The Design And Realization Of Constant Temperature Incubator Shaker Controller Based On Modbus Protocol

Constant temperature incubator shaker is indispensable experiment equipment for scientific research, such as biology, pharmacy, foodstuff, iatrology, sanitation, environmental protection, agriculture, forestry, etc. It can provide an invariable environment during biology and chemistry experimention. With the development of bioscience, its requirement is increasing rapidly. Currently, most of the same products are used mechanical timing or controlled by 8-bit MCU at home which function is singleness, precision and data management is low. So it is necessary to develop the constant temperature incubator shaker that has high performance, multi-function and strong data management.In this paper, a controller of constant temperature incubator shaker is designed and implemented with double MCU architecture based on Modbus protocol. The double MCU architecture consists of a 32-bit MCU LPC2368 and an 8-bit MCU AT89C55. This characteristics are high performance, high reliability, strong data manage ability, better real time and easier operation.This thesis describes the design of constant temperature incubator shaker controller. Firstly, it shows the whole framework design of the controller. Secondly, the designs of hardware modules are given. Thirdly, according to the practical uses, it analyses the Modbus protocol and reducse its function code to satisfy system requirement, and realizes the dependable communication between two MCU of controller. It also analyses the I~2C bus protocol, realizes the MCU read or write data to serial EEPROM memory by I~2C bus. The flowcharts of software modules are given. Then, the debug method of system is discussed. Analysing the problems in debug, the resolvents are given. At last, the summarization and expectation of this project are discussed. The results of this research provide a reference for the development of other high performance industrial controller.It is proved by manufacturer severe tests and actual run that the constant temperature incubator shaker controller runs consistently dependable, with the better real time performance and the stronger antijamming ability.