SoundTraxx Tsunami2 TSU-2200 User manual

Rev. A 06/27/16
Tsunami2™Digital Sound Decoder
Steam User’s Guide
Software Release 1.0

Notice
The information in this document is subject to change without notice.
SoundTraxx (Throttle Up! Corp.) shall not be liable for technical or editorial errors or omissions contained
herein, nor for incidental or consequential damage resulting from the furnishing, performance or use of
this material.
This document contains information protected by copyright. No part of this document may be photocopied
or reproduced in any form without the prior written consent of Throttle Up! Corp.
Product names mentioned herein may be trademarks and/or registered trademarks of their respective
companies.
SoundTraxx, Econami, Tsunami, Tsunami2, SoundTraxx DCC, Dynamic Digital Exhaust, Auto-Exhaust,
Hyperlight, Hyperdrive2, SoundCar, and Intelligent Consisting are trademarks of Throttle Up! Corp.

Contents
All Aboard! ......................................................................................4
Overview .............................................................................................................. 4
Using Tsunami2.................................................................................................... 5
CV Programming Tutorial ................................................................................... 11
Introduction to Programming .............................................................................. 13
Basic Programming.......................................................................18
Configuring the Address ..................................................................................... 18
Configuring the Decoder..................................................................................... 19
Configuring Throttle and Braking ........................................................................ 21
Configuring Lighting Outputs .............................................................................. 27
Configuring Sound Effects.................................................................................. 32
Configuring Automatic Sounds ........................................................................... 40
Advanced Programming................................................................46
Configuring Audio Control .................................................................................. 46
Configuring Dynamic Digital Exhaust ................................................................. 52
Configuring Function Mapping............................................................................ 55
Configuring Hyperdrive2..................................................................................... 61
Configuring Advanced Consist Operation........................................................... 65
Miscellaneous Features.................................................................69
Configuring Analog Mode Operation .................................................................. 69
Troubleshooting............................................................................73
Sorting Out Decoder Difficulties.......................................................................... 73
Appendix A: Decimal-Hex-Binary Conversions .............................76
Appendix B: Tsuami2 Steam CV Reference...................................77
Appendix C: License Agreement ...................................................78
Appendix D: Service and Warranty Policy ....................................79
Appendix E: Declaration of Conformity.........................................80

All Aboard!
Tsunami2 Steam User’s Guide 4
All Aboard!
Overview
Congratulations on purchasing your SoundTraxx Tsunami2 Digital Sound Decoder (DSD) for
steam locomotives! Tsunami2 is the newest wave of SoundTraxx innovation and builds upon
the previous generation of Tsunami to offer the highest quality sound for model railroading. This
user’s guide shows you how to operate Tsunami2 and customize each decoder setting to fit
your preferences, while providing some helpful troubleshooting tips along the way.
We suggest referring to the user documents listed below as you read this user’s guide.
Tsunami2 Installation Guide
Provides instructions and strategies for
successful sound installations.
Tsunami2 Steam Quick Start Guide
Gives an overview of the decoder’s default
settings and highlights some of the features.
Tsunami2 Steam Technical Reference
Offers a list of all included CVs and details
making adjustments to settings.
Tsunami2 Steam Sound Selection Reference
Lists each included sound effect for configuring
a prototypical operating experience.
These documents can be downloaded from our website at www.soundtraxx.com.

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Tsunami2 Steam User’s Guide 5
Using Tsunami2
The Tsunami2 Digital Sound Decoder is designed to enhance your model railroading
experience by giving you a wide variety of innovative features and incredibly realistic sound for
your models. Some of the features discussed in this user’s guide include Dynamic Digital
Exhaust, Hyperdrive2 advanced motor control, Flex-Map function mapping technology, two
volume mixers, exhaust cutoff control, independent and train brake functions, and Fireman Fred
sound effects. Tsunami2 also provides selectable whistles, bells, exhaust chuffs, airpumps, and
couplers to allow more versatility in creating your ideal model railroading experience.
You can start using Tsunami2 right out of the package without making any adjustments.
However, you may adjust settings at any time by making changes to Configuration Variables
(CVs). Most DCC decoder and command station manuals call this “programming”, though this is
misleading and sounds scarier than it is. At no point are you required to learn programming!
This user’s guide will walk you through operating and programming Tsunami2 to its full capacity.
Default Function Assignments
The first time you operate your Tsunami2 decoder,
you will be able to activate features and sound effects
by simply pressing the appropriate key on your cab or
command station console. These are “default”
function assignments. The effects listed in Table A
are assigned to function keys F0-F28 by default. This
section describes how to activate each effect with
function keys.
Note: You can assign any effect to function keys
labeled as “Not Assigned” in Table A with Flex-Map
function mapping CVs. Refer to “Configuring Function
Mapping” for more information about customizing
function assignments.
Note: Pressing function keys F0-F28 will toggle
functions “on” and “off” and activate effects.
Turn On the Lights
Ensure your locomotive is in the forward direction,
then turn on F0 to illuminate the headlight and spool
up the dynamo. Reverse the locomotive direction to
turn off the headlight and turn on the backup light.
Pressing F0 a second time will turn off the dynamo,
headlight, and backup light.
Turn on F7 to dim the headlight or backup light before
passing oncoming trains, or while waiting on a siding.
Press F7 again to return the headlight and backup
light outputs to full brightness.
Table A. Default Functions
Function Key Effect
F0(f) Headlight, Dynamo
F0(r) Backup Light, Dynamo
F1 Bell
F2 Whistle
F3 Short Whistle
F4 Cylinder Cocks
F5 Cutoff+
F6 Cutoff-
F7 Dimmer
F8 Mute
F9 Grade-Crossing Signal
F10 Blowdown
F11 Independent/Train Brake
F12 Brake Select
F13 Couple/Uncouple
F14 Switching Mode
F15 Wheel Chains
F16 Water Stop
F17 Fuel Loading
F18 Ash Dump
F19 Wheel Slip
F20 Injector
F21 Sander Valve
F22 Cab Chatter
F23 All Aboard/Coach Doors
F24 FX3 Function Output
F25 FX4 Function Output
F26 FX5 Function Output
F27 FX6 Function Output
F28 Not Assigned

