Each central unit is adapted to generate/read {HEAD ~ binary messages} transmitted/received in {TAIL ~ the form} of radio waves by the transmit receive module 
Each central unit is adapted to generate / read { HEAD ~ binary messages } transmitted / received in { TAIL ~ the form } of radio waves by the transmit receive module
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH