Scan from the buttons on the scanner, From, Uttons – Visioneer STROBE 500 User Manual
Page 44: Canner

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S
CAN
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UTTONS
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1.
Rotate the dial on the scanner to the function number you want to use
to scan. Align the number to the registration mark on the scanner.
2.
To scan a one-sided document, press the Simplex button.
To scan a two-sided document, press the Duplex button.
In this example of duplex (two-sided) scanning, the Destination
Application is PaperPort and the two pages are stacked, one on top of
the other.
The current scan setting.