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Tsunami2 Steam User’s Guide 6
Ring the Bell
Turn on F1 to ring the bell. Press F1 again to stop ringing the bell. The bell is generally rung
before moving the locomotive, when approaching crossings, to alert people or equipment near
the track, and as a warning signal when necessary.
Blow the Whistle
Signaling can make your operating sessions more fun! Engineers signal to notify passengers,
crew, and other trains of common locomotive movements, such as stopping, moving forward,
backing up, and approaching grade crossings. Tsunami2 provides three functions for signaling.
Use F2, F3, and F9 to signal prototypically while you operate, as described below.
Press and release F2 to blow the “long” whistle. Contrary to most function keys, the duration of
the whistle blast is determined by how long you press F2. In other words, the whistle blast will
start when you press F2, and stop when you release F2. Press F3 to issue the single “toot” of
the “short” whistle. The short whistle will be the same length every time you press F3, unlike the
long whistle.
Note: Function key F2 on the NCE Power Cab command station is on/off or “latching”, i.e.,
pressing F2 to turn on the function will start the whistle blast, and pressing F2 again to turn off
the function will stop the whistle blast. To issue momentary whistle blasts with the NCE Power
Cab, press and release the “Horn/Whistle” button instead of using F2.
To issue the long-long-short-long grade-crossing signal automatically, turn on F9 as your
locomotive approaches a grade crossing. Refer to Table B to view some more common signals.
Table B. Whistle Signals Long = –
Short = ●
Signal Description
– – ●– Approaching a grade crossing: hold final blast until crossing is occupied
●Applying brakes
– – Releasing brakes, proceeding forward
●●●When moving, stop; when stopped, back up
●●●●Request signal from trainman
– ●●●Signal flagman to protect rear
– ●Warning signal: use when approaching areas with obstructed views and when
approaching/passing passenger/freight trains
– Approaching stations, junctions, and railroad crossings at grades
Activate Cylinder Cocks
As you begin to accelerate from a stop, turn on F4 to purge the condensed water from the
cylinder. The sound of the condensed water in the cylinder being expelled outwards with the
steam, can be heard (“swish-swoosh”) as the engine moves.
Adjust the Exhaust Cutoff
As the locomotive continues to accelerate, less steam is needed in the cylinders to keep the
train moving. The engineer moves the power reverse lever or Johnson bar closer to the center
of the quadrant to shorten the amount of time steam is emitted into the cylinders.

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Tsunami2 Steam User’s Guide 7
You can shorten the exhaust cutoff of the locomotive by turning on F5. The cutoff can be
shortened three times to replicate various operating conditions. Each time it is shortened the
exhaust chuff will change in both pitch and length to replicate a lighter load on the locomotive.
As the engine crests a grade, shorten the cutoff a fourth time to simulate drifting. The
locomotive will begin to drift and the exhaust chuff will fade as the engineer closes the throttle.
The snifter valve will drop and the sound of air being sucked through leaky valve packings will
start.
As the engine approaches the bottom of the hill, more steam is needed to keep the train
moving. Turn on F6 to decrease the cutoff and exit drifting. The snifter valve will lift and the
exhaust chuff will return as the engineer slowly opens the throttle. As more steam is needed,
decrease the cutoff even further by turning on F6 again. The cutoff can be lengthened three
times. Each time the cutoff is decreased, the chuff will change in both pitch and length to
replicate a harder working locomotive.
Apply the Independent Brake
The engineer generally applies the brakes on the locomotive during switching operations and to
control slack between units. You can use the independent brake function to simulate applying
the locomotive brake independently from the rest of the train.
Turn on F11 to apply the independent brake before bringing your locomotive to a stop. The
locomotive brakes typically squeal just before the wheels stop turning. You can simulate
applying the independent brake prototypically by turning on F11 as your locomotive decelerates
to a stop. Press F11 again to release the independent brake before departing. Refer to
“Configuring Throttle and Braking” to set the independent brake rate and allow the independent
brake function to reduce speed when activated.
Apply the Train Brake
You can apply the brakes on all locomotives and cars at the same time to control the speed of
the entire train at a consistent rate. On the prototype, air hoses are fastened to each piece of
equipment to form a single braking system, referred to as the “train brake” or “automatic brake.”
The train brake function allows you to simulate applying each unit’s brake at once to reduce
train speed.
First turn on F12 to select the train brake in place of the independent brake. The air compressor
will cycle on to simulate charging the train line, and indicate that the train brake is selected.
Next, turn on F11 to simulate applying the train brake. While the train brake function is turned
on, pressing F11 again will release the train brakes and turn the air compressor back on to
recharge the train line.
You can use F11 to activate the train brake only when the F12 brake select function is turned
on. Turn off F12 to reselect the independent brake for F11 and disable the train brake. Refer to
“Configuring Throttle and Braking” to set the train brake rate and allow the train brake function to
reduce speed when activated.
Mute Sound Effects
Turn on F8 to mute all sound effects when you need to silence your train. The mute function
allows a quick way to turn off sound effects for a phone call, for instance. Press F8 again to
return all sound effect volume levels to their prior settings.

