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8. Application Notes
Under USB CDC mode the unit works as a virtual COM port under Microsoft Windows this is handled exactly
like a real COM port including handling the control lines.
The device can be put into a lower power mode where the document scanning is disabled but can be re-
enabled in less than 1ms. This mode is controlled by the CTS line when using serial communications or
setting the virtual serial port DTR line when using USB.
Note that if the device is unplugged from the USB bus whilst opened in the program then reattached the
device will not be accessible. In this case is necessary to close the device in the program (even if an error is
returned) and unplug and reconnect the unit. If the device is closed before reconnecting then the device
should be accessible on reconnection.
