Abstract: From the perspective of practical application,it introduces the design and implementation of the distributed heterogeneous system three-level Measure & Control networks used in an electrical wiring equipment limited corporation.The existing defects of Measure & Control networks and management modes in enterprise are pointed out.The whole design concept,structure,function,as and the design of software,hardware and transmission lines are discussed.It focuses on how to use the Delphi 7.0 to...

Key words: RS-485 field bus； Delphi； serial communication； ADO/SQL database； Asp.net；