GLOSSARY - TM-5-6350-275-24-P0522

TM 5-6350-275-24&P

GLOSSARY

TERM

EXPLANATION

Data Poll

A request from a master station to a remote station, to return the

values/states of all monitored points.

Data Acquisition Unit

The program within the (DAU) cluster master which is responsible for

acquiring data from remote stations.

Data Carrier Detect

The signal which is returned (DCD) by a receiving modem to inform the

transmitting modem that the carrier has been raised.

Device Data

Additional information relating to an item of hardware which may be

recorded against a point which has a device type assigned to it.

Device Type

A means of defining a point by the type of hardware it represents. A record

representing a device type is created and then assigned to a point record

using reconfiguration. Device type 252 is preset to indicate monitors, 253 to

indicate zone alarm points, and 254 to indicate portals.

Direct Printing

The process of transferring a file directly from a workstation to the

nominated printer rather than having the file placed in a queue. The printer

can be connected to either the workstation at which the request was made

or the cluster master.

Directory

A collection of related files on a disk.

Disk Drive

A hardware device used to record and retrieve data using hard or floppy

disks. The unit is equipped with read/write heads and rotates the disks at

high speed.

Display

An arrangement of data, shown on a VDU.

Duplex

A method of transmitting data within the system.

Duress

An attempt to violate the security system by forcing an authorized holder to

enter a zone against his or her will. The holder can secretly alert the system

that a duress violation is occurring by entering a special duress code instead

of the usual PIN.

Engineering Table

System records that define the operational parameters of each station and

Records

point on the system. Engineering table records consist of group, station, and

point records, timed archive records, and pseudo point processing records.

Engineering Tables

A collection of data, held as a table, giving operational information about

each station and point on the system. The engineering tables are maintained

in RAM at the cluster master and are updated by the DAU software.

Event

A significant change, usually relating to an item of equipment, which needs

to be recorded and processed.

Event Archived Data

Data which has been transferred onto disk in order to provide a record of

system events.

FEP Front End

(See Cluster Master)

Processor

Fixed Position Camera

A CCTV camera which cannot be controlled by the operator and therefore

displays only one fixed view.

Glossary-4