Multitech BL-Series Especificaciones descargar pdf (Pagina 90)

Car Parks - Overview

A car park is defined as an area with entrances and exits monitored by count sites. Data from the count sites

are used to determine the occupancy of the car park.

During normal operation the car park is defined as having one of three states of occupancy:

● Spaces

● Almost Full

● Full

Outside normal operation the car park can have two more states:

● Closed (Set by an operator, or by timetable)

● Faulty (Set by the system if a fault is detected in the car park or count site)

The state of a car park is determined by comparing the occupancy state with a set of thresholds:

● Almost Full Increasing

● Full Increasing

● Almost Full Decreasing

● Spaces Decreasing

The reason for having separate increasing and decreasing thresholds for Almost Full is to introduce

hysteresis into the system so the occupancy does not hunt between Spaces and Almost Full. If possible the

Almost Full increasing threshold is set lower than the Almost Full decreasing threshold to a level where the

system is stable. The capacity of the car park is also defined and for the same reason it is advisable to set

the Full threshold lower than capacity. If it is impossible to stabilise the system using the thresholds, as in

the case of very low capacity carparks, a change of state delay can be introduced. This is a delay specified

in minutes, that can be placed between Full to Almost Full, and Almost Full to Spaces.

The status of the car park is passed to any Zones to which it is assigned. The Zone in turn passes the

information to a Sign so the information can be displayed. The car park can be assigned to more than one

Zone. It may be assigned to a Zone with other car parks, so that the occupancy af an area cotaining several

car parks can be determined and displayed on a sign. An individual car park can also be assigned to a

Zone, in order to display it’s own occupancy (see

Zones - Overview).

A car park can be added to the system by means of the user interface (see Equipment Definition button).

The configuration and occupancy details can also be viewed and edited by selecting the appropriate

equipment icon on the overview map (see User Interface/Equipment Icons on the Overview Map).

file:///A|/html/lert573n.htm [27/06/2001 20:47:04]

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 125 126

Sin comentarios

Multitech BL-Series Especificaciones Pagina 90