The DisplayServer (DS) performs the tasks determining what is to be displayed, where and when. DS sends first information for the static layout data to the DisplayDrivers (DD), and then it sends the data content to the DDs. A DS can be connected to many DDs. There is a DD for every type of unit connected in the system.


The DisplayDrivers (DDs) connect the physical units with the DisplayServer (DS), which send static layout data and data content to the DDs. There is a DD for every type of unit from external suppliers connected in the system. Each unit’s manufacturer has typically defined its own protocol, which is then implemented in the connected DD by the DisplayAdministrator.


The addresses, types, drivers and layouts of externally supplied units are defined in the DisplayAdministrator, which is located in each DisplayDriver and connects with the external units. These parameters can all be configured while the system is operating.


The LayoutEditor, located in the DisplayDriver is used to define how the screen display to be shown to the public will appear on the externally supplied units. This operates with background layouts, windows with associated tables, static fields, dynamic fields, font choice etc.
A layout can be loaded, changed and stored in an operating system and the changes can be displayed immediately after the changed layout has been stored.


The InformationSystem is an application for announcing other information that is not directly related to a train departure. This can be an announcement such as “All rail traffic between Roskilde and Copenhagen Central Station will be suspended between 0200 and 0500 Saturday night”. When an operator wants to send an announcement, he/she must first choose a text – either by writing a new text or using and editing an existing text. He/she must then choose where to display the announcement, the period when it will be displayed, and the time it will be displayed.

Alarm management

The AlarmClient (AC) is used to show which units are unable to display information and have therefore issued an alarm. The AlarmClient can also show the individual units’ text content (mirroring). An alarm can be e.g. “Display line 4 defective” or “No communication with unit”.
The AC is used by the operator and by maintenance personnel.
The AC is set up individually for each workplace, so each operator need only concern himself or herself with what happens in the area for which he/she is responsible.
For maintenance personnel, the system can be set up to show the whole network of units in an alarm tree.

Online set-up

In the vias system, 90% of all configuration can be made online without having to restart the system to bring the changes into operation.

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