Study And Realization Of A Telemetry And Command System Extension Based On Mobile Communication Network And Its Interface

Along with the rapid popularization and furious competition of the GSM network, study and application of new technology and new operation have been advanced to a quite important position. SMS which is a basic service of GSM network has been adverted by more and more system operator and developer, and many kinds of applications based on this service have been rapid developed.This paper takes the temperature for example to design a telemetry and command system extension based on the short message service. The aim of design is to complete functions such as temperature collection, data transmission or receiving and response to the command of the master computer.In the extension GSM network is a medium for transmitting the remote signal The mode used to transmit information is the TEXT mode of the short message service. Transmitting and receiving SMS is realized by using AT command.The hardware design divides into two main parts-temperature collection and the data transmission or receiving. In the part of temperature collection the 1-wire bus temperature sensor called DS18B20 and the MCU called SPCE061A are used to complete the function. Many temperature sensors connect together in parallel mode to constitute a network which used to collect the temperature in different locations.SPCE061A is used to store these temperature; The data transmission or receiving part is made up of by a MCU and a GSM mode called TC35i.The GSM mode is used to receive or transmit the short message while the MCU is used to code or decode the short message and complete operations accord with the short message received.C-language and assemble language are both used during the software design and functions are completed for example the DS18B20 initialization, temperature collection the information receiving and transmission etc.The result proves the telemetry and command system based on the mobile communication short message service improved the data transformation's reliability. Compared with the other wireless telemetry and command systems, the costs of making up and upholding the network is reduced.