received by the master radio the repeater radio is used to expand the range of the master radio the repeater radio just hops any message received by the master and or slave radio as used herein a master host computer is a computer with software that has access u201c connectivity u201d to a data radio the software in the master host computer will transfer data to and from any rtus in the radio network through the data radio there is normally only one master host computer in the radio network all other computers in the radio network are known as slave devices or slave computers as used herein a slave host computer is a computer with software that has access u201c connectivity u201d to a data radio the software in the slave host computer will transfer data to and from one or more rtu in the radio network through the data radio there can be multiple numbers of slave host computers in the practice of the present invention every computer will have an assigned address that makes it unique in the network all data messages transferred by any computer on the radio network contains the address of the source computer and the destination computer referring to the flow charts of fig3 and 4 the present.