Decoder for Atlas N Scale H15/16-44 Locomotives
1
The #520099 DCC decoder is designed for Atlas N scale H15/1644 locomotives. The characteristics of this decoder are:
∗ Provides 0.5A continuous motor current.
∗ Has two function outputs with built-in white LED headlights that can be
configured for special effects including directional, independent, dimming,
Mars light, Gyro light, single Strobe, and double Strobe.
∗ Provides two additional function outputs with built-in bi-color LEDs that
provide directional green or red marker lights at front and rear and can be
configured for on/off control by a specified DCC function.
∗ Supports both short (2-digit) and long (4-digit) addressing.
∗ Supports advanced consist control (lashing up locomotives that have
different DCC addresses)
∗ Operates on conventional DC layouts; this feature may be disabled by
setting a CV.
∗ Provides full support for all forms of programming that are described in
NMRA RP-9.2.3.
∗ Supports both short form instructions and long form instructions in
operations mode programming (programming on the main line)
∗ Can be set for operation with 14/27 speed-steps, 28/55 speed-steps, or 128
speed-steps with direct drive.
∗ Can choose either Precision Glide Control or Silent Drive for motor control
DCC Decoder for Atlas N
Scale H15/16-44
Locomotives
Item # 520099
Revised 09/14/2004
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives 2
N Scale H15/16-44 DCC Decoder
The N-scale H15/16-44 DCC decoder can be used with all popular
NMRA-compliant DCC systems. This decoder is in full conformance with
all NMRA Standards and Recommended Practices and has been
augmented to work well with all major DCC systems on the market.
The N scale H15/16-44 decoder is packed with all the features that you
expect in a high-end decoder:
• Special lighting effects for front and rear headlights including
directional, independent, dimming, Mars light, Gyro light, single
Strobe, and double Strobe.
• Directional bi-color (green and red) front and rear marker lights.
• Supports both short (2-digit) and long (4-digit) addressing.
• Advanced consist control (operating and controlling several
locomotives as if they were a single entity by sending speed and
direction commands to a common consist address that is stored in
the decoder of every locomotive in the consist).
• Operations mode programming (programming on the main line).
•
Full support for all the various motor speed-step modes, including
the 128 speed-step mode
•
Choice of either Precision Glide Control or Silent Drive for motor
control.
Many characteristics of the H15/16-44 decoder can be programmed to
customize the decoder to its locomotive. Please read The Configuration
Variables and their Definitions section for details on the configuration
variables supported by the H15/16-44 decoder. The H15/16-44 decoder
supports all forms of programming described in NMRA Recommended
Practice 9.2.3, including the user friendly direct CV (Configuration
Variable) programming mode and operations mode programming. For
example, you can operate the decoder with the factory-default speed
curve, or you may specify your own customized speed curve. You can
also set which end of the locomotive is to be the forward end. You can
even decide whether or not you want to be able to operate the
locomotive on conventional DC layouts. If your DCC system supports
operations mode programming, you can change the values of all CVs
(except for the locomotive’s 2-digit, 4-digit, and consist addresses
in CV1, (CV17 and CV18), and CV19; respectively) while the
locomotive is on the main line.
.
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives
3
Lighting Options for the H15/16-44 Decoder
The H15/16-44 decoder has four function outputs: A, B, C, and D.
Decoder outputs A and B are designed to control the white LEDs used
for the front and rear headlights, respectively, in these locomotives. The
front and rear headlights can be configured by Bit 0 in CV51 to be either
directional or independently controlled. It is also possible to dim, using a
DCC function, either directional headlights or independently controlled
headlights.
If the headlights are configured for independent control, the front
headlight may be configured with the appropriate bits in CV51 to operate
as a Gyro light, a Mars light, a single pulse Strobe light, or a dual pulse
Strobe light. Similarly, when the headlights are configured for
independent control, the rear headlight may be configured with the
appropriate bits in CV57 to operate as a Gyro light, a Mars light, a single
pulse Strobe light, or a dual pulse Strobe light.
