Novint Falcon .. need continuous vibration-force??

*Hello Every One,

I have attache my falcon device to my system control by the unity 3d scripting everything is working fine rather than vibrate force.

Actually i pick up one object using the haptic and i move that object in the scene if my object is hit the wall or some static object the device should be give opposite force and do not let my object collide to that.

Now its giving vibrate force but not continuous.

what should i do for getting the constant force when my object touch the static object?

Thanks in Advance*