A5E30947477產(chǎn)品說明：
A5E30947477
調(diào)制解調(diào)器工作方式和設(shè)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(jī)模式。當(dāng)調(diào)制解調(diào)器沒有和其它設(shè)備連接時(shí)，其處于命令模式，這時(shí)下達(dá)給調(diào)制解調(diào)器的指令時(shí)作調(diào)制解調(diào)器本身設(shè)定或者動(dòng)作用的。當(dāng)調(diào)制解調(diào)器已經(jīng)和其它的設(shè)備連接上時(shí)，此時(shí)調(diào)制解調(diào)就是處于聯(lián)機(jī)模式，所有在此時(shí)由計(jì)算機(jī)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(shè)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(shè)置的改變，都可以由VB經(jīng)過串行端口而對(duì)調(diào)制解調(diào)器下達(dá)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(biāo)準(zhǔn)。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(cè)計(jì)算機(jī)串行通訊口發(fā)送信號(hào)的速率,識(shí)別字符格式,包括字符長(zhǎng)度和奇偶設(shè)定等。 調(diào)制解調(diào)器撥號(hào)之后,等待對(duì)方調(diào)制解調(diào)器送來的載波信號(hào)。如果在一給定時(shí)間內(nèi)沒有檢測(cè)到載波, 調(diào)制解調(diào)器自動(dòng)釋放線路并送回結(jié)果碼NOCARRIER，如果檢測(cè)到載波信號(hào), 調(diào)制解調(diào)器即送結(jié)果碼CONNECT + 波特率,就進(jìn)入聯(lián)機(jī)狀態(tài),即可與遠(yuǎn)方系統(tǒng)進(jìn)行通訊。
PLC連接調(diào)制解調(diào)器原理及其設(shè)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(dòng)撥號(hào)，另外，在確認(rèn)調(diào)制解調(diào)器和PLC的調(diào)制解調(diào)器聯(lián)機(jī)成功后控制它進(jìn)入聯(lián)機(jī)模式，開始存取PLC數(shù)據(jù)。主站控制調(diào)制解調(diào)器撥號(hào)連接細(xì)節(jié)見下節(jié)，這里詳述PLC端對(duì)調(diào)制解調(diào)器的設(shè)置方法。 PLC端PLC上電后必須初始化調(diào)制解調(diào)器，設(shè)置成自動(dòng)應(yīng)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(dòng)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(shè)定或者設(shè)定特殊暫存器R4149的高八位為55H就可以把Port1設(shè)置為調(diào)制解調(diào)器專用界面，在該界面下PLC會(huì)啟用“MODEM驅(qū)動(dòng)程序”，此時(shí)，雖CPU仍然使用永宏〝標(biāo)準(zhǔn)通訊驅(qū)動(dòng)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(jī)，在通訊進(jìn)行前，Por t1主控權(quán)是交由〝MODEM驅(qū)動(dòng)程序〞管理，此時(shí)無法對(duì)PLC作任何存取動(dòng)作?！癕ODEM驅(qū)動(dòng)程序”即將調(diào)制解調(diào)器設(shè)為接收模式，并等待遠(yuǎn)方調(diào)制解調(diào)器撥號(hào)進(jìn)來，一旦收發(fā)雙方調(diào)制解調(diào)器聯(lián)機(jī)成功，則PLC立即脫離接收模式，而進(jìn)入聯(lián)機(jī)狀態(tài)，Port1控制權(quán)交由永宏〝標(biāo)準(zhǔn)通訊驅(qū)動(dòng)程序〞管理。此時(shí)遠(yuǎn)方調(diào)制解調(diào)器便可任意存取或控制此PLC主機(jī)了。
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