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System Overview
Chapter 6 Theory of Operation 49
6
Theory of Operation
System Overview
The boards and their interconnections are shown in the following figure.
The CPU board, which has overall control of the entire system, contains flash EPROMs
containing all the system software. The software for the Combined Interface Board (if one is
fitted) is loaded from this ROM area.The signals from the transducers receive some analog
conditioning on the Front End Board and are then digitized on the CPU Board. The CPU
Board includes a digital signal processor. The results of the processing are distributed to the
outputs (for example, the Recorder, “traffic lights” and Combined Interface Board).