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Tsunami2 Steam User’s Guide 8
Blow Down the Boiler
There’s sure to be particle buildup in the boiler of your engine. To clean the boiler’s mud ring,
turn on F10 to open the blowdown valve and blow out the sediment. Turn off F10 to close the
valve.
Couple and Uncouple
Turn on F13 to engage the sound of the coupler as you add cars to your train. When you
uncouple, press F13 a second time to open the knuckle and separate the glad hands.
Use Switching Mode
To improve throttle control for switching operations, turn on F14 to override all momentum CVs
and reduce the current throttle setting by 50%. Press F14 again to reset locomotive speed to the
prior speed step and reactivate all momentum CV settings. For more information about
momentum CVs, refer to “Configuring Throttle and Braking.”
Apply Wheel Chains
Turn on F15 to place chains around the locomotive wheels. Press F15 again to remove the
chains from the wheels.
Activate Water Stop
When your locomotive is stopped, turn on F16 to open the water hatch and fill the tender. Turn
off F16 to stop filling the tender and close the hatch before departure.
Refuel the Locomotive
While your locomotive is stopped, turn on F17 to open the coal chute doors and begin loading
coal into the tender. Press F17 again before departing to stop loading coal into the tender and
close the coal chute doors. These sounds can also be configured for oil fired, wood fired and
coal stoker fired locomotives. For more information about selecting the fuel type, refer to
“Configuring Sound Effects.”
Ash Dump
Turn on F18 to clean out the firebox and ash pan after running your locomotive for a while.
Press F18 again to stop the cleaning sequence.
Activate Wheel Slip
While the locomotive is moving, turn on F19 to play the wheel slip effect. The sound of the
wheel slip can be heard as short staccato bursts of exhaust chuffs, followed by the sound of the
engineer backing off the throttle to regain traction. Press F19 again to stop the wheels from
slipping.
Operate the Injector
Turn on F20 to turn on the injector and fill the boiler with water. Press F20 again to stop the
injector fill sequence.
Open the Sander Valve
In the real world, wet rails can cause wheels to slip. When extra traction is needed, turn on F21
to open the sander valve. You will hear the quiet sound of sound being deposited onto the rails.
Press F21 again to close the sander valve.
Listen to Cab Chatter
Turn on F22 to hear railroad radio transmissions being exchanged from inside the cab. The
radio will continue to play messages at random while F22 is turned on. Press F22 again to turn

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Tsunami2 Steam User’s Guide 9
off the function. The current message will finish and radio will be silent. To manually issue a new
radio message, toggle the cab chatter function from off to on by pressing F22 twice.
Announce “All Aboard!”
Turn on F23 before leaving the station to issue the conductor’s “all aboard!” announcement.
After the coach doors slam shut, increase the throttle and depart the station.
Turn On FX3-FX6 Lighting
If you have additional lights wired to the FX3-FX6 function outputs, use function keys F24-F27
to activate them. Depending on board format, Tsunami2 offers up to six lighting outputs to
support Hyperlight effects. To select Hyperlight effects for lighting outputs, refer to “Configuring
Lighting Outputs.”
Make an Emergency Stop
Press the emergency stop button to issue the emergency brake application and bring your train
to an immediate stop.
Automatic Sound Effects
Tsunami2 plays a variety sound effects automatically. Automatic sound effects respond
prototypically to aspects of operation, such as certain functions, speed settings, and motor load
changes.
Power Reverser or Johnson Bar
Changing the direction of the locomotive will automatically play the sound of the power reverser
being moved forward or backward. Each time you increase or decrease the exhaust cutoff with
F5 and F6, the power reverser can be heard adjusting the position of the valves.
The locomotive can also be configured with a manual reverse lever, also known as a Johnson
bar. Refer to the “Configuring Sound Effects” section for more information.
Auto-Exhaust
2-cylinder exhaust for a light steam locomotive is the decoder’s default setting, and the chuff
rate is automatically regulated by the back-EMF sensor in response to the demand on the
motor. For example, the chuff volume and timbre will respond to changes in grade; the chuff
becomes more rapid when the motor is spinning faster, and less rapid when the motor is
impeded. To adjust the Auto-Exhaust chuff rate which synchronizes the chuff with the motion of
the wheels, refer to “Configuring Sound Effects.”
The Dynamic Digital Exhaust (DDE) processor will automatically adjust the exhaust volume and
timbre to simulate the engine working under varying load conditions. You can also use F5 and
F6 to manually adjust the exhaust cutoff if desired, as mentioned on page 6. Refer to
“Configuring Throttle and Braking” to set acceleration and deceleration rates, and refer to
“Configuring Dynamic Digital Exhaust” to adjust a given parameter of the DDE processor.
Furthermore, you can select 3-cylinder or articulated type exhaust in place of 2-cylinder exhaust
for a range of exhaust chuff sound effects. Refer to “Configuring Sound Effects” for details
regarding exhaust selections.
Snifter Valve
Just as you start to move the locomotive, you’ll hear the Pffffffft! of the snifter valve opening. As
you come to a stop, you’ll hear the clink! of the snifter valve dropping.

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Tsunami2 Steam User’s Guide 10
Side Rod Clank
The “clanks” and “clunks” of the side rod occur with the exhaust chuff. You can use exhaust
cutoff control to mute the exhaust chuff and elevate the volume of the side rod clank if desired.
Airpumps
The airpump maintains air pressure during operation. To simulate charging the train line, the
pump cadence will revert to its most rapid setting when the coupler function is turned on, when
the train brake function is turned off, and every third time the independent brake function is
turned on.
Blower
The blower simulates draft being maintained near the exhaust nozzle in the smokebox during
operation.
Clickety-Clack
The “clickety-clack” of the locomotive running across rail joints is synchronized in proportion to
locomotive speed. To adjust the clickety-clack sound effect, refer to “Configuring Sound
Effects.”
Fireman Fred
Each time the engine is brought to a stop, Fireman Fred may attend to a randomly selected task
(or tasks), including shoveling coal, oiling the side rods, checking the frame and more.

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Tsunami2 Steam User’s Guide 11
CV Programming Tutorial
Configuration Variable (CV) is the industry-adopted and NMRA Standard term for a decoder’s
user-adjustable parameters of the decoder. CVs allow you to adjust various decoder properties
and customize your operating experience. The address, audio settings, motor control, lighting
effects, and function assignments are just some of the properties you can adjust with CVs. You
can modify CVs at any time and the decoder will save your settings even when the power is
turned off. If reading about CV programming already has your head spinning, this tutorial will
help you understand how CVs work.
At first glance, you may feel overwhelmed by the large number of CVs offered by Tsunami2.
Don’t worry! You don’t need an engineering degree to customize your decoder’s settings.
Making adjustments is easy, and you can customize settings one CV at a time by referring to
this user’s guide and the Tsunami2 Steam Technical Reference. When in doubt, you can always
reset the decoder to factory defaults. Refer to “Resetting CVs” for more information.
Bits and Bytes
All the bits, bytes, and other symbols used in decoder manuals, and differences between
command stations can make CV programming difficult to understand. Put simply, each CV
contains a value that can be changed, and changing the value of a CV will modify a specific
decoder setting. However, knowing a little more about how CV values are represented will help
you make the right adjustments. CV values can be represented in the three numeric formats
listed below:
Decimal
Decimal representation is the format you will probably use most often. Decimal values are
represented using numerals 0-9. Each CV contains a decimal value from 0 to 255.
Binary
Like computers, binary is the numbering system used in Digital Sound Decoders. Binary values
are called “bits” and can be represented as either 0 or 1. Each CV contains eight bits, or one
“byte.” Each CV contains a binary value from 00000000 to 11111111, which easily converts to
decimal form.
Hexadecimal
Referred to as “hex,” hexadecimal values are represented using characters A-F and numerals
0-9. Each CV contains a hex value from 00 to FF. Hex allows you to represent decimal numbers
using fewer digits if your command station has a limiting interface.
Programming by the Bits
Each CV is made up of eight bits and can be set to decimal values from 0 to 255 or binary
values from 00000000 to 11111111. Most CVs contain a single piece of data easily represented
in decimal, binary, or hex.
Some CVs use individual bits to control specific features, allowing up to eight features to be
controlled using a single CV. You can set each bit to a binary input of 0 or 1 to modify a specific
setting. For this reason, “programming by the bits” allows you to make basic adjustments that
are on/off, disabled/enabled, etc. Because most DCC systems don’t use binary representation,
programming by the bits requires you to convert binary values into decimal (or hex) values.

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Tsunami2 Steam User’s Guide 12
This user’s guide represents CV values in decimal form to expedite programming. However,
binary is occasionally used to represent CV values in the Tsunami2 Steam Technical Reference
for CVs that are programmed by the bits. For instance, CV 29 (Configuration Data 1) is
programmed by the bits and controls important decoder settings, such as the locomotive
direction, the decoder’s speed step mode, alternate power source, and speed table setting.
A CV is illustrated below and shows a binary value for each bit. Bits 1 and 4 are set to 1, and
bits 0, 2, 3, 5, and 6 are set to 0, which is a binary value of 00010010.
Refer to Appendix A to locate the binary value 00010010 and convert it to a decimal value of 18
(0x12 in hex). Entering a value of 18 into the CV would then adjust the settings contained by
each bit according to the binary input 00010010.
Binary-Decimal Conversions
You can convert binary values into decimal form without the conversion chart as well. It helps to
know the decimal value contained in each bit set to 1. The decimal value of each bit doubles
sequentially (1, 2, 4, 8, 16, etc.) from bit 0 to bit 7. Add the decimal values together for each bit
set to 1. The sum is the total decimal value of the CV.

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Tsunami2 Steam User’s Guide 13
Introduction to Programming
This section details CV programming modes, reading CVs,
accessing indexed CVs, resetting CVs to factory defaults,
and locking and unlocking CVs. Due to the varying CV
programming methods used by DCC systems, we cannot
provide comprehensive instructions that address every
command station and must assume you understand the
capabilities of your system on some level. Consult your
DCC system manual or contact the manufacturer if you
need more detailed programming instructions.
The sections of this user’s guide are categorized according to each part of decoder operation,
from basic to advanced programming, and allows you to configure one group of CVs at a time.
When you’re comfortable programming one set of CVs, move on to the next category and
explore each setting Tsunami2 has to offer. Refer to the Tsunami2 Steam Technical Reference
for a list of CVs detailing each adjustable setting.
Programming Modes
Tsunami2 supports Operations Mode and Service Mode programming.
Operations Mode
Referred to as “Ops Mode” or “programming on the main,” Operations Mode allows you to
program CVs during operation even when other locomotives and rolling stock are present.
Being able to program during operation is especially helpful when making adjustments to sound
effects since you can hear the results of the changes you’ve made. However, because data
cannot be read back from the decoder, programming on the main will not allow you to verify CV
values.
Service Mode
Service Mode programming usually requires connecting the model to a dedicated programmer
or placing it on a separate programming track. Tsunami2 supports four types of Service Mode
instructions:
Address Mode: CV 1 may be modified
Register Mode: CVs 1, 2, 3, 4, 7, 8, and 29 may be modified
Paged Mode: A page register is used to modify any CV indirectly
Direct Mode: All CVs may be directly modified
Reading CVs
Some command stations permit you to read the value of a CV and verify its setting during
Service Mode programming. If you have trouble reading or verifying CVs, there may be a
problem within the command station’s design rather than with the decoder.
Try another programming mode if you experience difficulties programming or reading CVs.
Many of the newer DCC systems automatically select the appropriate programming mode and
only require you to enter the CV number and desired value. However, some DCC systems may
restrict the number of available CVs. If you’re having difficulty determining the programming
modes supported by your DCC system, refer to the manual or contact the manufacturer.
Note: Tsunami2 does not require a programming track booster, such as the PTB-100.
Configuration Variable Control CVs
CV 8: Manufacturer ID
CV 15: CV Unlock Code
CV 16: CV Lock ID
CV 30: Error Information
CV 31: CV Index 1
CV 32: CV Index 2
CVs 1.257-1.512: Indexed CV Page 1
CVs 2.257-2.512: Indexed CV Page 2

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Tsunami2 Steam User’s Guide 14
Indexed CVs
The term “indexed CVs” tends to cause confusion and consternation. Simply put, indexed CVs
are located on ‘pages’ to help manage the total number of CVs. This is required by the NMRA
DCC Standard and works like this:
The standard (S-9.2.2) requires that CVs exceeding CV 256 be contained within “indexed CV
pages”. An individual set of CVs from 257-512 is contained within each indexed CV page.
Pages are indicated in user documentation by a preceding number. For example, CV 257 on
indexed page 1, would be represented as 1.257. CV 257 on indexed page 2 would be
represented as 2.257 and so on. This preceding number is also the value to enter into CV 32 to
select that page.
Indexed CVs are accessed with the use of two CVs: CV 31 enables indexing when set to a
value of 16 (the default value) and CV 32 selects the desired indexed page.
Because of the number of features and options contained within Tsunami2 decoders, three
pages of indexed CVs are provided:
To access CVs 1.257-1.512:
1. Ensure CV 31 is set to a value of 16.
2. Enter a value of 1 into CV 32 to select Indexed CV Page 1.
3. Access CVs 257-512 from your command station.
To access CVs 2.257-2.512:
1. Ensure CV 31 is set to a value of 16.
2. Enter a value of 2 into CV 32 to select Indexed CV Page 2.
3. Access CVs 257-512 from your command station.
To access CVs 3.257-3.512:
1. Ensure CV 31 is set to a value of 16.
2. Enter a value of 3 into CV 32 to select Indexed CV Page 3.
3. Access CVs 257-512 from your command station.
To make things easier, Tsunami2 CVs are grouped by like function as follows:
CVs 1.257-1.512 are used for configuring Flex-Map function mapping CVs. Access CVs 1.257-
1.384 for function mapping CVs and CVs 1.385-1.512 for automatic effect configuration. Refer
to “Configuring Function Mapping” for more information.
CVs 2.257-2.512 are used for adjusting alternate mixer channel volume levels and configuring
Dynamic Digital Exhaust CVs. Access CVs 2.289-2.320 for alternate mixer CVs and CVs 2.503-
2.512 for DDE control CVs. Refer to “Configuring Throttle and Braking,” “Configuring Sound
Effects” and “Configuring Dynamic Digital Exhaust” for more information.
CVs 3.257-3.512 are used for adjusting the clickety-clack rate of the clickety-clack and rail joints
sound effects. Refer to “Configuring Sound Effects” for more information.

