the group of output signals consisting of the first nodal output signal 40 and the second nodal output signal 41 to create the second gateway output signal 61 and creating a storable representation of the second gateway output electrical signal 61 this at least one second gateway programmable gateway processor 281 is also responsible for generating a nodal output signal message received signal selected from the group of nodal output signal message received signals consisting of the first nodal output signal message received signal 50 and the second nodal output signal message received signal 51 for processing the first gateway output signal 60 and generating the first gateway output signal message received signal 70 and for processing the control center programming signal 80 analogous to the function of comparable features in the at least one first gateway 200 there is a second gateway storage device 291 for storing the storable representation of the second gateway output signal 61 similarly there is at least one second gateway transmitter 261 for transmitting a gateway output signal selected from the group of gateway output signals consisting of the first gateway output signal 60 and the second gateway output signal 61 for transmitting a nodal output signal message received signal selected from.