User Interaction and Manual Duplex Scanning

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When the acquisition starts, an attempt is made to scan the odd pages first (pages 1, 3, 5, 7, etc.). It does not matter if the order of the odd pages as they are being acquired are ascending or descending. If the correct feeder type has been set correctly in the call to DTWAIN_SetManualDuplexMode, DTWAIN will correctly set the pages correctly. After the odd pages are scanned, the user must remove the pages, flip the stack of pages over, and then restart the scan, acquiring the even pages (2, 4, 6, 8, etc.). Again, it doesn't matter whether these pages are acquired in ascending or descending order.

For example, here is a scenario that may occur:

•	The user has a 6 page, duplex document (a total of 12 individual pages), and the manual duplex mode is turned on.

•	The user is using a document feeder that requires the pages to be placed face down.

•	The pages are fed starting from the bottom of the stack of pages in the feeder.

The user places the pages in the feeder, face down, and starts the acquisition process. DTWAIN will acquire pages 1, 3, 5, 7, 9, 11. If this is successful, the user will then turn the pages over, and restart the acquisition process. DTWAIN will then acquire pages 2, 4, 6, 8, 10, and 12. If this is successful, DTWAIN will internally combine these pages into a single 12 page multi-page image file consisting of pages 1, 2, 3, 4, 5, 6, ..., 11, 12.