A5E30947477產(chǎn)品說明：
A5E30947477
調(diào)制解調(diào)器工作方式和設定 3.1 調(diào)制解調(diào)器工作原理 調(diào)制解調(diào)器分成兩種模式，命令模式和聯(lián)機模式。當調(diào)制解調(diào)器沒有和其它設備連接時，其處于命令模式，這時下達給調(diào)制解調(diào)器的指令時作調(diào)制解調(diào)器本身設定或者動作用的。當調(diào)制解調(diào)器已經(jīng)和其它的設備連接上時，此時調(diào)制解調(diào)就是處于聯(lián)機模式，所有在此時由計算機送到調(diào)制解調(diào)器的訊息都將由經(jīng)電話線傳送到其它設備上。 用于控制調(diào)制解調(diào)器的特定指令集被稱為“AT指令集”，通過該指令集，從最基本的音量控制到內(nèi)建參數(shù)設置的改變，都可以由VB經(jīng)過串行端口而對調(diào)制解調(diào)器下達控制指令。AT命令集是調(diào)制解調(diào)器通訊接口的工業(yè)標準。所有的AT命令都以字符AT開始,作為前綴。前綴AT用以引起調(diào)制解調(diào)器的注意（Attention）檢測計算機串行通訊口發(fā)送信號的速率,識別字符格式,包括字符長度和奇偶設定等。 調(diào)制解調(diào)器撥號之后,等待對方調(diào)制解調(diào)器送來的載波信號。如果在一給定時間內(nèi)沒有檢測到載波, 調(diào)制解調(diào)器自動釋放線路并送回結(jié)果碼NOCARRIER，如果檢測到載波信號, 調(diào)制解調(diào)器即送結(jié)果碼CONNECT + 波特率,就進入聯(lián)機狀態(tài),即可與遠方系統(tǒng)進行通訊。
PLC連接調(diào)制解調(diào)器原理及其設置 在該系統(tǒng)中， PC做為主站，必須控制調(diào)制解調(diào)器主動撥號，另外，在確認調(diào)制解調(diào)器和PLC的調(diào)制解調(diào)器聯(lián)機成功后控制它進入聯(lián)機模式，開始存取PLC數(shù)據(jù)。主站控制調(diào)制解調(diào)器撥號連接細節(jié)見下節(jié)，這里詳述PLC端對調(diào)制解調(diào)器的設置方法。 PLC端PLC上電后必須初始化調(diào)制解調(diào)器，設置成自動應答來電狀態(tài)。在這里把PLC初始化調(diào)制解調(diào)器的AT指令組合稱為“MODEM驅(qū)動程序”。永宏P(guān)LC通過Port1來控制調(diào)制解調(diào)器，并把這種軟件界面稱為調(diào)制解調(diào)器專用界面。如圖2設定或者設定特殊暫存器R4149的高八位為55H就可以把Port1設置為調(diào)制解調(diào)器專用界面，在該界面下PLC會啟用“MODEM驅(qū)動程序”，此時，雖CPU仍然使用永宏〝標準通訊驅(qū)動程序〞來管理Port1的通訊，但必須通過調(diào)制解調(diào)器來聯(lián)機，在通訊進行前，Por t1主控權(quán)是交由〝MODEM驅(qū)動程序〞管理，此時無法對PLC作任何存取動作?！癕ODEM驅(qū)動程序”即將調(diào)制解調(diào)器設為接收模式，并等待遠方調(diào)制解調(diào)器撥號進來，一旦收發(fā)雙方調(diào)制解調(diào)器聯(lián)機成功，則PLC立即脫離接收模式，而進入聯(lián)機狀態(tài)，Port1控制權(quán)交由永宏〝標準通訊驅(qū)動程序〞管理。此時遠方調(diào)制解調(diào)器便可任意存取或控制此PLC主機了。
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