The Development Of PC104 Embedded Measuring And Controlling System On Chromatograph

CX8800 chromatograph developed by Nanjing Nanfen Analyzer Limited Company is a key scientific and technological brainstorm project of Nanjing Science and Technology Commission. In the background of engineering implement, this dissertation introduces the development and the research of PC104 measuring and controlling system on CX8800 chromatograph. It is important for the system to reasonably solve the contradiction between real time running of multitask and advancing run-pace of the system, so both advancing run-pace of hardware and software and saving memory resource are major difficulty. The operating system is DOS, which make software design more difficult.Three parts, which are hardware design, sampling and accessing quickly data of chromatogram peak, software design, are introduced in this dissertation. Hardware system is made of CPU, A/D, D/A, display driver and clock. Software design includes many aspects, such as design of interface, interrupt and clock control, monitoring, etc. Sampling and accessing quickly data of chromatogram peak is an important tache to ensure analytic and real time performance of chromatograph, FIFO make high-speed input and output of A/D sampling data possible, and expended memory, instead of disk, save a great deal of peak data and process parameter. Special Chinese characters base designed is used to double-quick Chinese of English interface. Interruption and clock control process analysis of chromatograph periodically, current process status is monitored continually and alarmed. This paper introduces in detail from selection of hardware chips to design of software system.