Thanks Erik.

Modules will be very near each other. They will solve some time critical things. One of them colects data from A/D converters do some simple math, and then pass new data to other modules for realy big and tadeus math :) And finaly, data will reach communication module, which conects equipment with PC.

And the main thing - each module must be removed, and system will work as it should be, but without extra posibilities.

I hope, you can understand idea from this short message... :)