Upon detection of a trigger, such as the exceeding of an error threshold or the direction of a user, {HEAD ~ a diagnostic link system} enters {TAIL ~ a diagnostic information transmission mode} 
Upon detection of a trigger , such as the exceeding of an error threshold or the direction of a user , { HEAD ~ a diagnostic link system } enters { TAIL ~ a diagnostic information transmission mode }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL