To check if a scanner is duplex (or double-sidded) enabled, the duplex property (of Atalasoft.Twain.Device) can be checked to tell you what is supported by the device.
- none: duplex scanning is not supported
- one-pass: duplex is supported, both sides are scanned in one pass
- two-pass: duplex is supported, each side is scanned one at a time
In contrast, the DuplexEnabled property must be set to true to enable the duplex scanning feature. To turn duplex scanning off, just set it to false.
Original Article:
Q10108 - FAQ: How can I check for or enable duplex scanning?