An automated order mixing system includes a mixing sub-system having a plurality of angled vertically stacked product guides feeding a mixing conveyor whereon a client’s order of product cases is processed, the vertical stacking enabling the creation of a number of product feed paths within a relatively small floor space. Not only key for ciphering itself in the circuits but also the information as to which of the circuits has been used for ciphering becomes the key for ciphering. A detector circuit is coupled to the plurality of line terminals.