One such function is {HEAD ~ the prepending} of the protocol symbol to the first data byte of the message frame that occurs in response to {TAIL ~ handshaking} of the MCU 
One such function is { HEAD ~ the prepending } of the protocol symbol to the first data byte of the message frame that occurs in response to { TAIL ~ handshaking } of the MCU
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH