GLOSSARY - TM-5-6350-275-24-P0521

TM 5-6350-275-24&P

GLOSSARY

TERM

EXPLANATION

CCTV

Closed-circuit television. A system of cameras which relay views to a control

center.

Channel

A communications path through which a workstation can transmit and/or

receive data.

Class

The term used to define a point by how its condition is measured. The

system supports three classes of point: status, analog, and pulse

accumulation.

Cluster

A local resource sharing network consisting of a master workstation and up

to 22 cluster members which are interconnected by high speed data link.

Cluster Master

The central control computer within a master station which maintains the

entire range of ConversaDAQ III software together with various application

programs (such as spreadsheets, word processing, etc.) most of which are

made available to other workstations on the cluster. The cluster master is

also used to run the DAU software, which controls the acquisition of data

from remote stations. The acquired data is placed in RAM based

engineering tables where it can be viewed by any operator who is logged

into the system. Because the cluster master is the only device at the master

station that communicates directly with the remote stations, it is sometimes

referred to as the Front End Processor or FEP.

Cluster Member

A workstation on a cluster which is connected to the cluster master and,

therefore, has access to certain system services, including the operator

utilities, reconfiguration programs, and other application programs.

Command

An instruction to the system entered by a workstation keyboard.

Command Input Frame

The bottom two lines of the display in operator mode. The first line is used

to prompt for operator input and display each character typed, while the

second line displays available soft-key options.

Communication Alarms

Alarms which relate to the condition of a remote station or its bearers, rather

than to points.

Control Point

An element of remote station hardware connected to an item of equipment

that can be operated. There are various means of controlling points: these

include set point and jogging (or "inching") and controls sent directly to the

point.

ConversaDAQ Ill

A suite of software held at the cluster master which provides the entire

range of SCADA facilities.

Clear to Send

Clear to send is the signal sent by a modem to a (CTS) processor,

indicating that the communications path has been prepared and that data

can be transmitted.

Data Category

A means of defining a point by the type of data with which it deals. A record

representing a data category is created and then assigned to a point record

using reconfiguration. A maximum of 16 data category records may be held

on the system, of which data category 16 is preset to indicate a connection

with the security system.

Glossary-3