SoundTraxx DSD-150/DSX Owners Manual User Manual
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Digital Sound Decoder Owner's Manual
What is a CV?
CV stands for Configuration Variable which is the industry adopted term for a decoder’s user-programmable memory
locations. CVs allow you to customize individual decoder properties such as the address, momentum, throttle re-
sponse, sound volume and much, more. Once a CV has been programmed, it will be permanently remembered even
after the power has been turned off. A CV can be modified as often as necessary by simply reprogramming it with
a new value.
The NMRA has defined over 70 standard CVs and their usage in RP-9.2.2. Most of these CVs have been uniformly
implemented by the various DCC component manufacturers including SoundTraxx resulting in a high degree of
interoperability, particularly with products designed after July, 1995 when the standards and recommendations were
formally agreed upon. For example, the decoder’s primary address is always stored in CV 1. Be aware that there are
also a number of CVs which have been designated as “Reserved for Manufacturer Use” allowing the manufacturer to
add a feature that is unique to their products. The SoundTraxx DSD has several such CVs used primarily for custom-
izing the sound and lighting effects.
With the large number of CVs available, first inspection of the available options may cause confusion and perhaps
even a brain-cramp! Take an aspirin and relax.
The DSD has been shipped with all CVs pre-programmed so you can begin using your locomotive
immediately without having to worry about what adjustments to make.
Table A summarizes the DSD’s default operating characteristics as shipped. Simply set your controller to address 03
and away you go! Be sure to also set your controller for 28 speed step mode or the headlights may not operate as
expected.
Table A.
SoundTraxx DSD Default Operating Characteristics
Address = 03
Vstart = 7
Acceleration = 0
Braking = 0
Consist Addressing = Off
Speed Steps = 28
Speed Tables = Not used
Lighting Control = Automatic Direction Control
F1 Effect = On/Off
F5 Effect = On/Off
Audio Volume = 50%
Background Sounds = All on.
Exhaust Synchronization Source = Exhaust Cam
Function Mapping:
FL = headlight (forward) and Backup (reverse) Light On/Off
F1 = F1 Function Output
F2 = Whistle
F3 = Bell
F4 = Hiss
F5 = F5 Function Output
F6 = Dynamo Sound On/Off
F7 = Coupler Sound Trigger
F8 = Audio Mute