DecoderPro®

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JMRI provides powerful tools for working with your layout.

Layout Automation

JMRI can be used to automate parts of your layout, from simply controlling a crossing gate to running trains in the background.

JMRI: DecoderPro User Guide

Updating Decoder Definitions

Many people have contributed decoder definition files to DecoderPro. Between new releases, new files may be created that you might want to use. These can usually be found either on the JMRI web site or in the files area of the JMRI users Yahoo group (log in to access).

To use these xml files you need to download and install them.

The installation process was simplified in JMRI 2.3.6, where "Import Decoder File" and "Import Decoder URL" menu items were added to the Debug menu (in PanelPro or "legacy" DecoderPro) and to the File menu (in DecoderPro "Roster view").

JMRI v 2.3.6 and later

This section describes adding a new decoder definition when you are using JMRI version 2.3.6 or later.

Loading a definition from the web

If you have a URL for a decoder definition, perhaps copied from a web page or email, and your computer has an active Internet connection, you can directly install the definition. Unless there are errors, the file will be copied onto your local computer and installed in your JMRI Preferences directory.
Learn about JMRI Configuration Files

Loading a definition from a file

If you have local file containing a decoder definition, perhaps downloaded from a web page or received via email, you can install that definition in JMRI. Unless there are errors, the file will be copied into your JMRI Preferences directory and installed.

How This Works

Both of these tools take the decoder definition information from the source you indicate and copy it to your local JMRI Preferences directory so that it will be available from now on. For this to work, you can't already have a decoder definition file there by the same name. If such a file does exist, the program will indicate an error and not replace the file.

The definition is stored in your Preferences directory, instead of the JMRI distribution directory, so that installing a new version of JMRI doesn't delete it. Note, however, that if a newer version of JMRI comes along with a copy of this decoder definition installed, the program will give priority to the specific version that you imported. JMRI thinks you knew what you were doing when you specifically imported that specific version. If you'd prefer to use the one in the new JMRI version, you should delete yours from your Preferences directory and select "Rebuild Decoder Index" in the debug menu.

JMRI v 2.3.5 and earlier

This section describes adding a new decoder definition when you are using JMRI version 2.3.5 or before.

On Windows Systems

On Mac OS X Systems