基于DTMF電路HT9200A及MODEM芯片MSM7512B的數(shù)據(jù)傳輸裝置

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摘要
隨著科學(xué)技術(shù)的發(fā)展，人們對(duì)各種單片機(jī)控制系統(tǒng)的功能要求越來越高。例如水、電、煤氣表的自動(dòng)抄錄、IC卡電話機(jī)的話費(fèi)統(tǒng)計(jì)及稅控收款機(jī)等分布式系統(tǒng)中，人們希望能在中心機(jī)房通過公用電話網(wǎng)上進(jìn)行適當(dāng)?shù)木W(wǎng)絡(luò)聯(lián)接通過數(shù)據(jù)的傳輸實(shí)現(xiàn)對(duì)各測控點(diǎn)的監(jiān)控。此外，通過電話網(wǎng)對(duì)自動(dòng)化設(shè)備的遠(yuǎn)程調(diào)試、維修可以降低廠家的維修成本。借助在應(yīng)用中編程技術(shù)，甚至可以單片機(jī)系統(tǒng)實(shí)現(xiàn)遠(yuǎn)程在線升級(jí)。由于MCS-51單片機(jī)及其兼容機(jī)型仍在國內(nèi)單片機(jī)應(yīng)用中占有重要位置，本文將選取AT89C51單片機(jī)，設(shè)計(jì)了基于DTMF電路HT9200A及MODEM芯片MSM7512B的數(shù)據(jù)傳輸裝置。

關(guān)鍵詞：通信，調(diào)制，解調(diào)，遠(yuǎn)程數(shù)據(jù)傳輸

Along with the technical development of science, the people control the function request of the system to various machine more and more high.For example the water, electricity, the coal gas form makes copy automatically, the words fee of the IC card telephone statistics and the tax controls to accept the payment machine etc. is in the distribute type system, the people hope centrally the engine room connects the data to deliver the realization through the network that goes forward to go the adequacy with the telephone net to each supervision that measures to control to order.In addition, pass the telephone net to the automation equipments of long range adjust to try, maintain and can lower the factory house to maintain the cost.Ask for help to weave the distance technique in the application, even can carry out the on-line upgrade of long range with a machine system.Because a machine of MCS-51 and it and still permit the model to occupy the important position in a machine application, this text will select by examinations a machine of AT89C51, design according to the DTMF electric circuit HT9200A and the MODEM chip MSM7512Bs of data deliver the device.
Keywords: communication; modulate; demodulate; long-distance data transmission

目錄
前言　……………………………………………………………………?。?br>第一章 硬件的設(shè)計(jì)
1． AT89C51 ………………………………………………………３
2． 74LS244 ………………………………………………………７
3． MSM7512B ………………………………………………………８
4． HT9200A ………………………………………………………１３
5． ULN2003 ………………………………………………………１７
6． LED 數(shù)碼管 …………………………………………………… １８
第二章 電路的設(shè)計(jì)
1． 鍵盤的設(shè)計(jì)…………………………………………………… １９
2． 顯示的設(shè)計(jì)…………………………………………………… ２３
第三章 數(shù)據(jù)傳輸與軟件
1． M7512B在數(shù)據(jù)傳輸中的應(yīng)用……………………………………２７
2． MSM7512B與標(biāo)準(zhǔn)Modem建立連接 ……………………………３０
3． DTMF電路HT9200A與單片機(jī)的接口………………………… ３５
參考資料 ………………………………………………………………… ３７
附件：英文翻譯……………………………………………………………３８

參考資料：
1． 何立民.單片機(jī)應(yīng)用技術(shù)選編(8). 北京航空航天大學(xué)出版社.2000
2． 程化平。MSM7512B在數(shù)據(jù)遠(yuǎn)傳中的應(yīng)用。力源電子工程，1999（3）：24~25
3． MSM7512B數(shù)據(jù)手冊。武漢力源電子股份有限公司，1999