Decoder outputs C and D are designed to control the bi-color LEDs
used for the front and rear marker lights in these locomotives. Decoder
outputs C and D are auto-reversing so that the bi-color LEDs show
green in the direction that the locomotive is traveling and red in the
opposite direction. The only control over these marker lights is on or off.
By default, function F2 is used to turn these lights on or off. If desired,
this default setting can be changed simply by modifying CV54; by writing
the proper value into CV54, the marker lights can be switched on or off
by any function F1 through F8. If you are using a DCC system where
function F2 is momentary (e.g., Digitrax), it is recommended that you
remap F2 to another function with on/off control.
If you are using an NCE Power Pro DCC system, you will need to
change the values of two parameters in your command station to get
proper operation of the H15/16-44 directional marker lights. The Number
of Temp Packets must be changed from 5 to 8, and the Function Repeat
Rate must be changed from 0 to 250. Refer to the NCE System
Reference Manual for instructions on how to change the values of these
parameters.
The H15/16-44 decoder comes with two white LED
headlights and two bicolor marker light LEDs already
installed. The light outputs of this decoder are designed
only to drive these four LEDs. The Atlas warranty is void if
any of these LEDs are removed from the H15/16-44 circuit
board.
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives 4
Silent Drive or Precision Glide Control
The H15/16-44 decoder provides an option to use either Silent Drive or
Precision Glide Control for motor control. Silent Drive is best for
coreless motors and for applications were you want absolutely silent
operation. Precision Glide Control provides much more precise slow
speed operation because it pulses the motor to ensure the friction of the
motor and drive train does not interfere with the operation. The default is
Precision Drive Control. The motor control selection is made using
CV50.
Preparing to Install the H15/16-44 Decoder
Before installing the H15/16-44 decoder in your locomotive, it is
necessary to test (and adjust, if necessary) the locomotive for proper
operation on conventional DC power. Replace any worn out parts, such
as brushes. Also clean any dirt or oxidation from the wheels and pickups
to insure that electrical contact is good. Now is also a good time to
lubricate your locomotive. A locomotive that runs well under
conventional DC will also run exceptionally well under DCC.
Precautions to Take When Installing the Decoder:
Although the H15/16-44 decoder has many internal safeguards to
prevent damage, you must not allow any metal part of the locomotive to
touch surface components of the decoder other than the pickup pads on
the decoder that connect to the wheel-sets, the headlights, and the
motor. Any contact to other parts of the decoder can cause a direct
internal short circuit and destroy the DCC decoder.
The H15/16-44 decoder is not completely protected against static
electricity and has sensitive electronic parts. When installing this
decoder in your N scale locomotive, it is recommended that you wear a
grounded anti-static wrist strap. Also be careful in handling the decoder,
especially in the area around the top rear part of the decoder (the area
where the microprocessor is located).
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives
Step by Step Installation
Figure 1: Installing the H15/16-44 decoder
In the following steps, please refer to the instructions provided with your
Atlas locomotive.
1) Remove the locomotive's body shell and fuel tank. Use care so as
not to damage any of the fragile parts.
2) Loosen the two screws that hold the frame together; these screws
are located at the front and rear of the frame.
3) Carefully remove the lighting control circuit board, which is located
at the top of the frame.
4) Place the decoder between the two halves of the frame so that the
two motor contact pads are at the bottom of the decoder and will
press firmly against the two copper contact strips from the motor
when the decoder installation has been completed. In the
photograph of the bottom of the H15/16-44 decoder on the first
page, these motor contact pads are the two rectangles in the
narrow center portion of the circuit board.
5) Carefully press the two frame halves together, with the sides of the
decoder inserted into the notches in the two halves of the frame.
Some pressure is needed to press the two frame halves together.
This pressure fit insures good electrical contact between the frame
and the decoder.
6) Tighten the two screws that hold the locomotive frame together.
7) Carefully check to make sure that the motor contact strips are not
touching either half of the frame. It is necessary to look down from
the top through the frame cutouts to check for such unwanted
shorts.
There must be NO electrical contact between the motor
contacts and any part of the frame
Place the locomotive (without its body shell) on your DCC programming
track and read back the locomotive's address from the decoder. If the
decoder is properly installed, you will be able to read back the factory
pre-set address 03. If your DCC system does not support reading
Atlas Model Railroad Co., Inc.
5
Decoder for Atlas N Scale H15/16-44 Locomotives 6
decoder properties, observe carefully the decoder's behavior while on
the isolated programming track. Each time you try to program the
decoder you can see the acknowledgement that is sent by the decoder
in the form of a brief and minor jerk of the locomotive. A successful
acknowledgement means that you have installed the decoder correctly.
Remove the locomotive from the programming track and, if necessary,
correct any installation errors. Once you have successfully programmed
the decoder, reinstall the body shell and retest the locomotive on the
programming track. If this test is successful, the locomotive is ready to
use.
Programming the H15/16-44 Decoder
The H15/16-44 decoder supports all forms of both service mode
(programming on an isolated programming track) and operations mode
programming (programming on the main line). Using any of these
programming methods, many features (such as the locomotive's
address, acceleration, and configuration) can be customized to the
individual locomotive in which the decoder is installed. These
customized properties will be saved in non-volatile memory locations on
the decoder so that they will retain their values even after power has
been removed. All parameter values are set electronically, which means
that the locomotive does not need to be opened again after the decoder
has been installed to read or modify the values of these so-called
Configuration Variables (CVs). The H15/16-44 decoder has a total of
128 CVs. Not all of them are used at this time because many have been
reserved for future use.
Any NMRA-compliant DCC Command Station, such as the Atlas Master
Commander, can be used to program the H15/16-44 decoder. With
several entry-level systems, only CV #1 (the locomotive address) can be
set unless you use a separate DCC programmer. More advanced DCC
systems, including the Atlas Commander, support the ability to set many
more CVs. The H15/16-44 decoder supports all programming modes
and can be programmed by all NMRA-compliant DCC systems. The
locomotive’s 2-digit and 4-digit addresses in CV1, CV17, and CV18
CANNOT be programmed in operations mode. Instructions for
reading and writing CVs are given in the user manual of your DCC
system.
Note: for newly programmed CV values to take effect after service
mode programming, the decoder must go through a power reset. If
your DCC command station does not support automatic power
reset, simply rock the locomotive off the track after programming.
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives
7
Configuration Variables and their Definitions
The H15/16-44 decoder supports a full range of features, which are
activated by setting Configuration Variables. All CVs are numbered.
These numbers are used during programming and are identical for all
decoders that conform to NMRA standards, regardless of the decoder
manufacturer. The following table lists the CVs supported in the H15/1644 decoder. Both CV numbers and Register numbers are provided for
cross-reference.
Some CVs (such as CV29) have specific meanings for each bit. To
conform to the NMRA convention for bit numbering, the CV bit
assignments shown in this table use the bit-numbering scheme of 0 to 7.
Table 1: Configuration Variables (CVs) for the
H15/16-44 Decoder
CV Reg. Description Range Default
1 1 Short address:
This is the number that you enter into your DCC
system to tell it which locomotive you wish to run
with a short (2-digit) address.
2 2 Start voltage:
This is the voltage applied to the motor in speed
step 1. Set this value so that the locomotive is
barely moving in speed step 1.
3 3 Acceleration Momentum:
Determines the rate of change of speed upon
acceleration. A higher value leads to a slower
acceleration.
4 4 Brake Momentum:
Determines the rate of change of speed upon
braking. A higher value leads to longer braking
distances.
- 5 Contains CV29 (see definition of CV29 below)
- 6 Page Register:
Normally this Register is not modified directly by
a user. For correct operation, R6 should be set to
have the value “1” after any use.
7 7 Version Number:
This location stores the version number of the
decoder. This CV is read-only.
