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NCE-Speedometer.shtml
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NCE-Speedometer.shtml
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<title>JMRI: Using The JMRI Speedometer with NCE</title>
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<h1>Speedometer</h1>
<h2>Using JMRI Speedometer with NCE</h2>
<h3>Installation</h3>The Speedometer function within Decoder
Pro is used to measure a train's scale speed. Once everything
is setup, the speed is automatically calculated based the
movements of an engine through distinct blocks.
<p>Each block must have a means of detecting occupancy. The
BD20 manufactured by NCE is a simple and effective block
detector. Three BD20s are recommended. As the blocks get
longer it is better to have another detector in the following
section of track to sense when the engine has entered that
block. As described at the end of this document it is
possible to use less than 3 detectors.</p>
<p>Connecting each BD20 to the NCE Command Station is
accomplished with the AIU (Auxiliary Input Unit) manufactured
by NCE as well. The AIU needs to be connected with the cab
bus. Once the AIU is connected into the cab bus, and thus
into the Command Station, Decoder Pro does the rest.</p>
<p>The track used must be connected to the mainline from the
NCE system. Do NOT connect it to the programming tracking
wiring.</p>
<p>The choice of track is up to the user and the space
available. An independent section of track or a long siding
on an existing layout are both acceptable. The independent
section of track can be long and straight or it can be a
loop. Each type has their advantages and disadvantages.</p>
<p>It is also possible to use this Speedometer while the rest
of the layout is operating. If you do, make sure you are not
blocking the mainline or at least have the proper
authorization from the dispatcher.</p>
<p>Figure 1 shows the ideal setup for connecting the block
detectors into the NCE system with the BD20s and AIU.</p>
<h3>Wiring</h3>
<p>Figure 1 shows how to integrate the sections of track,
block detectors and AIU into the Command Station.</p>
<p>Make sure there is a good solder connection between the
wire and the rail and that the rails are clean. It is
possible to have false readings on the speedometer if the DCC
signal is interrupted.</p>
<p>It is only necessary to put gaps into one of the rails. It
does not matter which rail is gapped.</p>
<p>You can use a loop of track or a straight section of
track. For a loop, block 5 in the diagram is connected to
block 1 and the power feed to block 5 can be removed since it
is powered in block 1.</p><img width="496" height="429" src=
"./images/image001.gif"><br>
It is a good idea to have 3 independent blocks. Block 2 is
used to measure speeds for slow running engines. Block 3
should be quite a bit longer than Block 2 to allow for faster
running engines to reach their running speed. The length of
each block is a subjective answer. These values are not cast
in stone and each person's experience and available space may
dictate block lengths.
<p>The BD20s should be located within a reasonable distance
from the track.</p>
<p>The wire at each block should be soldered as close to the
start of the block as possible.</p>
<p>Follow instructions for the BD-20 regarding number of
turns.</p>
<p>Follow the instructions for the AIU as well. As the AIU
instructions state, it is a good idea to change the default
cab address from 4.</p>
<p>All of the wires from each pin 1 of the BD20 must go to
GND pin on the AIU. The wires from each pin 2 on the BD20
goes to a unique pin on the AIU.</p>
<h3>Setting Up DecoderPro</h3>
<table cellpadding="0" cellspacing="0">
<tr>
<td width="13" height="0"></td>
</tr>
<tr>
<td></td>
<td><img width="415" height="284" src=
"../../../images/speedometer.gif"></td>
</tr>
</table><br>
Open DecoderPro. Under the Tools menu open Speedometer. See
Figure 2.
<ol>
<li>Enter the sensor ID number into to boxes for Sensor #1,
#2 and #3. The sensor ID number can be found by using the
following formula:
<p>Sensor ID = (AIU Cab Address - 1) * 16 -1 + (Pin
Number On AIU)</p>
<p>For example: The AIU cab address is set to 50 and one
of the BD20s is connected to pin 2. Therefore the Sensor
ID would be:</p>
<p>Sensor ID = (<b>50</b> - 1) * 16 -1 +
(<b>2</b>)></p>
<p>Sensor ID = 785</p>
</li>
<li>Based on Figure 2, all sensors should be set to
'Enter'. This means the internal timer either starts or
stops when the train enters the given block. If a sensor
were set to 'Exit' then the internal timer would start or
stop when the train exits the block.</li>
<li>The light at the end of each sensor row gives the
indication of occupancy.
