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CVs higher than 256

 
Do not attempt to use an NCE 5 amp / 10 amp / Power Pro / PH-Pro / CS02 system to program CVs>256 in Program Track Mode using the Pro Cab. You will corrupt other CVs in the decoder.
 
Your options are:
 1) Use the built in serial interface and a PC running JMRI / Decoder Pro. It knows how to work around the firmware bug in the Power Pro and it also takes care of setting the index CVs 31 & 32.
 2) Use Program on Main but you MUST first manually set the correct values in both CVs 31 & 32 BEFORE changing any CV>256.
 Depending in the type of NCE system you have AND the actual decoder, accessing and changing CVs above 256 might require a different method.

The 5amp PH-Pro has a firmware bug that prevents access to CVs above 256 on the program track ONLY. You can use POM - Programming On the Main with no issues.

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The Power Cab has no such limitations.

Depending on the decoder might need to deal with indexing too:

To access CVs above 256 you need to set one or two “indexing” CVs first.

Read this: https://dccwiki.com/Configuration_Variable#Indexed_CVs

 Thanks to NCE "Super User" Dave Heap for this information.

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