var instance = new Vintasoft.Twain.WebTwainDeviceDocumentFeederJS(device);

var value; // Type: Vintasoft.Twain.WebTwainDuplexModeEnumJS
value = instance.get_DuplexMode();

function get_DuplexMode() : WebTwainDuplexModeEnumJS;

Return Value

This property sends a synchronous request to get necessary information. If you want to use asynchronous request instead of synchronous request, please get information about WebTwainDeviceCapabilityIdEnumJS.Duplex capability using WebTwainDeviceJS.getCapabilityAsync or WebTwainDeviceJS.getCapabilitiesAsync function.

Reference

WebTwainDeviceDocumentFeederJS Class
WebTwainDeviceDocumentFeederJS Members