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SCEP certificate authorization sequence

I am trying to configured a PLC to perform a certification with a CA server but unsuccessful so far. Instead of getting into my specific configuration, could anyone provide a sample SCEP sequence of a successful session between client/server which does not use SSL? I know there are a lot of details that I just glossed over but I'm just trying to determine each step in a given simple sequence for a properly working system, so I can see where my setup "goes off the rails". Thanks!