系統上位的人機界面是用VB編程，提供人機交互操作界面及數據選擇和相應的數據處理等功能。系統上位的操作界面如圖4所示。在操作界面的左上部是通訊鏈接控制框，這里只需要正確選擇PC的串口并輸入遠程PLC所連接的號碼后即可撥號鏈接，遠程的無線GSM MODEM模塊摘機響應一般設置為鈴響后自動摘機，通訊鏈接建立后，當上位PC檢測到串口端的數據載波DCD信號后，通訊鏈接控制框中的“鏈接狀態”指示燈由紅變綠，表示通訊鏈路已建立。撥號或掛機的操作均是通過對GSM MODEM模塊發送AT指令執行的。490NAE91100網絡通訊及附件

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 　　對PLC數據的讀寫操作如操作界面的右上部所示，在相應文本框內填寫好數據的類型、地址、數值和操作方式后點擊“發送”即可執行對PLC的讀或寫操作。界面的下半部分顯示的是PC串口發送和接收的代碼以及當前操作的結果。

　　3.2 系統上位計算機的串口設置

 　　在上位PC的人機界面中，串口的設置是通過下拉選擇框選擇出所連接的串口后由程序自動讀取。在使用GSM MODEM無線模塊時，上位PC對遠程PLC鏈接呼叫時采用的是AT指令。程序語句為：MSComm1.Output=“ATDT”&Trim (Text1.Text)& vbCrLf//Text1文本框內為欲連接的號碼。掛機的AT指令為：MSComml.Output=“ATDT”&“+++”& vbCrLf。串口數據格式的設定語句為：MSComml.SetTIngs=“9600. N，8.1”，與TC35iGSM MODEM無線通訊模塊和遠程PLC自由口的串行數據通訊格式一致。

　　3.3 通訊數據格式的約定

 　　由于遠程PLC采用的是自由口用戶通訊方式，這里對每次收發數據字節暫約定為18個字節，數據字節的可根據實際需要而酌情約定。本系統中18個字節的約定：Bytel為數據的字節數;Bvte2為數據開始特征字;Bvte3為數據讀或寫特征字：Byte4為數據類型特征字;Bvte5～Byte8為PLC數據地址;Bvte9～Bytel6為PLC數據的數值;Bytel7為收發數據的校驗碼;Bvtel8為數據結束特征字。串口數據的傳輸除數據地址字節和數據數值字節用ASCII碼表示外，其他均以十六進制方式表示。因而在上位PC的編程中需涉及大量的進制轉換操作。特別要注意的是由于PLC中的實數采用32位單精度數表示，并按照ANSI/IEEE745 1985標準格式以雙字長度來存取，所以無論是上位的PC或是下位的PLC在編程時對實數數據的處理均需嚴格遵循ANSI/IEEE7451985標準格式的規定，否則將不可能讀到正確的數據。

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