Atlas 520099 Configuration Variables and their Definitions

Decoder for Atlas N Scale H15/16-44 Locomotives

Atlas Model Railroad Co., Inc.

Configuration Variables and their Definitions

The H15/16-44 decoder supports a full range of features, which are

activated by setting Configuration Variables. All CVs are numbered.

These numbers are used during programming and are identical for all

decoders that conform to NMRA standards, regardless of the decoder

manufacturer. The following table lists the CVs supported in the H15/16-

44 decoder. Both CV numbers and Register numbers are provided for

cross-reference.

Some CVs (such as CV29) have specific meanings for each bit. To

conform to the NMRA convention for bit numbering, the CV bit

assignments shown in this table use the bit-numbering scheme of 0 to 7.

H15/16-44 Decoder

CV Reg. Description Range Default

Value

1 1 Short address:

This is the number that you enter into your DCC

system to tell it which locomotive you wish to run

with a short (2-digit) address.

1-99 3

2 2 Start voltage:

This is the voltage applied to the motor in speed

step 1. Set this value so that the locomotive is

barely moving in speed step 1.

0-31 8

3 3 Acceleration Momentum:

Determines the rate of change of speed upon

acceleration. A higher value leads to a slower

acceleration.

1-255 1

4 4 Brake Momentum:

Determines the rate of change of speed upon

braking. A higher value leads to longer braking

distances.

1-255 1

- 5 Contains CV29 (see definition of CV29 below) 0-55 6

- 6 Page Register:

Normally this Register is not modified directly by

a user. For correct operation, R6 should be set to

have the value “1” after any use.

0-127 1

7 7 Version Number:

This location stores the version number of the

decoder. This CV is read-only.

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