The security network 6 wherein one of {HEAD ~ the first and second control functions} is the master controller and {TAIL ~ the remaining control function} is a slave to the master controller 
The security network 6 wherein one of { HEAD ~ the first and second control functions } is the master controller and { TAIL ~ the remaining control function } is a slave to the master controller
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH