ic693pwr330b
基于EPA標準的閥門定位器通信卡熱案件設計采用基于模塊化的設計方法，軟件開發(fā)主要分成三個部分：現(xiàn)場設備數(shù)據(jù)采集模塊、ZIGBEE無線通信模塊、EPA協(xié)議模塊。具體軟件設計流程圖如圖3所示：
圖3通信卡軟件設計流程圖
2．2．1現(xiàn)場設備數(shù)據(jù)采集模塊
閥門定位器采用的是現(xiàn)場總線式閥門定位器，它接受數(shù)字信號并使用數(shù)字式電子線路配合機械部件來定位閥門，全數(shù)字控制信號取代模擬控制信號，可通過將軟件命令植入閥門定位器存儲模塊來進行雙向數(shù)字通信。
閥門定位器數(shù)據(jù)的采集實質(zhì)上是通信卡與閥門之間的雙向通信過程，系統(tǒng)初始化后通信卡通過UART0向閥門發(fā)送連接命令，等待連接成功后，向閥門發(fā)送讀／寫數(shù)據(jù)信息，寫入成功后，閥門返同相應數(shù)據(jù)信息。讀，寫數(shù)據(jù)命令格式如下：
其中0X01為讀數(shù)據(jù)指令，0X02為寫數(shù)據(jù)指令，占一個字節(jié)；Address（H）和Address（L）代表讀，寫閥門定位器數(shù)據(jù)所在內(nèi)存地址高低字節(jié)．共占兩個字節(jié)，可根據(jù)需要返回的數(shù)據(jù)設置此地址、數(shù)據(jù)主要有閥位、電流閥位上下限等。0X04為返回數(shù)據(jù)字節(jié)數(shù)，CRC為奇偶校驗，各占一個字節(jié)。
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