Serge NOEL
83 lines
4.6 KiB
Plaintext
83 lines
4.6 KiB
Plaintext
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta name="generator" content="HTML Tidy for HTML5 for Apple macOS version 5.8.0">
|
|
<!-- Copyright Bob Jacobsen 2008 -->
|
|
|
|
<title>JMRI: Multi-Decoder Control</title><!--#include virtual="/help/en/parts/Style.shtml" -->
|
|
</head>
|
|
<body>
|
|
<!--#include virtual="/help/en/parts/Header.shtml" -->
|
|
|
|
<div id="mBody">
|
|
<div id="mainContent" class="no-sidebar">
|
|
<h2>JMRI: Multi-Decoder Control</h2>
|
|
Originally, DCC did not provide a convenient way to program configuration values (CVs) when
|
|
you have more than one decoder installed in a locomotive. For example, if you have separate
|
|
decoders to control the motor and provide sound, and they both use the same CV locations,
|
|
programming one decoder would change the settings on the other, usually in an undesired way.
|
|
<p>There are various tricks that can be used with long and short addresses and programming on
|
|
the main, but they're not entirely satisfactory.</p>
|
|
https://www.nmra.org/dcc-working-group
|
|
https://www.nmra.org/sites/default/files/standards/sandrp/pdf/s-9.2.2_decoder_cvs_2012.07.pdf
|
|
<p>Digitrax <a href="http://www.digitrax.com/v1/LOCK.htm">proposed a method</a> for dealing
|
|
with this to the <a href="https://www.nmra.org/dcc-working-group">DCC Working Group</a>. This
|
|
was accepted by the NMRA for inclusion in " <a href=
|
|
"https://www.nmra.org/sites/default/files/standards/sandrp/pdf/s-9.2.2_decoder_cvs_2012.07.pdf">
|
|
Configuration Variables For Digital Command Control, All Scales</a>, and has since been
|
|
adopted by many manufacturers.</p>
|
|
|
|
<p>The method uses CV15 and CV16 to control writing and reading CV values. Before the
|
|
decoders are installed in the locomotive, each one has a specific value programmed into CV16.
|
|
(The recommended values are 1 for the motor decoder, 2 for a sound decoder, 3 for a
|
|
function-only decoder, and 4-7 for other uses; decoders are supposed to ship with a value of
|
|
0 in both CV15 and CV16) A decoder will only do read and write operations if the values in
|
|
CV15 and CV16 are the same, with the exception that you can always write CV15. In effect,
|
|
CV16 is a lock and CV15 is the key.</p>
|
|
|
|
<p><a href="../../../../images/DualDecoder.jpg"><img src="../../../../images/DualDecoder.jpg"
|
|
width="122" height="306" class="floatRight" alt="Dual Decoder Window"></a> DecoderPro has a
|
|
"Multi-Decoder Control" to make use of this feature easier. You can open it from the
|
|
"Programmers" selection in the "Tools" menu. This opens a window, which you can also see on
|
|
the right of this page.</p>
|
|
|
|
<p>The top section of the window consists of eight radio buttons. Clicking the buttons
|
|
numbered 0 to 6 will unlock the decoder with the corresponding number in it's lock CV (CV16).
|
|
DecoderPro then reads back the value in CV16 to confirm that the decoder has successfully
|
|
unlocked.</p>
|
|
|
|
<p>Normally, one clicks the button for the decoder you want to program, and them moves over
|
|
to the main DecoderPro window to read and write values.</p>
|
|
|
|
<p>The "Legacy" button writes a 7 to CV15, which is another special case. Many decoders,
|
|
especially older models, do not have this locking mechanism present. In some cases, most
|
|
specifically a Digitrax FX3 or later decoder and an early SoundTraxx decoder, it's possible
|
|
to emulate the lock using sequential writing of CVs. Clicking the "Legacy" button activates.
|
|
Unfortunately, it's not an entirely reliable method.</p>
|
|
|
|
<p>In the middle section are there buttons that can do more complicated operations.</p>
|
|
|
|
<p>The "Search" button sequentially works through the possible addresses, marking those
|
|
decoder addresses that are found to be present.</p>
|
|
|
|
<p>"Reset" works through the possible combinations to unlock a decoder that has been
|
|
inadvertantly locked. This should only be used if you have just one decoder in the
|
|
locomotive. If you have more than one, it will unlock all of them, which may cause confusion
|
|
later.</p>
|
|
|
|
<p>"Init DH163 + Soundtraxx" configures the "Legacy" mode discussed above.</p>
|
|
|
|
<p>Below that, the program displays status messages.</p>
|
|
|
|
<p>The bottom section allows you to directly set the programming mode in use. If you're using
|
|
ops-mode programming (programming on the main), you wil also need to specify the address of
|
|
the locomotive being programmed.</p>
|
|
<!--#include virtual="/help/en/parts/Footer.shtml" -->
|
|
</div>
|
|
<!-- closes #mainContent-->
|
|
</div>
|
|
<!-- close #mBody -->
|
|
<script src="/js/help.js"></script>
|
|
</body>
|
|
</html>
|