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