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Tsunami2 Steam User’s Guide 15
Resetting CVs (Starting Over)
Occasionally, something goes wrong and Tsunami2 will not respond as expected. Usually, this
is caused by one or more CVs inadvertently being programmed to the wrong value. The CVs
can be quickly reset to their factory default values. Follow the steps below to perform either a
full or partial CV reset:
1. Turn on track power to the decoder. If you have a SoundTraxx CurrentKeeper™or
another device that maintains power, allow at least one minute before turning the power
back on.
2. Enter one of the following values into CV 8 (Manufacturer ID) to perform a full or partial
CV reset:
CV 8: Manufacturer ID
8 = Reset All CVs
9 = Reset CVs 1-128
10 = Reset CVs 129-256
11 = Reset CVs 1.257-1.512
12 = Reset CVs 2.257-2.512
13 = Reset CVs 3.257-3.512
3. Wait about 10 seconds after returning power to the decoder. The headlight and/or
backup light will flash 16 times to indicate CVs have been successfully reset. Tsunami2
will respond to primary address 3 after all CVs, or CVs 1-128 have been reset.
Note: Continue cycling power to the decoder if the CV reset is unsuccessful. If you are unable
to reset CV values, continue to “Locking and Unlocking CVs” to verify the decoder is not locked.
Locking and Unlocking CVs
The CV Lock/Unlock feature allows you to program a decoder without the danger of overwriting
the programming in another. This is especially useful in installations where multiple decoders
are used. For example, if you have installed a function decoder in addition to the sound
decoder, you may wish to lock the CVs after programming to prevent accidentally programming
one decoder or the other.
CV 15, CV Unlock Code
CV 16, CV Lock Code
CV 30, Error Information
To use the CV Lock feature implemented in CVs 15 and 16, bit 0 of CV 30 must first be set to 1
(the default value is 0). This is to avoid inadvertently locking the decoder when the CV Lock
feature is not needed.
CVs 15 and 16 are used for locking and unlocking the decoder. CV 15 is the Unlock Code and
may be programmed to any value from 0 to 255 regardless of whether the decoder is locked or
unlocked. CV 16 is the Lock Code and may be set to any value from 0 to 7, but only when the
decoder is unlocked. Attempts to program CV 16 with a value greater than 7 will be ignored.
The decoder is unlocked when the value in CV 15 matches the value in CV 16. Otherwise the
decoder is locked and cannot be programmed in either Operations Mode or Service Mode.
Further, a locked decoder cannot be reset to its factory defaults until it is unlocked. Tsunami2
decoders are shipped from the factory with all CVs unlocked, that is, CV 15 and 16 are both set
to 0.

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Tsunami2 Steam User’s Guide 16
Note that if the decoder is unlocked, changing the value in CV 16 will instantly lock the decoder.
You must then set CV 15 to the same value as was just programmed into CV 16 to unlock the
decoder again. If you use the CV Locking feature for a multi-decoder installation in one model,
each decoder must first have its Lock Code set in CV 16 prior to the installation of any other
decoders. Otherwise, all the decoders will have the same Lock Code and the feature will not
work. First install one decoder and program its Lock Code. Then install the next decoder and
program its Lock Code. Since the first decoder is now locked, it will be unaffected by the
programming of the second decoder (unless you accidentally set the Lock Code of the two
decoders to the same value. If this happens you will need to disconnect one decoder and start
over). Continue in this manner until all decoders have been installed and their Lock Codes have
been set.
Follow the steps below to lock and unlock CVs:
1. Enter a value of 1 into CV 30 (Error Information) to enable the CV lock/unlock feature.
2. Enter a value from 0 to 7 into CV 16 to set the lock code.
3. To unlock CVs, set CV 15 to the same value as CV 16.
4. To lock CVs, set CV 15 to a different value than CV 16 to unlock CVs.
Note: CV 8 (Manufacturer ID) cannot be used to reset CVs to factory defaults when CVs are
locked, i.e., when CV 30 is set to 1 and CVs 15 and 16 are not set to the same value.
It is a good idea to set up a standardized system so you don’t forget the Lock Code settings.
You might, for example, set all motor decoders to a CV Lock Value of 1, sound decoders to a
value of 2, and function decoders to a value of 3. Keeping CV 15 set to 0 will guarantee the
decoder stays locked until you are ready to begin programming.
Example: Using CV Lock/Unlock
Let’s say you will be installing motor decoder, a sound decoder, and a function decoder in one
locomotive. Using the previously described system, you would first install the motor decoder and
set its Lock Code by programming CV 16 to 1. Since CV 15 (CV Unlock Code) is currently set to
0 (the default value), the decoder is immediately locked. Now install the sound decoder and set
its Lock Code by programming CV 16 to 2. Since CV 15 is still set to 0, this decoder is also
immediately locked. Now install the function decoder and set its Lock Code by programming CV
16 to 3. At this point, all three decoders are installed and locked. Starting with the motor
decoder, set CV 15 to 1 to unlock and program the motor decoder. When you are finished, set
CV 15 to 2 and program the sound decoder. Finally, set CV 15 to 3 and program the function
decoder. When you are done, set CV 15 back to 0 to lock all the decoders.
If You Forget the Lock Code
As there are only eight possible combinations, you can easily determine a forgotten Lock Code
using trial and error with the following procedure:
Place the locomotive on the Programming Track and set CV 15 to 0. Then try to read the value
in CV 16. If CV 16 does not read back, the decoder is locked. Set CV 15 to 1 and try reading CV
16 once more. Again, if CV 16 does not read back, the decoder is still locked. Program CV 15 to
2 and try reading CV 16 again. Continuing in the manner, you should eventually find the value
stored in CV 16 as it can only be programmed from 0 to 7. If you have tried setting CV 15 to all
eight values from 0 to 7 and the decoder still does not respond, there may be a problem with the
installation, the program track, or the decoder itself and further investigation will be required.
To reiterate, follow the steps below to unlock CVs and determine the lock code:

