Hello and thank you for your lengthy reply. The decoders fitted are said to be NMRA compliant, are 8 pin and as fitted from new but I don’t know the product number. I believe the set may be 4 years or more old. The person who I got the set from did say he couldn’t get it to work from new. Why he didn’t take it back to the shop, I don’t know. My controller is, I believe, from a relatively small niche company, as you said but I don’t know if the software is up to date, I shall do some research but it does read and write to all my other decoders. I am reluctant to try the elink option as I am not at all computer literate and do struggle sometimes with the dcc operating system, lol. Thanks again, Paul