GLOSSARY - TM-5-6350-275-24-P0527

TM 5-6350-275-24&P

GLOSSARY

TERM

EXPLANATION

Poll for Upsets

A request by a poller asking a remote station to return details of those points

whose values and/or states have changed since it was last polled. Details

which are returned by the remote station 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 master station, and serves as a test of the remote station's

bearer(s). The remote station is expected to reply to the poll.

Poller

An item of software in the cluster master responsible for polling a designated

range of remote stations. Up to ten can be employed at each master station.

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 master station to receive data from

a remote station.

Primary Display

A display which when created becomes a link in a chain. Primary displays

include: off-normal, alarm queue summary, and picture displays, reports,

procedures, and records.

Private Wire

A circuit used for data transmission, hired by subscribers for their exclusive

and permanent use.

Protocol

A set of conventions to ensure the compatibility of data exchange between

two computers.

Pseudo Control

A field on the status point record indicating that the point is a pseudo-point

used exclusively for control purposes.

Pseudo Data

A field on a point record indicating that the point is a pseudo-point.

Pseudo Point

A point whose state and/or value is evaluated by computing the values

and/or states of other points (either other pseudo points or real points),

rather than being acquired.

Pseudo Point Process

The process used to evaluate a pseudo point's state and/or value.

Pseudo Station

A station used for "Housekeeping Purposes"; its point states and/or values

are derived from pseudo processes, rather than being acquired from the

remote station network.

Glossary-9