The CVs ranging from 256 – 511 have a special meaning on a LokSound decoder. These are known as ” Indexed CVs.” This means any of these CVs can change depending on the value of the so-called “Index register.” Changing the value of the index register changes the meaning and value of the CV itself. This method allows us to use every CV multiple times, resulting in an extension of available CVs.
The index register is CV 32. It can hold the values 0,1,2, or 3. You can write the index register at any time using any programming method. Based on the value of CV 32, the meaning of CV 256 – 511 is changed.
The value of the index register does not influence the meaning of all other CVs ( 1 – 255 ).
So before you read or write any of the CVs in the range of 256 – 511, please ensure that you set the index register to the correct value first.
See page 28 of the manual attached to this article.
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