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QUOTE (Gary @ 18 Jan 2007, 12:24) <{POST_SNAPBACK}>Hornby have added a new page to their website. It seems like another very positive step in the right direction for the UK DCC market. Hornby are acknowledging that there are alternative consoles to their own products and if railway modellers use or choose alternatives for whatever reason then Hornby are advising them how to best to integrate and operate any Hornby digital products and accessories used. I find this approach refreshing:-

Happy modelling
Quote from that link "This is normal. It is not possible to read back decoder values from the R8215. This is not a fault and not a requirement of the NMRA"

I've asked other members of the NMRA DCC tech working group for comments on this, but in my opinion this is just plain wrong. If an NMRA RP (recommended Practice) is implemented at all, then it must be implemented in full. RP-9.2.2 defines a number of mandatory CVs which must be implemented for conformance. One of those, CV8, is read only. Therefore, a decoder cannot be conformant if (a) it doesn't implement a mandatory CV or (
you cannot read from a read only CV.

To claim "compatibility" is pretty meaningless when the compatibility only goes as far as the limited subset of features that the manufacturer chooses to implement.

Andrew Crosland
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