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12 Indicators and Semi-Automatic Control
With the mechanisms outlined in this chapter you can extend manual control to semiautomatic
control of your layout with switchboards. Additionally some of the mechanisms
explained here can be applied to the Visual Dispatcher or can be used to influence
automatic control individually.
This is the reason why they are discussed in a separate chapter.
12.1 The Memory of Indicators
In the simplest case, an indicator is automatically turned on and off by the associated
track contact or occupancy sensor (see chapter 4, “Contact Indicators”). Additionally,
indicators provide a memory in which the event, that has occurred, can be “stored” for a
longer period. This possibility is especially useful to prevent an indicator from unwanted
flickering during automatic operation (see below).
For this purpose you can select one of the following methods to turn off the indicator:
• Automatic: this is the default method. In this case the indicator is automatically
turned on and off by the associated track contact or occupancy sensor.
• Manual: in this case, the indicator remains turned on until you turn it off – by
clicking to it with the mouse.
• Timer: in this case, the indicator remains turned on for a certain period. This can be
used to reset a signal a few seconds after a train has passed it.
• By Train: if this option is selected, then the indicator remains turned on until a train
has passed the associated track contact or occupancy sensor or another point on your
layout. With this option it is for example possible to use a momentary track contact
for Virtual Occupancy Indication.
• By Indicator: if this option is selected, then the indicator remains turned on until
another indicator is turned on.
• Toggle: if this option is selected, then the indicator is alternately turned on and off.
With this option, it is possible to create a track occupancy detector with two
momentary track contacts. This is explained in more detail in the example on page
186 “Simple Track Occupancy Detection”.