I have looked in the manual I have and it just shows the picture above and not where each wire connects toThey used to sell LS decoders with the 10 pin interface cable fitted but not any more, you have to buy the interface cable separately and solder it yourself. A bit tricky and nerve wracking. I bought mine frommuns and he did it for me.
I thought the LS installation manual gave you the required pin layout?
Bingo that’s the one!You're right they have left out some vital information!
I found this on the Massoth Wiki which I think is what you are looking for:
https://www.massoth.de/wp-content/uploads/2019/11/LS_an_DCC_Schnittstelle.pdf
Note there are different diagrams for old (alte) and new (neue) models of the LS decoder.