{HEAD ~ The source unit} has {TAIL ~ a check data unit} generating at least one check datum for control data for the medical device , and a transmitting unit transmitting the control data and the check datum to the collection unit  
has
{ HEAD ~ The source unit } has { TAIL ~ a check data unit } generating at least one check datum for control data for the medical device , and a transmitting unit transmitting the control data and the check datum to the collection unit
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH