Konica Minolta bizhub C451 - Manual (Page 125)

Administrator mode 3
C451 3-16
Network TWAIN
Specify the length of time until the machine’s operations are automatically
unlocked during scanning (except with PUSH scanning).
2
Note
If optional image controller IC-409 has been installed, this parameter is
not available.
Item Description
TWAIN Lock Time Specify the automatic unlocking time. (Range: 30 to 300 seconds)