Atlas Model Vehicle 520099 User Manual

Decoder for Atlas N Scale H15/16-44 Locomotives  
1
The #520099 DCC decoder is designed for Atlas N scale H15/16-  
44 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.  
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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.  
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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).  
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Decoder for Atlas N Scale H15/16-44 Locomotives  
5
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  
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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.  
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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 H15/16-  
44 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  
Value**  
1-99  
3
1
2
3
4
1
2
3
4
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.  
0-31  
8
1
1
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.  
1-255  
1-255  
Acceleration Momentum:  
Determines the rate of change of speed upon  
acceleration. A higher value leads to a slower  
acceleration.  
Brake Momentum:  
Determines the rate of change of speed upon  
braking. A higher value leads to longer braking  
distances.  
0-55  
0-127  
6
1
-
-
5
6
Contains CV29 (see definition of CV29 below)  
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.  
-
46  
7
7
Version Number:  
This location stores the version number of the  
decoder. This CV is read-only.  
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Decoder for Atlas N Scale H15/16-44 Locomotives  
8
CV Reg. Description  
Range Default  
Value**  
-
127  
8
8
Manufacturers Identification:  
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.  
-
192-  
231  
0
17  
Long Address, High Byte  
The long (also called extended) address, if used,  
is contained in CV17 and CV18.  
-
-
0-255  
1-99  
0
0
18  
19  
Long Address, Low Byte  
Advanced Consist Address  
The Advanced Consist address, if used, is  
stored in CV19.  
0-55  
6
29  
Decoder Configuration, Byte 1:  
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  
0,1  
0
Locomotive direction:  
This bit sets the direction that the locomotive will  
move when told to move forward in digital (DCC)  
mode.  
(1)  
0 = locomotive’s direction is normal  
1 = locomotive’s direction is reversed  
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Decoder for Atlas N Scale H15/16-44 Locomotives  
9
CV  
29  
Description  
Range Default  
Value**  
Bit 1  
0,1  
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 speed-  
steps, and the decoder is set for 14 speed-  
steps.  
(2)  
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 speed-  
step mode; otherwise, the headlights cannot  
be controlled.  
Bit 2  
0,1  
1
Usage on conventional DC layouts:  
0 = locomotive operates only in digital (DCC)  
mode  
(4)  
1 = locomotive can operate in either analog  
(conventional DC) or digital (DCC) mode  
Bit 3 Always 0  
0
0,1  
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.  
2-digit or 4-digit Addressing:  
0= Short (2-digit) address used  
1= Long (4-digit) address used  
(16)  
0
Bit 5  
0,1  
(32)  
0
Bit 6 Not used  
Bit 7 Both bits always 0  
0 - 12  
1
50  
Decoder Configuration, Byte 2:  
CV50 is similar to CV29, but CV50 is used to set  
other properties. The definitions for the individual bits  
of CV50 are given below.  
Bit 0 Not used  
1
0
Not used.  
Bit 1  
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10  
CV  
50  
Description  
Range Default  
Value**  
Bit 2  
0,1  
0
Brake momentum on DC operation.  
Used to achieve prototypical braking at red  
signal indications if conventional DC control  
is disabled. (CV29.2 = 0*)  
(4)  
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  
0 = Precision Glide Control  
1 = Silent Drive  
0,1  
0
(8)  
0
Bits  
4-7  
Not used  
0-247  
0,1  
6
0
51  
Lighting Effects for Output A (front headlight)  
Bit 0  
Directional or Independent Headlights:  
0 = Headlights are directional.  
(1)  
1 = Headlights are independent per Rule  
17, with F0 controlling front headlight and F1  
controlling rear headlight.  
Bit 1  
0,1  
0,1  
1
(2)  
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.  
Bit 2  
1
Dimming of Front Headlight:  
(4)  
0 = Front headlight cannot be dimmed  
1 = Front headlight can be dimmed  
Bit 3 Not used  
0
Bit 4 0 = No effect  
0,1  
0,1  
0,1  
0
(16)  
0
(32)  
0
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  
(64)  
Bit 7 0 = No effect  
0,1  
0
1 = Front headlight functions as double pulse  
Strobe light  
(128)  
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11  
CV  
51  
Description  
Range Default  
Value**  
Notes for CV51:  
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  
54  
0-255  
64  
2
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.  
0-255  
0,1  
Function Mapping for Outputs C and D (front and  
rear marker lights)  
Bit 0  
Bit 1  
Bit 2  
Bit 3  
Bit 4  
Bit 5  
Bit 6  
Bit 7  
0
(1)  
0 = No effect  
1 = Marker lights controlled by F1  
0 = No effect  
1 = Marker lights controlled by F2  
0 = No effect  
1 = Marker lights controlled by F3  
0 = No effect  
1 = Marker lights controlled by F4  
0 = No effect  
1 = Marker lights controlled by F5  
0 = No effect  
1 = Marker lights controlled by F6  
0 = No effect  
1 = Marker lights controlled by F7  
0 = No effect  
0,1  
0,1  
0,1  
0,1  
0,1  
0,1  
0,1  
1
(2)  
0
(4)  
0
(8)  
0
(16)  
0
(32)  
0
(64)  
0
(128)  
1 = Marker lights controlled by F8  
0-246  
0,1  
6
0
1
(2)  
57  
Lighting Effects for Output B (rear headlight)  
Bit 0 Not used  
Bit 1  
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.  
Bit 2  
0,1  
1
(4)  
Dimming of Rear Headlight:  
0 = Rear headlight cannot be dimmed  
1 = Rear headlight can be dimmed  
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12  
CV  
57  
Description  
Range Default  
Value**  
Bit 3 Not used  
Bit 4 0 = No effect  
1 = Rear headlight functions as Gyro light  
Bit 5 0 = No effect  
1 = Rear headlight functions as Mars light  
Bit 6 0 = No effect  
0
0,1  
0,1  
0,1  
0
(16)  
0
(32)  
0
1 = Rear headlight functions as single pulse  
Strobe light  
(64)  
Bit 7 0 = No effect  
0,1  
0
1 = Rear headlight functions as double pulse  
Strobe light  
Notes for CV57:  
(128)  
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.  
58  
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.  
0-255  
67  
to  
94  
Speed Step Values for Customized Speed Curve  
These CVs are used to specify the speed step  
values for a customized speed curve. The factory-  
default values for these CVs are specified in Table 2  
in the section Creating a Customized Speed Curve.  
Factory  
Default  
Speed  
Step  
Values  
1
128  
Decoder Software Version – read only  
* 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”.  
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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.  
Bit  
Decimal  
Decimal  
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.  
Number  
Equivalent Values for  
CV  
Calculation  
0
1
2
3
4
5
6
7
1
2
4
8
16  
32  
64  
128  
SUM:  
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Decoder for Atlas N Scale H15/16-44 Locomotives  
14  
Example: Calculating the Default Value for CV29  
Bit  
Number  
Decimal  
Decimal  
Equivalent Values for  
From the definition of CV29 given in Table  
CV  
Calculation  
1, we see that the default values of bits 1  
and 2 are binary 1s; whereas, all other bits  
0
1
1
2
in CV29 have a default value of binary 0.  
2
4
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  
2
3
4
5
6
7
4
8
16  
32  
64  
128  
programmed into CV29 is 6.  
SUM:  
6
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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 DCC-  
equipped 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.  
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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  
Speed Step  
in  
Internal speed  
step value  
in  
CV  
14/27 Step Mode  
28 Step Mode (defaults shown)  
1
1
2
3
4
5
6
7
8
4
8
12  
16  
20  
26  
32  
38  
44  
50  
58  
66  
74  
82  
90  
100  
110  
120  
130  
140  
152  
164  
174  
186  
200  
216  
234  
254  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
91  
92  
93  
94  
2
3
4
5
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
6
7
8
9
10  
11  
12  
13  
14  
-
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).  
Atlas Model Railroad Co., Inc.  
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Decoder for Atlas N Scale H15/16-44 Locomotives  
17  
Troubleshooting Decoder Programming Problems  
Fault  
Cause and Solution  
Locomotive does not  
move when you  
Check to see if you have selected the correct address for that  
locomotive.  
address it on DCC  
system.  
Locomotive does not  
move when DCC  
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.  
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.  
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.  
DCC functions can be  
activated when DCC  
system is set to the  
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  
locomotive address, but 94.  
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.  
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).  
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.  
Atlas Model Railroad Co., Inc.  
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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  
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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