pd91223 Posted July 1, 2018 Share Posted July 1, 2018 See picture below - once it's approved. I've just removed this 8-pin DCC decoder from a Hornby R2760 Class 20 in preparation for fitting a TTS Sound Decoder (R8118). The decoder was previously not recognised by RailMaster (v1.69.2) + Elink although I was able to change the DCC ID ok and the loco ran fine. I'd like to know what the decoder is for future reference. Any ideas? Any reason why it would not have been recognised? PS Couldn't decide whether this should be in the DCC Forum or the RailMaster Forum - apologies if chosen wrongly! /media/tinymce_upload/b29bd370fd6a7d7739a54603a7a64873.JPG Link to comment Share on other sites More sharing options...
96RAF Posted July 2, 2018 Share Posted July 2, 2018 Looks like a Hornby R8249 or possibly the earlier R8215 https://goo.gl/images/QMxKPK Try forcing RM to list it as a Hornby standard four function decoder and see what Cv7 and 8 read back as. Rob Link to comment Share on other sites More sharing options...
pd91223 Posted July 2, 2018 Author Share Posted July 2, 2018 Thanks, Rob Just tried forcing to R8215, R8249 or "Factory Fitted". I can write a new ID, but when trying to read back the CVs they all read as 255, including CV1. CV7 & CV8 are not read. I've tried writing 8 to CV8, but exactly the same happens. Paul Link to comment Share on other sites More sharing options...
pd91223 Posted July 2, 2018 Author Share Posted July 2, 2018 Is there any significance in the purple wire not being connected - see picture? Link to comment Share on other sites More sharing options...
Rog RJ Posted July 2, 2018 Share Posted July 2, 2018 The R8215 could not be read back from, reading back from these decoders wasn't supported, which would explain why RM doesn't recognise it and the 255 values. It's an old decoder that was superceded by the R8249 due to its limited capabilities and problems. The purple wire is never connected to the 8 pin plug because the purple wire is wire number 9 and there is no place for it on the 8 pin plug - simples. 😉 Link to comment Share on other sites More sharing options...
RDS Posted July 2, 2018 Share Posted July 2, 2018 It sounds like the decoder is faulty. I had exactly the same problem with the earlier R8215 Hornby Decoders where it appeared that the ID had been changed but it hadn't or it 'forgot' it after switching off and needed to be reset each time it was powered up. Link to comment Share on other sites More sharing options...
pd91223 Posted July 2, 2018 Author Share Posted July 2, 2018 Thanks Rog, that explains a lot! ... and RDS I had that problem with it too! The R2760 was only bought recently second hand, so I haven't tested it much. Oh well, I'll keep the decoder to test other DCC Ready 8-pin locos that I buy before replacing it with a more up-to-date one or sound. Many thanks. Paul Link to comment Share on other sites More sharing options...
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