| This dissertation design a multi-function and general -use intelligent far-distance communication device, based on the instrument technology developed in the last years and development requirement of intelligent instrument in the future. This device realize digital far distance transmission and easily to fulfill far distance controlling , which is different from former intelligent transducer. At the same time, the device possesses various kinds of function, easily connected to all types of indication instrument. .First, the dissertation discuss overall configuration of the system, then give a detailed expatiation on system hardware and software. Based on that, the front-placed chunnel and serial communication has been designed with special character.In the dissertation, serial communication of MCU and PC is introduced, display interface is designed by VB language, far distance controlling realized by PC is introduced too. The system has a lot of advantages: high accuracy, high reliability, simple circuits configuration, low cost and so on, therefore it must have widely development future. Meanwhile, in order to improve reliability of the device, some anti-interfere measures of hardware and software has been adopted in the design, good result has been achieved in the debugging.In the last part of this dissertation, data far distance transmission is introduced based on fieldbus, which meet the future tendency of instrument.
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