1-99 3
0-31 8
1-255 1
1-255 1
0-55 6
0-127 1
- 46
Value**
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives 8
CV Reg. Description Range Default
Value**
8 8 Manufacturers Identification:
17
18
19
29 Decoder Configuration, Byte 1:
This value is the manufacturer ID of the decoder,
(Atlas=127). Writing the decimal number “33”
to this Register will reset all CVs in the
decoder to their factory-default values
EXCEPT FOR the speed step settings in CV67
to CV94.
-
Long Address, High Byte
The long (also called extended) address, if used,
is contained in CV17 and CV18.
-
Long Address, Low Byte
-
Advanced Consist Address
The Advanced Consist address, if used, is
stored in CV19.
Several decoder properties are set with CV29. Changes
are easiest if done in binary mode, but can also be done
by adding together the decimal values (shown in
parenthesis) for all the desired features and writing the
total into CV29. (For an example, see the section
Converting Binary Values of Individual Bits within a
Configuration Variable into the Equivalent Decimal Value
of the Entire CV.)
The definitions for the individual bits of CV29 are given
below.
Bit 0
Locomotive direction:
This bit sets the direction that the locomotive will
move when told to move forward in digital (DCC)
mode.
0 = locomotive’s direction is normal
1 = locomotive’s direction is reversed
- 127
192231
0-255 0
1-99 0
0-55 6
0,1 0
0
(1)
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives
CV Description Range Default
Value**
29
Bit 1
Headlight mode:
0 = Operation with 14 or 27 speed-step
systems. This setting must be selected when
the locomotive decoder is used with any
DCC system that does not support the 28
speed-step mode. If the headlights turn on
and off as the speed is increased, the
command station is configured for 28 speedsteps, and the decoder is set for 14 speedsteps.
1 = Operation with 28, 55 or 128 speed
steps. If you use this setting, the Command
Station must also be configured to use either
the 28 speed-step mode or the 128 speedstep mode; otherwise, the headlights cannot
be controlled.
Bit 2
Usage on conventional DC layouts:
0 = locomotive operates only in digital (DCC)
mode
1 = locomotive can operate in either analog
(conventional DC) or digital (DCC) mode
Bit 3 Always 0 0 0
Bit 4
Speed curve:
0 = Factory-default speed curve is used
1 = User-defined speed curve is used.
Please enter the appropriate values into CVs
67 to 94 before setting this bit.
Bit 5
Bit 6
50 Decoder Configuration, Byte 2:
Bit 0 Not used 1
2-digit or 4-digit Addressing:
0= Short (2-digit) address used
1= Long (4-digit) address used
Not used
Bit 7
Both bits always 0
CV50 is similar to CV29, but CV50 is used to set
other properties. The definitions for the individual bits
of CV50 are given below.
Not used.
Bit 1
0,1 1
(2)
0,1 1
(4)
0,1 0
(16)
0,1 0
(32)
0
0 - 12 1
0
9
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives 10
CV Description Range Default
Value**
50
Bit 2
Brake momentum on DC operation.
Used to achieve prototypical braking at red
signal indications if conventional DC control
is disabled. (CV29.2 = 0*)
0 = locomotive proceeds with track-voltage-
dependent speed inside the conventional DC
section.
1 = locomotive brakes in the conventional DC
section with preset brake momentum.
Bit 3 Motor Drive Selection
Bits
51 Lighting Effects for Output A (front headlight)
Bit 0
Bit 1
Bit 2
Bit 3 Not used 0
0 = Precision Glide Control
1 = Silent Drive
Not used 0
4-7
Directional or Independent Headlights:
0 = Headlights are directional.
1 = Headlights are independent per Rule
17, with F0 controlling front headlight and F1
controlling rear headlight.
Front Headlight Dimming Control:
If CV51.2=1, the value in CV52 is used for
front headlight dimming with the dimming
controlled as follows:
CV51.1=0: Front headlight always dimmed
CV51.1=1: If CV51.0=0, function F1 dims
front headlight; if CV51.0=1, function F4 dims
front headlight.
