FAQ:What is the Default Address of a Multifunction Decoder?

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Despite what many will say, the default address is not 3 (three).

From the NMRA Standards:

S-9.2.2
The default value for this Configuration Variable is 3, if the decoder is not installed in a locomotive or other unit when shipped from the manufacturer.

Therefore, the default address of three is applicable only to decoders purchased from a hobby shop.

Locomotives purchased with a multifunction decoder installed may have their default address set to any valid value. The same applies to those installed or programmed by the dealer/installer.