direct wiring connections between the microprocessor 46 and other system components mother board 48 and microprocessor 46 are powered by a power unit 52 which converts standard 120 volt ac power to the various voltage requirements of the various system components in a manner known in the art a battery backup unit 58 may also be optionally included mother board 48 provides a point for termination and distribution of the various communication cables used throughout the system thus as mentioned above the twisted pair connection between control unit 40 and antenna interface 20 the control wire leads 19 of remote test tag 14 and the data communication cable 50 connecting the control unit to computer 60 all route through mother board 40 as mentioned above the particular wiring and communication schemes mentioned herein are merely representative of the presently preferred embodiments it being recognized by the person of skill in the art that the particular data communication methods and control wiring schemes may be adopted in any manner known in the art provided that the herein described signals necessary to operate the system 10 are present thus for example data communication cables 50 may be rs 232 type db25 cables eia 485 metallic cables fiber optic cables or any combination thereof alternatively a wireless communication methodology utilizing digital or analog radio signals infrared signals etc may also be deployed as a matter of design choice with continued reference to fig1 and 3 control unit 40 is connected to a general purpose digital computer 60 and communicates therewith for the purpose of receiving control information therefrom and for passing information such as received pit tag id 39 s and diagnostic signals from control unit 40 if desired control unit 40 may.