The invention provides a device and method for determining whether {HEAD ~ an incrementing forcer} has stepped {TAIL ~ the proper number} of steps required by command pulses provided to the motor forcer 
The invention provides a device and method for determining whether { HEAD ~ an incrementing forcer } has stepped { TAIL ~ the proper number } of steps required by command pulses provided to the motor forcer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH