Inc Sound Module Decoder - Manual

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necessary to use a low power setting for decoder programming once you have

successfully installed the decoder in the locomotive. If you are reprogramming

an installed decoder, feel free to follow the steps presented here. If you wish to

use a low power setting for decoder programming, please see the decoder ini-

tial test procedures in Section 3.7 which detail the use of a protection resistor

to provide a low power programming option.

6.0 CVs-Configuration Variables

Configuration Variables or CVs are special storage locations or “pigeonholes”

in the decoders. By programming CV values into CVs you can customize each

decoder’s performance characteristics. These characteristics are permanently

“remembered” by the decoder even when the power is off. CV values can be

changed as often as you like. The meaning of most CVs is set by industry stan-

dard. There are also some manufacturer specific CVs that are defined by each

manufacturer to accommodate their own special features. Some legacy decod-

ers do not use the same CVs that are currently in standard use.

At first glance, you will see that there are many different CVs. This may seem

confusing but, don’t worry, Digitrax decoders are shipped with a set of pre-

programmed factory default values that let you get up and running right away.

As you begin to explore the possibilities with DCC, you will probably repro-

gram CV01, the decoder’s 2 digit address. This lets you run more than one

locomotive at a time. You may need to make changes to CV29, the “configura-

tion” CV to make your lights operate correctly. Next you may decide to set up

acceleration (CV03) and deceleration (CV04) or you may wish to set up your

options using CVs 49 through 63 As you explore more of the capabilities

of your decoder and system refer to TABLE III as a guide.

Digitrax decoders use many different configuration variables (CVs) to control

the operating characteristics of the decoder. CV usage is fairly standardized

from decoder to decoder but there may be differences in how CVs are used by

different manufacturers.

To be absolutely sure about which CVs a particular decoder uses for a particu-

lar feature, the range of values available and the factory default value please

consult the specification sheet available on each decoder’s product page on

www.digitrax.com. This will give you a complete list of CV uses for each

individual decoder.

Sound projects are totally customizable and CVs may not be used consistently

from project so project. Information on CVs used in sound decoders is includ-

ed with each sound project.