Hi Guys Hope you can save me some time. I can't find in which document the command set is for setting the PC Interface (particularly into smart mode). I want to look at this to determine what mode the PC Interface is currently in. It seems the PC Interface can be taken out of this mode (by local power failure of the C-Bus Network or the PC Interface being used for C-Bus programming) and our controller doesn't know this has been changed. Is there a mechanism for this (checking) and if so, in which document of the protocol is it published? Thanks Chris Amquad