Can a CCU be used in the same DCN-NG system as a CCU2 or CCUB2?
No, this is not possible. Mixing CCUs and CCU2/CCUB2s in a DCN-NG system is not supported.
It’s also not possible to use a CCU as a spare unit in case of failure of a CCU2/CCUB2 in a DCN-NG system.
I have a custom DB9 cable that uses pins 2,3 & 5. Can I use this for serial communication from the PC to the (W)CCU?
No. You will need a full 9-pin null cable, since the (W)CCU communication on multiple pins.
Details on the RS232 connector can be found in theInstallation and User Instructions manual for version 3.1x found on the DCN-NG software ISO.