The servo amplifier 188 also receives {HEAD ~ a signal} on {TAIL ~ line} 192 from a change detector 194 which will initially be at the 3 volt level, i.e. the signal level representing the desired workpiece dimension 
The servo amplifier 188 also receives { HEAD ~ a signal } on { TAIL ~ line } 192 from a change detector 194 which will initially be at the 3 volt level , i.e. the signal level representing the desired workpiece dimension
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH