https://dccwiki.com/How_to_program_decoders_with_CVs_over_255_using_Digitrax%3F FAQ:How to program decoders with CVs over 255 using Digitrax? - DCCWiki

FAQ:How to program decoders with CVs over 255 using Digitrax?

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Many multifunction decoders use Indexed CVs for configuring additional features.

Some Digitrax DCC Systems and/or throttles cannot program CVs over 255. Newer throttles in combination with an older command station can work with Indexed CVs.

When programming multifunction decoders, it is best to use a software package such as JMRI or a manufacturer supplied programmer.

There is a way to program ESU decoders with CVs greater than 255. See Programming ESU Decoders for details.