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Tsunami2 Steam User’s Guide 17
1. Place the model on the programming track and enter a value of 0 into CV 15.
2. Try reading the value of CV 16. If the value is not read back, CVs are locked.
3. Enter a value of 1 into CV 15 and try reading the value of CV 16 again.
4. If the value is not read back, enter a value of 2 into CV 15 and try again.
5. Enter values 3-7 into CV 15 until the value of CV 16 is read back and CVs are unlocked.
If you still can’t identify the lock code, there may be a problem with the installation, programming
track, or decoder. Contact SoundTraxx customer support if this occurs.
If you do not have access to a programming track with read-back capabilities (or are uncertain
as to whether it is working properly), you can also use Operations Mode to discover the Lock
Code by alternately programming CV 15 and setting another CV to a value where there is a
known response. For example, changing CV 128 (Master Volume Control) will provide auditory
feedback as to whether the decoder is unlocked by virtue of a change in sound level. Thus, you
would begin by setting CV 15 to 0 and then setting CV 128 to 0. If the volume does not fall to 0,
the decoder is locked. Then set CV 15 to 1 and try programming CV 128 again. Repeat this
process until you find a value for CV 15 that results in a change in sound volume as you change
CV 128.
Troubleshooting Tip: Even if you are not planning to use the CV Lock feature, it can still be
accidentally activated by inadvertently programming CV 15 or 16 with a non-default value. If you
have a decoder that is otherwise working properly (i.e., making sound and responding to throttle
commands) but has suddenly stopped accepting CV changes, then first run through the
procedure under “If you Forget the Lock Code” to determine if the decoder has been locked.

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Tsunami2 Steam User’s Guide 18
Basic Programming
Configuring the Address
Like all DCC decoders, Tsunami2 responds to primary address 3
right out of the package. Address control CVs allow you to set
primary and extended addresses or your choice, which can be
useful when matching the decoder’s address with the number on
the locomotive, for instance.
Setting Addresses
Tsunami2 recognizes either the primary address (also known as the short address) in CV 1 or
the extended (long) address in CVs 17-18 (Extended Address). Whether you use the primary or
extended address will first depend on whether or not your DCC system uses extended
addressing (not all of them do, so if in doubt, see your command station owner’s manual.)
Second, it will depend on your preferences and the numbering scheme you use for setting your
decoder addresses. The extended address has the advantage that you can use all four digits of
a locomotive’s road number for the decoder address making it easy to remember. Be aware that
some DCC systems do not support the full range of available addresses.
Programming Notes: You can set the primary and extended addresses in Service Mode at any
time. Some DCC systems also allow you to set the address in Operations Mode according to
the following restrictions:
If the decoder’s primary address is enabled (bit 5 of CV 29 set to 0), only the extended
address can be changed in Operations Mode.
If the decoder’s extended address is enabled (bit 5 of CV 29 set to 1), only the primary
address can be changed in Operations Mode.
Primary Address
Enter a value from 1 to 127 into CV 1 to set the primary address. All SoundTraxx decoders are
set to primary address 3 by default.
Extended Address
The extended address is actually made up of two CVs, 17 and 18. Unless you are an
experienced user, you should not try to program these CVs individually as a specific protocol is
required in order for the decoder to accept the new data (see the Tsunami2 Steam Technical
Reference for details). Since most command stations that support extended addressing will
automatically generate the correct protocol, simply follow their instructions for setting the
extended address.
After setting the extended address, set bit 5 of CV 29 (Configuration Data 1) to 1 to enable its
usage. If bit 5 of CV 29 is set to 0, the decoder will continue to respond to the primary address.
Continue to “Configuring the Decoder” for more information about CV 29.
Address Control CVs
CV 1: Primary Address
CVs 17-18: Extended Address

