Study And Design Of Data Communication And The Host Of Telemetry And Command System Basing On GSM Network

The development of industry accelerates the progress and improvement of agriculture and some agricultural control systems face many hard problems such as the increasing coverage of monitored area and the scattered measured points.The paper will try to answer the questions that how to efficiently and economically realize the desired control function sufficiently.The paper demonstrates the advantages of wireless telemetry and command system, combines the technology of computer, mobile communication, electronic, telemetry and command and has realized the desired goal.At the first,the paper deeply studies the principle of GSM including the its working process and related technology, and focuses on the sending and receiving methods of SMS and the encoding and decoding methods of PDU and AT commands.Additionally it deeply studies another key technology named USB protocol including data transmission method and the hardware specification.The GSM and USB theories provide the theoretical foundation for the improvement of research, and assure the implement of the system.Then, According to the actual situation of measure and control of granary, the paper confirms the reasonable development process and the desired function.For software: It provides the program of excellent interface for users using VC++ MFC, develops WDM driver basing on Windows XP SP2 operating system using VC++6.0 and DDK, and utilizes KeilC to program the firmware . For hardware: The paper chooses cost-effective CY7C68013 to design fundamental system model. It chooses TC35i(Siemens Company) for GSM model.The paper designs the IGT circuit, indicating circuit, power circuit, interface circuit among chips and other parts.At the last, the paper adopts a new convenient practicable and reliable manner, which utilizes USB as interface of computer and terminal machine.It relies on the mobile communication network, and uses SMS as the information transmission carrier.The study changes the inconvenience of the serial bus connection of conventional remote measure and control system and the net topology of wired and wireless communication network. It extends the scope of monitored area and saves the cost.The system is fit for multi-monitored points and remote distance telemetry and command control.It indicates the program is practical and reasonable after being debugged and analyzed. At the end of the paper, it indicates the aspects needed to be improved and shows the direction to be studied continuously in future.