Motorola DH6200 Specifications download pdf (Page 117)

2-105Master Glossary of Terms and Symbols

TR4.0:PROVOXRevision A — April 1997

sensor

1. A G2 object that contains one piece of

data, usually supplied by an external

source like ESDS. (See Object.)

2. A device that produces a voltage or

current output representative of some

physical property being measured (for

example, pressure, temperature, or flow).

Generally, the output of a sensor requires

further processing before it can be used

by the cont rol system.

sentence

In ASCII configuration source files, the

smallest complete unit of configuration

information, also known as a definition

sentence. Each sentence consists of a

master keyword, one or more phrases

separated by commas, and a period.

sequence control

The ENSTRUCT software function that

executes a series of functions in the

order specified. For example, a sequence

might be used to start a series of

conveyors.

serial

A procedure for transferring digital

information from one device to another as

a time-sequential bit stream, one bit after

another on a single transmission path.

Usually the transmission path is a wire or

a pair of wires, but other media can be

used. There also may be an additional

path carrying a clock signal.

HART protocol uses serial transmission.

Since the HART protocol is

asynchronous, there is no extra clock

signal.

serial batch structure

A number of sequential processes. The

simplest batch structure.

serial interface

A data transmission device through which

bits are sent sequentially.

serial interface un it

A device that lets a computer

communicate with other devices of a

PROVOXr instrumentation system, using

the data highway.

serialization of access

When two users attempt to perform the

same operation, or an operation where

the action of the first user will impact the

other, the server forces the operations to

occur in sequence (serially), rather than

in parallel.

serial loop numbering

Does not allow loop numbering to be

repeated in a particular location for an

instrument group.

server

A computer which acts a s a hub. Other

PCs extract from or upload data to this

computer. Commonly, a DBMS runs on

the server, which sto re s/re trie ves

data

into a database on the server. Data is

sent from other PCs to the server to be

stored or retrieved. Data is also sent from

the server to requesting PCs. PCs

interacting with the server are called

clients.

server name

The name of the server as it appears in

the Login box.

service transfer unit (SVXFR)

A stand-alone maintenance product

which maintains the current output to a

final control element during the

replacement of regulatory controller

cards.

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