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SignalHeads.shtml
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SignalHeads.shtml
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
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<title>JMRI: Signal Heads Documentation</title>
<meta name="author" content="Bob Jacobsen, Egbert Broerse">
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<h1>JMRI: Signal Heads</h1>
<p>Signals Heads are how JMRI represents the individual
lights/LEDs in a signal on your layout. JMRI handles Signal
Heads as a specific kind of outputs that can be set to
various colors: Red, Yellow, Green, Flashing Yellow, etc.
Depending on the hardware used to connect your model signals
tot the DCC system, the program deploys a different technique
to turn each of these colors on or off.<br>
Signal Heads may be used to build Signal Masts using the
<a href="SignalMasts.shtml">Signal Masts Tool</a>. Depending
on the way your signals on the layout are connected to the
DCC system, Signal Heads are normally part of a Signal Mast,
but <a href=
"../../../package/jmri/jmrit/beantable/SignalMastAddEdit.shtml">
some signal hardware</a> is able to support multiple Aspects
directly, and will not require the use of individual Signal
Heads. <a name="table" id="table"></a></p>
<h3>The Signal Head Table</h3><a href=
"../../../package/jmri/jmrit/beantable/images/SigHeadTable.png"><img src="../../../package/jmri/jmrit/beantable/images/SigHeadTable.png"
align="right" width="447" height="177" hspace="0" vspace="0"
alt="Signal Head Table figure"></a>
<!-- The following section is taken from, and should be kept consistent with -->
<!-- help/en/package/jmri/jmrit/beantable/SignalHeadTable.html -->
All the Signal Heads that JMRI knows about can be referenced
using the "Signal Head Table" tool in the Tools menu of most
JMRI programs.
<p>For more information on configuring Signal Heads with the
Signal Heads Table, please see the <a href=
"../../../package/jmri/jmrit/beantable/SignalHeadTable.shtml">
Signal Head Table help page</a>. <a name="add" id=
"add"></a></p>
<h3>Creating a Signal Head</h3><a href=
"../../../package/jmri/jmrit/beantable/images/SignalHeadAdd1.png"><img src="../../../package/jmri/jmrit/beantable/images/SignalHeadAdd1.png"
align="right" width="127" height="200" hspace="0" vspace="0"
alt="Add Signal Head window figure"></a>
<p>To define a new Signal Head, click on the <a href=
"../../../package/jmri/jmrit/beantable/SignalAddEdit.shtml">Add...</a>
button at the bottom of the Signal Head Table. This will
prompt you for the Signal Head type and whatever further
information is needed for the selected type.<br>
There's more information on the <a href=
"../../../package/jmri/jmrit/beantable/SignalAddEdit.shtml">Adding
Signal Heads help page</a>.</p>
<h3><a name="edit" id="edit">Editing an Existing Signal
Head</a></h3>
<p>Click on the <b>Edit</b> button
at the right of the Signal Head Table to open the Edit Signal
Head window.</p>
<p>Once a Signal Head has been defined, its connection Type
and System Name can't be changed. You can ignore Signal Heads
that you've defined and don't use; they don't hurt anything.
If preferred you can delete a Signal Head from the Signal
Head Table by clicking the Delete button. Save a copy of the
JMRI Configuration file as a backup first and carefully read
the warning message that pops up if the Signal Head is used
by other parts of JMRI!</p>
<h3>Controlling a Signal Head</h3>Apart from manually setting
the Appearance of a Signal Head from the Signal Head Table by
clicking on the current state of a head in the Appearance column
and selecting a state from the combo box that opens,
Signal Heads can be automatically controlled by JMRI in
various ways, including:
<ul>
<li><a href="AspectSignaling.shtml">Aspect Signaling</a>,
the most versatile method to display various prototype
signaling Rule Books of many US and foreign railroads,
driven automatically by the state of Turnouts and
(Occupancy) Sensors;</li>
<li>Via <a href="../Logix.shtml">Logix</a>, a graphical way
of controlling Signal Heads with simple logic
statements;</li>
<li>By <a href="../scripting/index.shtml">Scripts</a>,
using a full programming language to do whatever you'd
like;</li>
<li>Using the <a href=
"../../../package/jmri/jmrit/blockboss/BlockBossFrame.shtml">
Simple Signal Logic</a> Tool, for basic ABS signaling of
the North American type (more easily available via the
first method).</li>
</ul>
<h2>Saving and Reloading Configuration</h2>
<p>The Signal Head information is kept in your <i>layout
configuration</i>, along with Turnouts, Lights, Sensors,
control panel setup etc.<br>
To save this information on disk, allowing to <a href=
"../../../package/jmri/jmrit/display/PanelMenuHelp.shtml">reload
it</a> next time you run JMRI, use <b>Store Configuration...</b>
in the <b>File</b> menu at the top of the Signal Head Table (or
other tables from the Tools menu), or select <b>Store
Panel...</b> in the <b>Panel</b> menu.</p>
<p>For more information on creating and displaying panels,
including how to show signals on your panels, please see the
<a href="../../apps/PanelPro/Panels.shtml">Panels pages</a>.</p>
<p>Back to the <a href="index.shtml#tools">Signaling main
help page</a>.</p>
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