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class="tigs"> 發(fā)信息做推廣就找產(chǎn)品網(wǎng)<br />企業(yè)電商信息綜合服務平臺 </span><div id="nyigwvk" class="searchbox"><div id="5o2d2xn" class="searchLt"><div id="jlw05w2" class="tabs"><a href="JavaScript:;" data-type="product" class="active">產(chǎn)品</a><a href="JavaScript:;" data-type="member" class="">公司</a><a href="JavaScript:;" data-type="article" class="">資訊</a><a href="JavaScript:;" data-type="exhibition" class="">展會</a></div><div id="jmxzigb" class="clearfix searchWrap"><div id="pfde7s3" class="searchInput"><input type="text" name="keywords" placeholder="請輸入搜索關鍵詞" id="kd"><a href="javascript:void(0)" class="searchBtn" id="search">搜索</a></div></div></div></div></header><nav class="navbox"><div id="fr7jwaf" class="container"><ul><li id = "index_index"><a href="http://www.cdcfah.com/"><span>首頁</span></a></li><li id = "index_company"><a ><span>企業(yè)名錄</span></a></li><li id = "index_product"><a href="http://www.cdcfah.com/cp/"><span>產(chǎn)品供應</span></a></li><li id = "index_news"><a 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src="http://tyunfile.71360.com/UpLoadFile/2019/8/20/11/637018976233383071_nhsdo_2282667.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="pw0fvj2" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/8/20/11/637018976233383071_nhsdo_2282667.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="f7p1vat" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>河北省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關鍵詞：</span>黑龍江**GPRS-dtu外殼</p><p><span>***更新：</span>2020-06-01 03:50:43</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="zl7slnt" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">滄州萬瑞電子機箱有限公司</a></p><p><span>聯(lián)系人：</span>李文超</p><p><span>郵箱: </span>2816163037@qq.com</p><p><span>電話: </span>19103271861</p><p><span>傳真: </span>0317_4371300</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>0317-4371300</p><p><span>地址: </span>河北省滄州市青縣農(nóng)場四分場</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="sozhrvl" class="page-proshow02"><p class="title">詳細說明</p><div id="u07aqva" class="box"><p><p style="text-indent:25px">11. 交通指示 12. 煤炭監(jiān)控 13. 地震監(jiān)測 14. 車輛誘導 15. 供水監(jiān)控 16. 高速公路監(jiān)測 17. 噪聲實時監(jiān)控 18. 環(huán)保重點污染源監(jiān)控 19. 供水管網(wǎng)實時傳輸監(jiān)控 20，黑龍江**GPRS-dtu外殼. 電力配網(wǎng)主動化遙控體系 21. 各類國內(nèi)外帶串口或485接口的PLC，RTU完成無線數(shù)據(jù)傳輸?shù)? DTU通訊的實質(zhì) GPRS DTU**基本的用法是：在DTU中放入一張開通GPRS功用的SIM卡，DTU上電后先注冊到GPRS網(wǎng)絡，然后經(jīng)過GPRS網(wǎng)絡和數(shù)據(jù)處理中心樹立銜接，黑龍江**GPRS-dtu外殼，黑龍江**GPRS-dtu外殼。這條銜接觸及了無線網(wǎng)絡運營商，因特網(wǎng)寬帶供貨商，用戶公司的網(wǎng)絡狀況，以及用戶的電腦裝備等環(huán)節(jié)，因而要樹立這條銜接需求把各部分都裝備好。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="黑龍江**GPRS-dtu外殼" src="http://tyunfile.71360.com/UpLoadFile/2019/8/20/11/637018976233383071_nhsdo_2282667.jpg"></div><p style="text-indent:25px">DTU發(fā)送的懇求信息是因特網(wǎng)上的數(shù)據(jù)包，有一些原因會阻止中心收到銜接懇求包，這樣也就不能樹立銜接。**常見的有中心的電腦上有殺毒軟件、防火墻等把這些數(shù)據(jù)包給屏蔽了。另一是中心電腦是經(jīng)過路由器上網(wǎng)的，在路由器上要設置數(shù)據(jù)轉發(fā)。SOCKET銜接樹立后就可以雙向通訊了。作業(yè)進程 GPRS DTU上電后，首要讀出內(nèi)部FLASH中保存的作業(yè)參數(shù)（包含GPRS撥號參數(shù)，串口波特率，數(shù)據(jù)中心IP地址等等，事前現(xiàn)已裝備好）。 GPRS DTU登陸GSM網(wǎng)絡，然后進行GPRS PPP撥號。撥號成功后，GPRS DTU將取得一個由移動隨機分配的內(nèi)部IP地址(一般是10.X.X.X)。也便是說，GPRS DTU處于移動內(nèi)網(wǎng)中，而且其內(nèi)網(wǎng)IP地址通常是不固定的，隨著每次撥號而變化。咱們可以理解為GPRS DTU這時是一個移動內(nèi)部局域網(wǎng)內(nèi)的設備，經(jīng)過移動網(wǎng)關來完成與外部Internet公網(wǎng)的通訊。這與局域網(wǎng)內(nèi)的電腦經(jīng)過網(wǎng)關拜訪外部網(wǎng)絡的辦法類似。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="黑龍江**GPRS-dtu外殼" src="http://tyunfile.71360.com/UpLoadFile/2019/8/20/11/637018981913015478_nhsdo_9205477.jpg"></div><p style="text-indent:25px">支持自動心跳，保持長久在線 GPRS通信網(wǎng)絡的優(yōu)點之一就是支持GPRS終端設備長久在線，因此典型的GPRS DTU 在設計上都支持長久在線功能，這就要求DTU包含了上電自動撥號、采用心跳包保持長久在線（當長時間沒有數(shù)據(jù)通信時，移動網(wǎng)關將斷開DTU與中心的連接，心跳包就是DTU與數(shù)據(jù)中心在連接被斷開之前發(fā)送一個小數(shù)據(jù)包，以保持連接不被斷開）、支持斷線自動重連、自動重撥號等特點。支持參數(shù)配置，長久保存 GPRS DTU作為一種通信設備，其應用場合十分廣（guang）泛。在不同的應用中，數(shù)據(jù)中心的IP地址及端口號，串口的波特率等都是不同的。因此，GPRS DTU都應支持參數(shù)配置，并且將配置好的參數(shù)保存內(nèi)部的長久存儲器件內(nèi)（一般為FLASH或EEPROM 等）。一旦上電，就自動按照設置好的參數(shù)進行工作。 GPRS DTU的擴展功能：較為專業(yè)的GPRS DTU還提供一些擴展功能，主要包括：支持數(shù)據(jù)中心域名解析 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" 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