Thanks for finding and putting in the “DN” mode. Interestingly, on the FT-2D, the “automatic” mode is displayed as DN or FM with a line over the characters, meaning that the radio will default to trying the letter-configured mode but will automagically convert itself to the opposite one if appropriate. (It doesn’t always revert back to that automatic mode after changing itself, AFAICT.)

The Yaesu FT-1 and successors are able to handle YSF and Wires-X digital data in the DN or bar-above-FM mode. I have mapped much of the memory space for configuring these (sub?) modes, and even tried to create a settings capability via the old TK GUI interface. Although I doubt there is a burning need for this, wouldn’t it be nice to be able to at least access the settings? 

Is there any walkthrough to help one use drive the CHIRP data model and  GUI to display and configure top-level as well as hierarchical settings? Clearly, Somebody already has done that for the APRS data. and I tried using that as a model, but there’s no easy hierarchy in there.

If it looks to be not-useless to others, I may submit a ticket for this and a proposed but incomplete solution.
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Declan Rieb WD5EQY