系統(tǒng)上位的人機(jī)界面是用VB編程，提供人機(jī)交互操作界面及數(shù)據(jù)選擇和相應(yīng)的數(shù)據(jù)處理等功能。系統(tǒng)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(yuǎn)程PLC所連接的號碼后即可撥號鏈接，遠(yuǎn)程的無線GSM MODEM模塊摘機(jī)響應(yīng)一般設(shè)置為鈴響后自動摘機(jī)，通訊鏈接建立后，當(dāng)上位PC檢測到串口端的數(shù)據(jù)載波DCD信號后，通訊鏈接控制框中的“鏈接狀態(tài)”指示燈由紅變綠，表示通訊鏈路已建立。撥號或掛機(jī)的操作均是通過對GSM MODEM模塊發(fā)送AT指令執(zhí)行的。490NAE91100網(wǎng)絡(luò)通訊及附件

廈門仲鑫達(dá)自動化設(shè)備有限公司

：李素云

企業(yè)QQ：，2851195466

手機(jī)：

：

　　對PLC數(shù)據(jù)的讀寫操作如操作界面的右上部所示，在相應(yīng)文本框內(nèi)填寫好數(shù)據(jù)的類型、地址、數(shù)值和操作方式后點擊“發(fā)送”即可執(zhí)行對PLC的讀或?qū)懖僮?。界面的下半部分顯示的是PC串口發(fā)送和接收的代碼以及當(dāng)前操作的結(jié)果。

　　3.2 系統(tǒng)上位計算機(jī)的串口設(shè)置

　　在上位PC的人機(jī)界面中，串口的設(shè)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(yuǎn)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(nèi)為欲連接的號碼。掛機(jī)的AT指令為：MSComml.Output=“ATDT”&“+++”& vbCrLf。串口數(shù)據(jù)格式的設(shè)定語句為：MSComml.SetTIngs=“9600. N，8.1”，與TC35iGSM MODEM無線通訊模塊和遠(yuǎn)程PLC自由口的串行數(shù)據(jù)通訊格式一致。

　　3.3 通訊數(shù)據(jù)格式的約定

　　由于遠(yuǎn)程PLC采用的是自由口用戶通訊方式，這里對每次收發(fā)數(shù)據(jù)字節(jié)暫約定為18個字節(jié)，數(shù)據(jù)字節(jié)的可根據(jù)實際需要而酌情約定。本系統(tǒng)中18個字節(jié)的約定：Bytel為數(shù)據(jù)的字節(jié)數(shù);Bvte2為數(shù)據(jù)開始特征字;Bvte3為數(shù)據(jù)讀或?qū)懱卣髯郑築yte4為數(shù)據(jù)類型特征字;Bvte5～Byte8為PLC數(shù)據(jù)地址;Bvte9～Bytel6為PLC數(shù)據(jù)的數(shù)值;Bytel7為收發(fā)數(shù)據(jù)的校驗碼;Bvtel8為數(shù)據(jù)結(jié)束特征字。串口數(shù)據(jù)的傳輸除數(shù)據(jù)地址字節(jié)和數(shù)據(jù)數(shù)值字節(jié)用ASCII碼表示外，其他均以十六進(jìn)制方式表示。因而在上位PC的編程中需涉及大量的進(jìn)制轉(zhuǎn)換操作。特別要注意的是由于PLC中的實數(shù)采用32位單精度數(shù)表示，并按照ANSI/IEEE745 1985標(biāo)準(zhǔn)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(shù)數(shù)據(jù)的處理均需嚴(yán)格遵循ANSI/IEEE7451985標(biāo)準(zhǔn)格式的規(guī)定，否則將不可能讀到正確的數(shù)據(jù)。

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