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