ADF on Dell MFP E514dw not enabling in NTWAIN

[Alic Wired]

I have a multi-function Dell MFP E514dw (printer/scanner) with ADF. ADF works fine thru Dell utility (auto-feeds and scans multiple pages). When using NTwain, single-page off flatbed works great; however I can't seem to enable ADF on it.

var enableResult = src.Capabilities.CapFeederEnabled.SetValue(BoolType.True);

always returns failure, eventhough src.Capabilities.CapFeederEnabled.CanSet is True. Other properties that fail setting are: CapXferCount, CapAutoFeed, CapAutoScan, CapAutomaticSenseMedium. However, CapFeederLoaded returns true (paper is in the feeder and LCD on Dell shows the same - ADF activated).

What could be the issue?

[Eugene Wang]

What does src.GetStatus().ConditionCode say after a failure? Maybe it's just not supported via TWAIN.

[Alic Wired]

It says Bummer

[Alic Wired]

Is there a way to see if this capability is supported via TWAIN?

[orkun yaşar]

it is same to us with Canon Image Runner 1435if.

If I scan the document with NTwain Application, My scanner(using adf and flatbed together) scan it but; I can't active Adf to scan. I want to scan document with ADF but the scanner use flatbed for scan proccess. How can I use ADF for scan proccess ?

When I try to set '_twain.CurrentSource.Capabilities.CapFeederEnabled.SetValue(BoolType.True); ' , it throw exception. Even tough _twain.CurrentSource.Capabilities.CapFeederEnabled.CanSet is true.

Also , i try showUI enable , it send data to my app with adf. _twain.CurrentSource.Enable(SourceEnableMode.ShowUI, false, this.Handle) == ReturnCode.Success)