If the online
is zero, then ibonl() frees the
resources associated with the board or device descriptor
ud
. The descriptor cannot be used again after the
ibonl() call.
If the online
is nonzero, then all the settings
associated with the descriptor (GPIB address, end-of-string mode, timeout,
etc.) are reset to their 'default' values. The 'default' values are
the settings the descriptor had when it was first obtained with
ibdev() or
ibfind().