There is a small SMD resistor on the back of the circuit board marked with the number '''D.C.'''.
Next to it is an empty solder pad marked with '''RDY'''. Desolder the resistor and move it to the RDY-Position. The drive now outpus outputs a RDY-Signal.
Additional information and pictures at [http://www.sax.de/~zander/bic/bic_tip.html] (german, but at least the picture is helpful)