Study Design Based On The Can Bus Intelligent Pressure Transmitter

With the amazing development of communication, network and automation technology, the disadvantage of the traditional instrument in reliability and interchange ability is more and more obvious and thus it couldn't meet the users'requirements. The new generation of field bus instrument should not only have the fundamental measurement capability, but also possess the field bus communication function and control function. The development of field bus technology has changed the structure of traditional control system and combined with control network to bring forward an integrated full-distributed system,namely the field bus control system.In order to meet with the requirements of field bus instruments, an intellectual pressure transmitter based on CAN field bus technology has been developed. It has exploited the TI products: MSP430 series microcontroller and PC10 series pressure sensor with CAN interface. The thesis includes the following parts: The first part is about CAN field bus, including its feature, technical specification, protocol, device and application. The second part is about the hardware design, including the microcontroller module, the sensor module, the LCD module, the communication module, the power module and the anti-interference measures. The third part is about the software design, including the initialization module, data acquisition, data processing, LCD communication, control, communication and system testing. The fourth part is about the instrument measuring, communication function debugging and data analyzing. It comes to the conclusion that the instrument conforms to the requirements of field bus intellectual applications.The research indicates that the FCS technology achieves the information exchange among remote node in a new way which adds the function of bilateral digital communication. The rating of pressure measurement precision of the transmitter is 0.25 and the sensor is characteristic of high linearity. The field bus has solved the anti-interference problem of the transmitter through adopting the digital signals transmission and has improved the reliability, autonomy and agility of the system for combining the low wastage and the technologic requirements of the MSP430 SCM which achieving the effect of intellectual transmitter.