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