Hello Martin! > Planning to order a KPA100 & KAT100 to install them in EC2, > i wonder wether i need an extra KIO or will i be fine with the one > supplied with the KPA100. You need a way to get the control signals from the K2 to the EC2/KPA100/KAT100. The best way to do this is with a KIO2 in the K2. 73, Lyle KK7P