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Decoder for Atlas N Scale H15/16-44 Locomotives
15
Atlas Model Railroad Co., Inc.
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.