SilverFast Ai Studio 9 allows you to select in which order the frames are sorted when using the automatic frame search or the SAC.
The selection can be found in the Preferences' Auto tab:
The frame sorting specifies in which corner (1) the numbering starts and in which direction it is done (2).
So this starts in the top left corner and then numbers to the right. Then the numbering continues from left to right in the next line.
Starts at the top left and numbers down. Then numbering continues from top to bottom in the next column.
Starts at the bottom left and numbers up. Then numbering continues in the next column from bottom to top.
This mainly affects film and slide holders that can hold material in multiple rows and columns.
Be sure to always load the film material according to the instructions for use of the particular holder. For film strip holders, the material must be placed against one side and not in the center.