Here's a gotcha to look out for... We maintain a number of sites using single (5101R) and two channel (5102RVF) relays and came across this issue the other day. Using Toolkit v1.12.5 to scan the network after adding a relay produced an error saying there are duplicate units and an unravel is required. OK, so unravel - once, twice, three times to no effect. Using Toolkit v1.12.1 on another PC results in the same behavior. Order a new unit - same result. Pulling hair out now after a third unit is tried, we rolled back to Toolkit v1.11.12 and all apparently faulty units are OK. It seems once these old units are scanned and addressed using older version of Toolkit, all is good as we can go back to programming with Toolkit 1.12.5 Hopefully this is a simple fix, as one site we look after has over 50 single channel relays used for analogue dimming. Firmware verion for all units was 1.0.0 Something to be aware of and hope it helps someone else out! Regards, Mark