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PR2.shtml
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<meta name="generator" content=
"HTML Tidy for Mac OS X (vers 31 October 2006 - Apple Inc. build 15.17), see www.w3.org">
<title>JMRI Hardware Support - Connecting to a Digitrax
PR2</title>
<meta name="author" content="Bob Jacobsen">
<meta name="keywords" content=
"Digitrax Chief DCS Command Station MS-100 LocoBuffer java model railroad JMRI install windows">
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<h1>Hardware Support: Connecting to a Digitrax
PR2</h1><a href=
"http://digitrax.com/prd_compint_pr2.php"><img src=
"images/PR2.jpg" alt="PR2 picture"></a><br>
The PR2 is a standalone programmer that can be used to set
CV's in all decoders that DecoderPro supports. It can also be
used to download sound information into Digitrax sound
decoders and, within its limited current capability, run one
locomotive to test it.
<p>To use it, you connect it to its power supply and to a
dedicated piece of track which you'll use for a programming
track. Also, connect the 25 pin RS232 connector to a serial
port on your computer. You may have to use a USB to serial
adapter, and/or a DB25 to DB9 connector adapter (The PR2 has
a standard RS232 25 pin connector; most computers now have a
9 pin RS232 connector, and there are simple adapters
available to convert the wiring.)</p>
<p>The PR2 is not a LocoNet® interface, and does not
connect to the LocoNet on your layout in any way. It cannot
attach to a command station like the MS100, PR3, LocoBuffer,
LocoBuffer-II, and LocoBuffer-USB do. The cable that comes
with the PR2 is not a LocoNet cable, and you should not plug
a LocoNet cable into the PR2.</p>
<p>For more information on the PR2 itself, please see the
<a href=
"http://www.digitrax.com/products/computer-control/pr2/">Digitrax
PR2 page</a> and the <a href=
"http://www.digitrax.com/tsd/product/PR2/">PR2 support
page</a> in the <a href=
"http://www.digitrax.com/tsd/">Digitrax Tech Support
Depot</a>.</p>
<h2>Recommended setup</h2>
<p>To set up DecoderPro to use the PR2:</p>
<ul>
<li>Start DecoderPro.</li>
<li>Open the Preferences window from the Edit menu and
configure the connection by selecting the Connections item
at left and:
<ul>
<li>Select Digitrax as the Manufacturer</li>
<li>Select the PR2 as the Connection</li>
<li>Select the serial port that's connected to the
PR2</li>
<li>The speed will be fixed at 57,600 baud; don't try
to change this in your computer's settings</li>
<li>The "Flow Control" option defaults to "Use Hardware
Flow Control", which uses the status leads in the
serial connection to determine when the PR2 is ready to
send and receive. You should try that first, as it is
the most reliable mode. Only if you can't program
decoders using that choice, and only after checking
that you're using the right port, should you select
"None" for this Preference field and try again.</li>
</ul>
</li>
<li>Click Save at the bottom of the Preferences pane, quit
the program and restart.</li>
</ul>
<h2>Usage suggestions</h2>
<p>You can use a JMRI throttle to control the locomotive
connected to the PR2. Use the JMRI Power Control or the
"Power" menu item on the Throttle's menu bar to turn on track
power, and then you can operate the locomotive normally.</p>
<p>The PR2 can only provide very limited current, so Digitrax
has built a "neutral mode" into their sound decoders. When
JMRI and the PR2 is running a Digitrax sound decoder, the
motor is disconnected to reduce the current load. You can
still ramp the speed up and down with the throttle and listen
to how the sound responds, but the motor won't move the
locomotive.</p>
<p>Other decoders, including decoders from other
manufacturers, may draw enough motor current to trip the PR2
internal circuit breakers. This will cause JMRI to mark track
power as "off". Just wait a couple seconds and turn the track
power back on to recover.</p>
<p>LocoNet® is a registered trademark of <a href=
"http://www.digitrax.com">Digitrax, Inc.</a></p>
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