The data communicating between the data sampling unit and the computer adopts RS485 fieldbus. At the same time, the communication protocols and RS485 communication interface are designed.
前端数据采集装置和后台上位机之间数据通信采用RS485总线，设计了RS485通信接口电路和通信协议。
Because this system USES computer as center control unit, so sampling, analyzing and data processing are more easy.
由于采用了计算机作为中央处理单元，使采样分析处理数据更为灵活。
Method: We adopted different level and wholly type sampling and letter investigation for 242 person who works in 84 medical unit, We analyzed 225 people's data (92. 97% ) .
方法：采用分层抽样与整体抽样对84个医疗单位242人进行信访调查，并对资料完整的225人（92.97%）进行分析。
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