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src="http://tyunfile.71360.com/UpLoadFile/2019/8/20/11/637018974538984691_nhsdo_5544629.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="3fhuby9" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/2019/8/20/11/637018974538984691_nhsdo_5544629.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="fj8ojbq" 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(guān)鍵詞：</span>肅寧4G-DTU外殼</p><p><span>***更新：</span>2020-06-21 09:17:31</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="afxeg8h" 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(jī)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(jī): </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(dāng)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="pjg3ac9" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="2gyaxj9" class="box"><p><p style="text-indent:25px">支撐主動心跳，堅持長久在線 GPRS通訊網(wǎng)絡(luò)的利益之一就是支撐GPRS終端設(shè)備長久在線，因而典型的GPRS DTU在規(guī)劃上都支撐長久在線功用，這就要求DTU包含了上電主動撥號、選用心跳包堅持長久在線(當(dāng)長期沒有數(shù)據(jù)通訊時，移動網(wǎng)關(guān)將斷開DTU與中心的聯(lián)接，心跳包就是DTU與數(shù)據(jù)中心在聯(lián)接被斷開之前發(fā)送一個小數(shù)據(jù)包，以堅持聯(lián)接不被斷開)、支撐斷線主動重連、主動重?fù)芴柕忍厣?4)支撐參數(shù)裝備，長久保存 GPRS DTU作為一種通訊設(shè)備，肅寧4G-DTU外殼，其運用場合非常廣（guang）泛，肅寧4G-DTU外殼。在不同的運用中，肅寧4G-DTU外殼，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。因而，GPRS DTU都應(yīng)支撐參數(shù)裝備，并且將裝備好的參數(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，就主動按照設(shè)置好的參數(shù)進(jìn)行作業(yè)。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="肅寧4G-DTU外殼" src="http://tyunfile.71360.com/UpLoadFile/2019/8/20/11/637018974538984691_nhsdo_5544629.jpg"></div><p style="text-indent:25px">CPU:工業(yè)級高性能ARM9嵌入式處理器，帶內(nèi)存辦理MMU,200MPS, 16KB Dcache,16KB Icache FLASH:8MB，可擴(kuò)充到32MB SDRAM:64MB，可擴(kuò)充到256MB 接口: UART: CM 3160P: 1個RS232串口串口速率: 110bps ~ 230400bps 數(shù)據(jù)位支撐: 8位或 7位奇偶校驗位: 無或奇數(shù)校驗或偶數(shù)校驗停止位: 1位或 2位流控: 無或 RTS/CTS CM 3160EP: 1個RS485接口(根據(jù)需求，可硬件跳線支撐RS232/422/TTL) 串口速率: 110bps ~ 230400bps 數(shù)據(jù)位支撐: 8位或 7位奇偶校驗位: 無或奇數(shù)校驗或偶數(shù)校驗停止位: 1位或 2位流控: 無或 RTS/CTS </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="肅寧4G-DTU外殼" src="http://tyunfile.71360.com/UpLoadFile/2019/8/20/11/637018974541328336_nhsdo_5043193.jpg"></div><p style="text-indent:25px">GPRS DTU主動主張與數(shù)據(jù)中心的通訊銜接，并堅持通訊銜接一直存在。由于GPRS DTU處于移動內(nèi)網(wǎng)，并且IP地址不固定。因而，只能由GPRS DTU主動銜接數(shù)據(jù)中心，而不能由數(shù)據(jù)中心主動銜接GPRS DTU。這就要求數(shù)據(jù)中心具有固定的公網(wǎng)IP地址或固定的域名。數(shù)據(jù)中心的公網(wǎng)IP地址或固定的域名作為參數(shù)存儲在GPRS DTU內(nèi)，以便GPRS DTU一旦上電撥號成功，就能夠主動銜接到數(shù)據(jù)中心。詳細(xì)地講，GPRS DTU經(jīng)過數(shù)據(jù)中心的IP地址(假如是選用中心域名的話，先經(jīng)過中心域名解析出中心IP地址)以及端口號等參數(shù)，向數(shù)據(jù)中心主張TCP或UDP通訊懇求。在得到中心的響應(yīng)后，GPRS DTU即認(rèn)為與中心握手成功，然后就堅持這個通訊銜接一直存在，假如通訊銜接中止，GPRS DTU將當(dāng)即從頭與中心握手。由于TCP/UDP通訊銜接現(xiàn)已樹立，就能夠進(jìn)行數(shù)據(jù)雙向通訊了。 </p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/335841.html</p></div></div></div></div></div><div id="nw7nnpz" class="page-right twoColRt"><div id="bqiaxet" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="rli7ipj" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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