Dimming of Front Headlight:
0 = Front headlight cannot be dimmed
1 = Front headlight can be dimmed
0,1 0
(4)
0,1 0
(8)
0-247 6
0,1 0
(1)
0,1 1
(2)
0,1 1
(4)
Bit 4 0 = No effect
1 = Front headlight functions as Gyro light
Bit 5 0 = No effect
1 = Front headlight functions as Mars light
Bit 6 0 = No effect
1 = Front headlight functions as single pulse
Strobe light
Bit 7 0 = No effect
1 = Front headlight functions as double pulse
Strobe light
0,1 0
(16)
0,1 0
(32)
0,1 0
(64)
0,1 0
(128)
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives
CV Description Range Default
Value**
Notes for CV51:
51
Bits 4 to 7 of CV51 are effective if and only if CV51.0=1.
Dimming is inactive if any of bits 4 to 7 are set to “1.”
If more than one of Bits 4 to 7 of CV51 is set to “1,” only the highest
numbered of these bits is effective.
52
Dimming for Output A (front headlight)
The value in CV52 is used to dim the front headlight.
Using the value “0” for this CV results in a completely
dark front headlight, when it is dimmed.
Using the value “255” keeps the front headlight at its
maximum possible brightness, even when dimmed.
54
Function Mapping for Outputs C and D (front and
rear marker lights)
Bit 0
0 = No effect
1 = Marker lights controlled by F1
Bit 1
0 = No effect
1 = Marker lights controlled by F2
Bit 2
0 = No effect
1 = Marker lights controlled by F3
Bit 3
0 = No effect
1 = Marker lights controlled by F4
Bit 4
0 = No effect
1 = Marker lights controlled by F5
Bit 5
0 = No effect
1 = Marker lights controlled by F6
Bit 6
Bit 7
57 Lighting Effects for Output B (rear headlight)
Bit 0 Not used 0
Bit 1
Bit 2
0 = No effect
1 = Marker lights controlled by F7
0 = No effect
1 = Marker lights controlled by F8
Rear Headlight Dimming Control:
If CV57.2=1, the value in CV58 is used for
front headlight dimming with the dimming
controlled as follows:
CV57.1=0: Rear headlight always dimmed
CV57.1=1: If CV51.0=0, function F1 dims
rear headlight; if CV51.0=1, function F4 dims
rear headlight.
Dimming of Rear Headlight:
0 = Rear headlight cannot be dimmed
1 = Rear headlight can be dimmed
0-255 64
0-255 2
0,1 0
(1)
0,1 1
(2)
0,1 0
(4)
0,1 0
(8)
0,1 0
(16)
0,1 0
(32)
0,1 0
(64)
0,1 0
(128)
0-246 6
0,1 1
(2)
0,1 1
(4)
Atlas Model Railroad Co., Inc.
11
Decoder for Atlas N Scale H15/16-44 Locomotives 12
CV Description Range Default
Value**
Bit 3 Not used 0
57
Bit 4 0 = No effect
Bit 5 0 = No effect
Bit 6 0 = No effect
Bit 7 0 = No effect
58
67
to
94
128 Decoder Software Version – read only
1 = Rear headlight functions as Gyro light
1 = Rear headlight functions as Mars light
1 = Rear headlight functions as single pulse
Strobe light
1 = Rear headlight functions as double pulse
Strobe light
Notes for CV57:
Bits 4 to 7 of CV57 are effective if and only if CV51.0=1.
Dimming is inactive if any of bits 4 to 7 are set to “1.”
If more than one of Bits 4 to 7 of CV57 is set to “1,” only the highest
numbered of these bits is effective.
Dimming for Output B (rear headlight)
The value in CV58 is used to dim the rear headlight.
Using the value “0” for this CV results in a completely
dark rear headlight, when it is dimmed.
Using the value “255” keeps the rear headlight at its
maximum possible brightness, even when dimmed.
Speed Step Values for Customized Speed Curve
These CVs are used to specify the speed step
values for a customized speed curve. The factorydefault values for these CVs are specified in Table 2
in the section Creating a Customized Speed Curve.
