Serge NOEL
76 lines
3.8 KiB
Plaintext
76 lines
3.8 KiB
Plaintext
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<title>JMRI Hardware Support - Signals with C/MRI</title>
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<meta name="author" content="Bob Jacobsen">
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"Bruce Chubb C/MRI Computer interface java model railroad JMRI signals">
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<h1>Hardware Support: Chubb C/MRI</h1>
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<h2>Signals with C/MRI</h2>
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<p>For model signals with separate Red/Yellow/Green diodes, the situation is simple: Connect
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each one to a separate output with the proper polarity, have PanelPro drive those three
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outputs, and it will Just Work. The "Triple Output" type of Signal handles this type of
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wiring.</p>
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<p>For model signals with just Red and Green diodes, there are two ways of wiring them:</p>
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<ol>
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<li>The diodes have one common connection, plus one lead for powering each diode. This is
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the so-called "three lead" type. Note that there are still just two diodes here, but there
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are three leads to wire.</li>
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<li>The diodes are wired back to back. This is the so-called "two lead" type</li>
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</ol>
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<p>In both cases you wire these to two C/MRI outputs. There are a couple of extra resistors,
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and perhaps an external power supply involved, so that when one of the C/MRI outputs is
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activated, power is applied to one diode and it lights, and when the other is activated the
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other diode gets power. That makes Red and Green. The "Double Output" Signal type handles
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this.</p>
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<p>To get Yellow, you have to power both LEDs. This is easy with wiring (1.) above; the
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program just activates both of the outputs, both LEDs make light, and the Red and Green
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combine to make Yellow.</p>
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<p>With wiring 2., you can't simultaneously light both LEDs, since current can't flow in two
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directions at the same time. But "at the same time" is the key; just alternate the direction
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of the current Very Fast, too fast for the eye to see, and the colors will merge into Yellow.
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There are two ways to do this:</p>
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<p>2.A) Use an external circuit. There's a signal driver board to do this what connects
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between the C/MRI outputs and the LED leads. When it detects that _both_ outputs are on, it
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rapidly alternates the voltage to the LEDs, making yellow. This circuit can be used with any
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C/MRI system type, and you don't have to tell PanelPro anything to make it work.</p>
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<p><a href="images/CMRIConfigNodesSMINI.png"><img src="images/CMRIConfigNodesSMINI.png" alt=
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"Config Pane" class="floatRight" height="202" width="218"></a> 2.B) Use support built into
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the SMINI card. An SMINI card can be configured to do a similar thing. When the SMINI detects
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the two outputs are on, it alternates the voltage. To configure this, you have to go to the
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PanelPro Preferences, click on "Configure C/MRI nodes" (or select it from the
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<strong>CMRI</strong> menu), select an SMINI to configure, and click on one of the little
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check-boxes to configure a specific output as "two lead oscillating signal". Click "Edit
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Node" to update, then close that panel, click "Save" and restart the program. Once this is
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done, a "Double Turnout" signal type will also generate yellow signals on those outputs.</p>
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<p>Back to the <a href="CMRI.shtml">C/MRI Hardware Support Help page</a>.</p>
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