INTERPHASE CORP 4020-000 INAV4000 6U PICMG 2.16 GIGABIT ETHERNET CPCI NETWORK數據為5 2―直置為“0”，并使+，清零，則不論9位數據（+9 8）為何值，下位機均可產生串行接收中斷，這樣9位就可作為差錯檢測的奇偶校驗位了。如上位機與某下位機通信時，發送地址碼，待握手成功后再發送數據命令，此時該下位機的FLAG被置為“”，相當于該機的“口袋”已打開，上位機不斷從該下位機中取數據，取完無誤后發出命令使該下位機中的FLAG復原為“0”，實現“關口袋”。
下位機向上位機發送數據時，發送要傳送數據的長度，然后才開始發送有效數據。
約定00H為取數命令，0FFH為復位命令，通信采用偶校驗，波特率設為2400b/s.上面給出PC機主函數的流程圖，如所示。PC機通信程序采用VC++6.0語言編寫。下位單片機的通信模塊，包括主程序和中斷服務程序，其程序流程圖分別如和所示。何實現上位機與相應發送地址相符的下位機之間通信呢，可采用軟件方法。具體方法如下：在下位機程序中設立個標志變量FLAG，初始化時FLAG置為“0”，當上位機發送數據時，各下位機均會產生接收中斷，中斷服務程序判斷本機FLAG的值。若FLAG為“0”，則把接收的數據與本機地址比較，如果，則置FLAG為6“，并發回本機地址碼作為應答，否則馬上跳出中斷服務程序；如果FLAG是”“，說明上位機發送來的是控制命令，則轉相應命令處理程序，后才跳出中斷服務程序，返回主程序。上位機與該下位機通信完畢后，再令該下位機的FLAG為”0“。如果握手失敗，則上位機發送復位命令給下位機，然后重新開始握手，三次都不成功則轉出錯處理。邁普公司作為中國專業數據通信廠商的民族品牌，20年專注于黨政、運營商、金融、工等行業的網絡通信領域。作為國內民族企業自主可控的領鋒，不遺余力研發自主可控的網絡和安全產品，采用龍芯2H芯片開發了NSS4320系列自主可控安全交換機于204年2月上市發布，在各個領域得到速的應用。
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