0,1 0
0,1 0
0,1 0
0,1 0
0-255
1
(16)
(32)
(64)
(128)
Factory
Default
Speed
Step
Values
* The notation CVx.y = z means that bit y of CVx has the value ”z”. For
example, CV29.2 = 0 means that bit 2 of CV29 has the value ”0.”
** In the Default Value field, the numbers shown in parenthesis () are the
decimal values that must be written into a CV for the specified bit of that
CV to have the binary value “1”.
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives
13
Converting Binary Values of Individual Bits within
a Configuration Variable into the Equivalent
Decimal Value of the Entire CV
Reasons for Setting and Clearing the Individual Bits of a
Configuration Variable
To make a DCC decoder perform in the manner that you wish, you
sometimes need to set or clear individual bits of a CV. To program a
DCC decoder using a DCC system that allows only the writing of
decimal values into CVs (such as the Atlas Master Commander), it is
first necessary to convert the values of all the individual bits of that CV
that are to be set to the binary value 1 into their equivalent decimal
values. It is then necessary to add together all of these equivalent
decimal values.
Procedure for Converting Individual CV Bit Values into a
Decimal Equivalent Value for the CV
The following table illustrates how to calculate the decimal value that
must be written into a CV to set and/or clear a specified set of
individual bits within that CV.
Each bit of a CV that is to be set to the
binary value “1” can be represented by the
equivalent decimal number shown in the
second column of this table. To determine
the equivalent decimal value to be written
into the CV, first write in column 3 of this
table the decimal equivalent values of all
the bits of the CV that are to be set to a
binary 1. Write nothing in column 3 for
each bit of the CV that is to be cleared,
i.e., set to a binary 0. Then add up all the
numbers that you have written in column
3. The sum that you get is the equivalent
decimal value you need to write into the
CV.
Bit
Number
0 1
1 2
2 4
3 8
4 16
5 32
6 64
7 128
Decimal
Equivalent
SUM:
Decimal
Values for
CV
Calculation
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives 14
Example: Calculating the Default Value for CV29
From the definition of CV29 given in Table
1, we see that the default values of bits 1
and 2 are binary 1s; whereas, all other bits
in CV29 have a default value of binary 0.
To compute the decimal equivalent default
value of CV29, simply write in the
rightmost column of this table the number
"2" for bit 1 and the number "4" for bit 2.
Then add up all the non-zero numbers that
you have entered into this rightmost
column. Since the sum of these numbers
is 6, the decimal number to be
programmed into CV29 is 6.
Bit
Number
0 1
1 2
2 4
3 8
4 16
5 32
6 64
7 128
Decimal
Equivalent
Decimal
Values for
CV
Calculation
2
4
SUM: 6
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives
15
Creating a Customized Speed Curve
Common reasons for specifying a customized speed curve for a DCCequipped locomotive are to:
(1) Insure that dissimilar locomotives have the same performance
characteristics
(2) Have model locomotives perform more prototypically
In this example of creating a customized speed curve, we will assume
that the H15/16-44 decoder has been properly installed and tested. We
also assume that you are familiar with the general process of
programming CVs using your DCC system.
The first step in creating a customized (non-default) speed curve is to
assign a value to each internal speed step. This assignment is done by
specifying a value for each of the CVs from CV67 to CV94 using a table
such as that below, but substituting your desired speed step settings for
the default CV values given in the Internal Speed Step Value column of
this table.
The second step in creating a customized speed curve is to write the
value listed in the Internal Speed Step Value column into the CV
corresponding to that speed step.
The third and final step is to activate your customized speed curve by
writing the binary value “1” into bit 4 of CV29 (i.e., CV29.4 =1). Unless
this bit in CV29 has been set to a binary 1, the default speed curve that
was preset into the decoder at the factory will be used.
