I have an installation which was communicating perfectly well with the PC Via the USB (Gemini Bird) to serial converter to the PCI interface (Number 78669-033).I have upgraded to the latest C-Bus toolkit 1.7.4 and its just the same. The installation is working ok Now communication has stopped with the installation and when I search for networks it sees the PCI but says 'failed to identify Network' I have changed the USB to serial interface. it was on Com 3 and the new one is on Com 15 - it finds that and still says 'Failed to Identify Network' Could you give me any pointers here on where to look? Regards Graham Kemp