"BigWallop" wrote in message ...

I am trying to teach a young lad how to set up binary addressable fire alarm
systems and no matter how I explain it, or how much I write it down or draw
it for him, he just can't seem to grasp the concept.

Maybe he'll read his boss's description of him in uk.d-i-y; which I
suspect will be the end of the problem!

David ;-)