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives 16
Table 2: Default Speed Step Values for Decoder in
N Scale H15/16-44 Locomotives
Speed Step
in
14/27 Step Mode
1 1 4 67
2 8 68
2 3 12 69
4 16 70
3 5 20 71
6 26 72
4 7 32 73
8 38 74
5 9 44 75
10 50 76
6 11 58 77
12 66 78
7 13 74 79
14 82 80
8 15 90 81
16 100 82
9 17 110 83
18 120 84
10 19 130 85
20 140 86
11 21 152 87
22 164 88
12 23 174 89
24 186 90
13 25 200 91
26 216 92
14 27 234 93
- 28 254 94
To calculate the correct speed-step value for the 128 speed-step mode,
the H15/16-44 decoder will internally average the values for 28 speed
steps that were specified in (CVs 67 to 94).
Speed Step
in
28 Step Mode
Internal speed
step value
(defaults shown)
CV
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives
17
Troubleshooting Decoder Programming Problems
Fault Cause and Solution
Locomotive does not
move when you
address it on DCC
system.
Locomotive does not
move when DCC
system is set to the
address in CV1, even
though this address can
be read from CV1.
Locomotive does not
move when DCC
system is set to the
short address in CV1.
The short address can
be read from CV1, and
DCC functions can be
activated when the
DCC system is set to
the address in CV1.
DCC functions can be
activated when DCC
system is set to the
locomotive address, but
the locomotive does not
move.
The locomotive does
not appear to be using
the customized speed
curve values that you
have entered into CVs
67 to 94.
Function 0 (lighting)
cannot be switched on
and off.
Locomotive headlights
are only illuminated
when the locomotive
speed is increased or
decreased; the
locomotive headlights
go on and off as the
locomotive speed
changes.
Check to see if you have selected the correct address for that
locomotive.
You have entered the short address (CV1), but the decoder is set to
use the long address, i.e., bit 5 of CV29 has been set.
Use the long address or else clear bit 5 of CV 29.
Check to see if an advanced consist address has been
programmed into CV19, i.e., check to see if CV19 has a value
greater than 0. If CV19 has a non-zero value, you must either use
this advanced consist address to operate the locomotive or program
the value 0 into CV19.
Decoder is set to use a customized speed curve (CV29.4 = 1), but
you entered zero values into CVs 67 to 94. Either clear bit 4 of
CV29 or enter suitable non-zero speed step values into CVs 67 to
94.
Bit 4 is not set to “1” in CV29.
Matching of speed steps is incorrect: The decoder has been set to
28/128 speed steps, but the DCC system has been set to 14/27
speed steps.
Either set the DCC system to 28/128 speed steps or change the
decoder speed step setting to 14/27 speed steps. (CV29.1 = 0).
Matching of speed steps is incorrect: The decoder has been set to
14/27 speed steps, but the DCC system has been set to 28/128
speed steps. Either set the DCC system to 14/27 speed steps or
change the decoder speed step setting to 28/128 speed steps.
(CV29.1 = 1).
Atlas Model Railroad Co., Inc.
Decoder for Atlas N Scale H15/16-44 Locomotives 18
Atlas Limited One-Year DCC Decoder Warranty
Please fill out and mail the warranty card, within 30 days of
purchase. Atlas Model Railroad Company, Inc. warrants that this
decoder will be free from defects in material and workmanship
for a period of one year from the date of purchase. If this
decoder fails during the warranty period, uninstall and carefully
pack the item in the original carton, together with the dated sales
receipt, and return to:
Atlas Model Railroad Company, Attention HO/N Repair, 378
Florence Avenue, Hillside, NJ 07205. Defects due to misuse,
improper maintenance and/or abuse are not covered by the
warranty. This warranty gives you specific legal rights and you
may also have other rights, which vary from state to state.
For Technical Assistance
www.atlasrr.com
dcc@atlasrr.com
This equipment complies with Part 15 of FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
Please save this manual for future reference.
Lenz GmbH manufactures the H15/16-44 decoder for Atlas Model Railroad Co., Inc.
© 2004 Atlas Model Railroad Co, Inc; All Rights Reserved.
Atlas Model Railroad Co., Inc.
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