The serial printer interface 26 transfers {TAIL ~ the image data controlling code} to {HEAD ~ the serial printer} 16 
The serial printer interface 26 transfers { TAIL ~ the image data controlling code } to { HEAD ~ the serial printer } 16
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH