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