<p>Red: No reading, status unknown (typically if no value
for the sensor ID is entered)</p>
<p>Yellow: Block occupied</p>
<p>Green: Block unoccupied</p>
</li>
<li>Enter the distance in scale feet. For example a 3 feet
long piece of HO flex track would be 261 scale feet.
<p>Distances 1 and 2 both start at the beginning of block
2 (or the end of block 1).</p>
<p>For metric units press the 'To Metric Units' button
and enter the information in the correct units.</p>
</li>
</ol>
<h2>Operating The Speedometer</h2>
<p>Now that everything is hooked up and the speedometer form
is open and the correct values entered as required we are
ready to use the speedometer.</p>
<ol>
<li>Place an engine in block 1.</li>
<li>Press the 'Start' button on the speedometer form to
tell it to start getting input from the AIU. All of the
lights should be gray.</li>
<li>Start the train moving towards block 2. Increase the
speed to a given speed step. Keep it at that speed.</li>
<li>As the train moves through the blocks you should notice
the colors for each sensor change colors.</li>
<li>Once the condition for sensor #2 is met, meaning the
timer for distance 1 has stopped, you should see values for
Time 1 Speed and Time displayed on the Speedometer form.
Remember this is scale speed!</li>
<li>Once the condition for sensor #3 is met, meaning the
timer for distance 2 has stopped, you should see values for
Time 2 Speed and Time displayed on the Speedometer form.
Remember this is scale speed!</li>
<li>Once the train has reached the end of the track do not
immediately throw it back into reverse. This will cause the
timer to think trains are in one of the blocks and actually
restart or give another reading for the speed and time.
Record the values of speed and time. Now move the train
back into block 1.
<p>If you have a loop, once the train has reached block 5
(actually the beginning of block 1) stop the train as
well before it reaches the end of block 1. If you don't
the timer will restart.</p>
</li>
<li>To restart the timer, make sure the train is in block
1. Hit the 'Clear' button on the Speedometer. Continue with
step 3.</li>
<li>Deciding when to switch to the longer block is up to
the user based on experience.</li>
</ol>
<h2>Uses for Speedometer</h2>
<p>Obviously the primary use for the Speedometer is to create
custom speed tables. Creating speed tables can be used so
different types of engines can run together as a consist.</p>
<p>Everyone's method for implementing a speed table may be
different. But as a starting point here is some general guide
lines.</p>
<ol>
<li>Choose an engine that has the performance you want.
Look at low and high end speeds, how it accelerates, etc.
As an alternative, manually change the speed table of an
engine until you reach the desired performance.</li>
<li>Use the speedometer to capture and document the speed
at each speed step. You can not just copy the CV value from
one engine to another. This is because the voltage one
engine requires to achieve the required speed is not
necessarily the same as another engine. This is why we're
creating the speed table using the speedometer in the first
place.
<p>Now is the time to match the other engine. This is
where programming on the mainline is the only way to go.
At each speed step document the speed of the engine.</p>
</li>
<li>Adjust the CV value at that speed step.</li>
<li>Retest the speed. Keep adjusting the CV value until the
desired speed is achieved.</li>
<li>Move on to the next speed step. Repeat steps 5 through
7 until the desired speed achieved.</li>
<li>Go through each speed step.
<p>The engine should now perform as the template
engine.</p>
</li>
</ol>
<h2>Alternate Setups For Speedometer</h2>
<h3>Using Less Than 3 Sensors</h3>
<p>If you have less than 3 sensors it is still possible to
use the Speedometer. For example, for short blocks a single
sensor can be used.</p>
<p>In this case the value on the Speedometer window for
Sensor #1 and Sensor #2 would be the same number. Sensor #1
would be set to 'Enter' and Sensor #2 would be set to
'Exit'.</p>
<p>Back to the <a href="index.shtml">Speedometer main Help
page</a>.</p>
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