Hi P-Henny and 96RAF Thank you both so much for clarifcation of connection of the R8247 very much appriciated I noted some place???!! Some decoders have a R8216 label, but are actually R8247 If stamped 50/07 on body they are actually R8247!! Maybe you could confirm The one's I have obtained from various souces all have the 50/07 marking Hope this is OK The Select I have when powered up displays 20, followed by 30 then 03 ready to go, box states 'Now fitted with Updated Firmware Version 6' I also have second Select which has a faulty LED display (not all digits cal be read) which i understand cannot be repaired. Is it possible to use the Select in another way or should i just discard it as knackered Thanks again for reply's found them very useful indeed