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CONFIGURATION VARIABLES
Configuration Variables, also known as CVs, receive and hold entered data that allow the
decoder to be tailored to a specific loco or accessory. Some CVs are also called registers.
The Prodigy Express
2
DCC system allows you to perform most basic programming without
having to concern yourself with CVs or registers. Of course, if you want to program CVs
to custom tailor your decoders or select certain functions, the Prodigy Express
2
has this
capability.
Most Commonly Used CVs
The CVs listed on the chart below are contained in almost all decoders, with additional
CVs for extra functions – sound or light – in more specialized decoders. See the decoder
manufacturer’s instruction manual for a list of CVs contained in that specific decoder and
what values to enter for those CVs.
A Word About CV #29
CV29 is the most important CV of the decoder. Improperly programming the CV29 may
cause decoder malfunction. We do not recommend you program CV29 yourself because
the unit will take care of it for you in most cases. When you program your decoder’s
address with Prodigy Express
2
, it will automatically program CV29. However, for some
QSI® sound decoders that talk, you need to program CV29 with value of 2 for a short
address (1-127) and program CV29 with value of 34 for a long address (128-9999). If you
want to reverse the loco’s polarity or set 14 speed steps, you have to reprogram CV29
after programming the loco’s address. Please use the following table to reprogram CV29.
The value of CV29 depends on the loco’s address.
CV #
Function
1
Short address
2
Start voltage
3
Acceleration rate (momentum)
4
Deceleration rate (momenturm)
5
Top voltage
6 Mid voltage
7
Manufacturer version #
8
Manufacturer ID #
17
Extended address - upper & lower bytes, 4 digit address
18
Extended address - upper & lower bytes, 4 digit address
19
Advance consist
29
Configuration data #1