The master continues to poll another slave while data comes into {HEAD ~ the slave} at {TAIL ~ time slot} 4 
at
The master continues to poll another slave while data comes into { HEAD ~ the slave } at { TAIL ~ time slot } 4
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH