Computer-controlled Receiving And Sending Of Short Messages

Short Message Service is a worldwide accepted service, it can transmit short message in word or in figures between user and system. It is a convenient and cheap communion, which has a lot of virtues that other communication services do not have. Now, as a basic service of GSM, SMS attracts more and more attention .A lot of applications can be developed if we use GSM as a data wireless covert network .All these development researches will have broad market in every walk of life.A short message application example is designed. Firstly, a radio frequency identification system is developed. The data on the IC cards can be recognized accurately by the reader based on RF identification technology and received by short message terminal, and then short message can be sent automatically through com port. The short message terminal also can receive short message, send short message to different people at one time, and send short message through ASP. The administrator can manage, query various data; print, save the outcome; create report forms and so on. The user can send E-mail, vote via network etc.At first, a brief introduce about Global system for Mobile communications (GSM) and General Packet Radio Service (GPRS) has been given. Then SMS gateway, signaling flow, and Enhanced Message Service(EMS), Multimedia Messaging Service(MMS) are described. After China Mobile Peer to Peer protocol (CMPP) is discussed, particular analysis is given concerning AT command of Siemens company and the composing, meaning of PDU.Finally, the design of circuit and programming on the control of monolithic computer are discussed in detail. The flow chart of sending and receiving short message, and how to apply Windows API to read and write data through com port in visual basic.net is depicted. The message in PDU mode and its encoding and decoding in Chinese or in English are presented.