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Tsunami2 Steam User’s Guide 19
Configuring the Decoder
After setting the address, we recommend you adjust the settings of
CV 29 (Configuration Data 1). CV 29 controls a variety of important
settings. It determines locomotive direction, speed-step mode,
alternate power source, speed tables, and the decoder address.
Configuring CV 29
Add the values of all bits set to 1 in CV 29 and enter the sum into the CV to adjust settings. For
information about CVs and entering CV values, refer to “CV Programming Tutorial.”
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 EAM STE 0 APS F0 DIR
DIR: Locomotive Direction
Bit 0 (DIR) is used to determine locomotive direction. Setting bit 0 to 1 will invert direction
commands, and the decoder will interpret forward as reverse, and reverse as forward. This
operating mode is most useful for setting up diesel engines that ran with the long hood section
forward. However, it is also useful for electronically correcting installations where the motor
wires were accidentally reversed and avoids dismantling the locomotive a second time.
F0: F0 Location (Speed-Step Mode Select)
Bit 1 (F0) is used to determine the number of speed steps within the throttle range. 14, 28, and
128 speed-step modes are available, and 28/128 speed-step mode has been enabled by
default. Select the highest number of speed steps supported by your command station for the
most refined throttle operation.
APS: Alternate Power Source (Analog Mode)
Setting bit 2 (APS) to 1 will allow the decoder to use an analog power source when a DCC
signal is not present. Entering a value of 1 into CV 12 (Alternate Power Source) will enable
analog mode (disabled by default). Refer to “Configuring for Analog Mode Operation” for more
information.
STE: Speed Table Enable
Setting bit 4 (STE) to 1 will select a linear or 28-point custom speed table in place of the 3-point
speed table. Refer to “Configuring Throttle and Braking” for more information.
EAM: Primary or Extended Address
Bit 5 (EAM) is used for selecting the active address. Setting bit 5 to 0 will enable the primary
address. Set the primary address with CV 1 (Primary Address). CVs 17 and 18 (Extended
Address) are used to set the extended address. Set bit 5 of CV 29 to 1 to enable the extended
address. Refer to the previous section, “Configuring the Address,” for more information about
setting the extended address.
Refer to Table C on the following page to view decimal values for CV 29.
Decoder Configuration CVs
CV 29: Configuration Data 1
+1 = Bit 0 (DIR) set to 1
+2 = Bit 1 (F0) set to 1
+4 = Bit 2 (APS) set to 1
+16 = Bit 4 (STE) set to 1
+32 = Bit 5 (EAM) set to 1

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Tsunami2 Steam User’s Guide 20
Table C. CV 29 Reference
Address Type Speed Table Analog Mode Speed Steps Direction CV Value
Primary (CV1) No No 14 Normal 0
Primary (CV1) No No 14 Reversed 1
Primary (CV1) No No 28/128 Normal 2
Primary (CV1) No No 28/128 Reversed 3
Primary (CV1) No Yes 14 Normal 4
Primary (CV1) No Yes 14 Reversed 5
Primary (CV1) No Yes 28/128 Normal 6
Primary (CV1) No Yes 28/128 Reversed 7
Primary (CV1) Yes No 14 Normal 16
Primary (CV1) Yes No 14 Reversed 17
Primary (CV1) Yes No 28/128 Normal 18
Primary (CV1) Yes No 28/128 Reversed 19
Primary (CV1) Yes Yes 14 Normal 20
Primary (CV1) Yes Yes 14 Reversed 21
Primary (CV1) Yes Yes 28/128 Normal 22
Primary (CV1) Yes Yes 28/128 Reversed 23
Extended (CV 17:18) No No 14 Normal 32
Extended (CV 17:18) No No 14 Reversed 33
Extended (CV 17:18) No No 28/128 Normal 34
Extended (CV 17:18) No No 28/128 Reversed 35
Extended (CV 17:18) No Yes 14 Normal 36
Extended (CV 17:18) No Yes 14 Reversed 37
Extended (CV 17:18) No Yes 28/128 Normal 38
Extended (CV 17:18) No Yes 28/128 Reversed 39
Extended (CV 17:18) Yes No 14 Normal 48
Extended (CV 17:18) Yes No 14 Reversed 49
Extended (CV 17:18) Yes No 28/128 Normal 50
Extended (CV 17:18) Yes No 28/128 Reversed 51
Extended (CV 17:18) Yes Yes 14 Normal 52
Extended (CV 17:18) Yes Yes 14 Reversed 53
Extended (CV 17:18) Yes Yes 28/128 Normal 54
Extended (CV 17:18) Yes Yes 28/128 Reversed 55
Note: Values in Table C are shown in decimal format. If your command station requires hex
inputs, you will need to convert. Refer to Appendix A for conversions.