GLOSSARY - TM-5-6350-275-100220

TM 5-6350-275-10

GLOSSARY

TERM

DEFINITION

Personal Identification Number. If a PIN is included on the holder record, it must be

keyed in whenever the holder presents an access card to a reader unit, thus providing

additional protection against system violation.

Point

A general term describing an element in the system for which a value or state is to be

calculated or acquired. There are two point types (pseudo and real) which can be used

to store one of three data classes: status, analog, or pulse accumulation.

Point Failure

The condition where a RADC has failed (or is unable) to return readings from one or

more points in response to a poll. A point failure usually implies that a board in the

RADC, used to interface the equipment being monitored and/or controlled, has failed.

Point Summary

A display containing a list of points and their current value and/or status.

Poll

A request by a PMC for a RADC to return data about the equipment being monitored.

There are two poll types: upset poll and data poll.

Poll for Data

A request by a poller asking a RADC to return data about all of its associated points.

When the data is received, it is put in the system database. The poll is designed to

ensure that the database always gives a true reflection of the equipment being

monitored. It is of particular importance when a RADC has been powered down for

maintenance purposes. It also serves to test the communications bearer(s), since the

RADC concerned is expected to reply. Due to the amount of data that can be returned

by a RADC, this poll takes longer to complete than a poll for upsets.

Poll for Upsets

A request by a poller asking a RADC to return details of those points whose values

and/or states have changed since it was last polled. Details which are returned by the

RADC include the current values and/or states of points concerned, and are entered into

the system database. The poll usually occurs more frequently than a data poll and takes

less time to complete. It is designed to enable changes in plant status to be reported

quickly to the PMC, and serves as a test of the RADC's bearer(s). The RADC is

expected to reply to the poll.

Poller

An item of software in the PMC CPU responsible for polling a designated range of

RADCs. Up to ten can be employed at each PMC.

Portal

Any kind of entry (for example, door, turnstile, etc.) into a security zone. Portals are the

only usual means of access into security zones and can be used only by authorized card

holders.

Prefix

The first part of a point mnemonic, consisting of up to four alphanumeric characters.

Preset

A pre-defined scene which can be selected for display on a monitor using the CCTV

command.

Primary Access Level

The default access level used when secondary and temporary access levels are not in

force.

Primary Bearer

The bearer which is normally used by a PMC to receive data from a RADC.

Glossary-8