KB236: CV29 - 2-digit or 4-digit Addressing

This article was last updated on Jan. 13, 2012, 10:01 a.m. | Print Article | Leave Feedback


CV29 is assigned a single value which chooses a combination of specific effects:

1. Speed step control.

2. Speed table On or Off.

3. Analog mode conversion On or Off.

4. Normal Direction of Travel (NDOT).

5. 2 digit addressing or 4 digit addressing.

2-digit or 4-digit Addressing

The decoder's address is the identification number programmed into specific decoder that lets that decoder recognize commands sent to it by the command station.

Once you program the decoder's address, it will be remembered in the decoder until you re-program it.

All Digitrax current production decoders can be set up with both 2 digit and 4 digit addresses but only one or the other will be in use at any time.

Early release Digitrax decoders that have 2 digit capability only; these would be: DN93, DN82, DG83, DH83, DH83F, DH8FG, DH84, DH82.

You can change the decoder address by reprogramming it at any time, so you can set up any numbering scheme you choose for your locos.

Many people assign the last two numbers of the loco's road number as the decoder address.

You can program more than one loco to the same address.

This is useful if you want to set up a basic consist and run several locos on a single address; you can also MU the locomotives for an operating session.

The Range of Digital Addresses:
Address "00" is reserved for analog operation.

All Digitrax command stations give you easy access to analog operation so you can run a locomotive without a decoder on the same track where you run your DCC equipped locos.

Addresses from 001 to 127 are the two digit address range.

All Digitrax decoders have two digit address capability.

Two digit decoder addresses are set up by programming CV01 & CV29.

Addresses from 0128 to 9983 are the four digit address range.

All current production Digitrax decoders also offer four digit address capability.

Four digit decoder addresses are set up by programming CV17, CV18 & CV29.

This process is automated in Digitrax command stations.

See your system manual for programming procedures for 4 digit addresses.

Decoder 2 Digit Address: CV01 & CV29
The 2 digit address is the short identification number for a specific decoder.

It is programmed in CV01.

When you access CV01 with DT100 throttles, the display will show Ad, instead of 01 when you dial up CV01 to program the 2 digit address.

Ad stands for Address.

Simply dial in the address number you want to program complete the programming sequence described in your starter set manual.

On DT300 & DT400 throttles, the display will show Ad2 for two digit addresses and Ad4 for four digit addresses.

All other CVs are displayed as numbers on Digitrax throttles.

Be sure that CV29 is programmed to enable 2 digit addressing.

4 Digit Decoder Addresses: CV17, CV18 & CV29
The 4 digit address is the long address for a specific decoder.

It is programmed in CV17, CV18 & CV29.

CV18 is the first two digits and CV17 is the second two digits of the address.

Simply programming CV17 & CV18 will not enable 4 digit addressing.

The Digitrax Command Stations provide automated programming that makes this process simple.

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