I have a problem trying to program B&K Multi zone units. I cant get my laptop to connect to the unit. No matter what I try, letting the B&K software scan the com ports for the B&K or manually configuring the software, I cant get it to connect. My laptop doesn't have a serial port so I am using a Belkin USB to serial adapter connected to the B&K serial to cat adapter. I called B&K and they were no help. I use the USB to serial adapter to program the B&K keypads, and Elan systems. Anyone have any suggestions?