The information given above may be confusing. I initially thought that you wish to set up a document scanner. The STMicroelectronics Biometric Coprocessor is a finger print scanner.
If you are trying to setup a document scanner I would give the scanner model and also check to see if it is a supported device on the Saned site.
As far as setting up a document scanner for a user the documentation on how to generate a scanner group is here:
http://www.openbsd.org/cgi-bin/cvswe...e=text%2Fplain
and in
Code:
/usr/local/share/doc/sane-backends/README