mmm, ….
you don’t set CAP_DULPEX (chapter 9, 9-371 – set not allowed), it indicates whether the scanner supports duplex; you set CAP_DUPLEXENABLED.
Maybe if you post more details of what you’re doing, and where you think its going wrong i/we can offer more help.
What do you mean by ‘not ok’?
What does CAP_DUPLEX return?
Are you gettnig an RC =FAILURE or a CC = CAPUNSUPPORTED from CAP_DUPLEXENABLED?
gabe