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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

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