QUOTE The fact is Digitrax and a number of other American DCC companies have decided to adopt a different protocol from the Lenz Xpress Net and Railcom ID detection and this could very well be where the issue lies.
There is no standard or protocol for the bus system in DCC. Gary once again your deliberately trying to fog the issues here, or your not grasping the detail involved. This has nothing to do with control bus system employed.
However as you asked I'll relate a little DCC history.
Lenz and most of the other DCC producers did'nt want to buy into Loconet it's a Digitrax patent they would have to have paid a royality to Digitrax. They came up with Xpress net it works, its only capable of one way communication, it's needed several major software up dates. That's why Lenz based systems need a feed back bus. We also have can bus as a third standard. I can't claim to be an expert on any of them although I expect you are Gary. I don't have issues with other DCC systems, although there would be several I wouldn't touch with a barge pole and I'm not thinking of the Hornby system either.
Folks have problems programming Hornby decoders and reading back the values of CV's thats the currently the issue. Now on a £70 quid DCC system no matter who makes it, it's a feature I would be surprised to see.
But I'm surprised when folks with more suffocated kit can't read the value of CV's on Hornby's decoder. Perhaps you'd like to send me one Gary and I'll interrogate it to see what does with my system.
I am further amazed when decoders are stuffed out during programming. Now this might be a problem with the MRC kit, or the low spec on these decoders. Confidence of the punters in the product is what's at stake here. I can't imagine the folks at Hornby can be too chuffed with this. Personally I think the decoder's rating is too low on peak amps. A 9 quid decoder can quickly become and 18 quid one with a small surge in amps.
So you might as well build in some robustness even if it costs a couple of quid more. I don't buy anything on price, because the quality is always reflected in it's cost. Once again features are what make DCC systems, not cost discounts and pricing. You can judge for yourself which camp I place the Hornby system in.