Multitech BL-Series Specifications Page 126

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System Overview
System Overview
The object of the system is to assist drivers when entering an urban area, by directing them to the most
convenient car park for their needs that has spaces available. The geographical area containing car parks
monitored by the system is typically divided into regions, so that drivers can first be directed to an area
before selecting a specific car park.
For example a city may be divided into north, south, east and west regions. On entering the city, signs will
indicate the availability of parking spaces in each region and on entering the required region signs will
indicate the occupancy of specific car parks.
The system user interface is located at the SIESPACE Instation. The Instation is used to carry out initial
setting up of equipment within the system. The system will normally run automatically, with no operator
intervention after initial setting up is complete, however it is possible for the operator to manually override
the output to signs and occupancy data of car parks under emergency conditions. It is also possible for the
operator to edit the set-up of the system. Reports can be obtained in various forms, based on data collected
by the system, and a status panel can be displayed to indicate the live operational state of the system.
Logical Elements of the System
The logical elements of the system are Car Parks, Count Sites, Zones and Signs.
Count Sites are positioned at the entrances and exits of Car Parks and pass data to the system which is
used to calculate car park occupancy. The occupancy data for one or more Car Parks is passed to a Zone.
The output from a Zone is used to set the output of a Sign.
If a Zone contains more than one Car Park then the output to the Sign will be a combination of the
occupancies or states of the member Car Parks.
Due to the uniform structure of the system where Signs are always driven by the output from a Zone, in
order to display the occupancy of an individual Car Park, it must be allocated its own Zone.
When configured to provide Driver Information the Sign may be controlled by another system connected to
SIESPACE, such as an Integrated Traffic Management Computer (ITMC) or Urban Traffic Control System
(UTC).
Physical Elements of the System
The physical system may consist of the SIESPACE Instation, Car Park Oustations, Outstation Transmission
Units (OTUs), Signs, Count Sites and Communication Systems. The system is expandable, flexible and
configurable in that different types of Sign and Count Site can be used, also communications can be by
Radio Modem, Leased Line, PSTN, or via an Urban Traffic Control System (UTC). A combination of the
types of communication can also be used in a single system.
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