In china , the data structure of the accounting software in use is various , so is the development platform . since there is not the standard of data interface , these pieces of accounting software hardly have the module of data transformation . which bring a common problem to the study and development of the auditing software . which is how data are gained from the auditing software . that is . how the accounting software is combined with the auditing software 在我国，正在使用的会计软件数据结构五花八门，开发平台多种多样；由于以前没有数据接口标准，这些会计软件几乎都没有数据转换模块。这就给审计软件的研制开发带来了一个共同的问题：如何从会计软件中读取数据，也即如何实现审计软件和会计软件的一体化。
This article use pic singlechip " pic16f874 " as the sphygmomanometer ' s kernel , which is prevalent at present . pressure which blood oppress vein is translated to electric signal . through pic16f874 ' s a / d translation modul it is be transformed digital signal 本文以目前较为流行的pic单片机pic16f874为血压测量计的核心，利用motorola公司的压力传感器将血液对血管壁的压力转换为电信号，并送入单片机中集成的a d转换模块将血压信号转换为数字信号后进行显示、存储、传输等处理。
This project research mainly includes : consummate the design plan , hardware circuit design , software design , the match between control system and electromagnetic proportion , the anti - interference of control system , and etc . the hardware circuit design of singlechip control system mainly includes odd parts of enlarging circuit , a / d change circuit , d / a change circuit etc . adopt the module to design program in software design 课题研究内容主要是包括:控制系统设计方案、控制系统硬件设计、软件设计、系统抗干扰和电源电路设计。系统的硬件采用了模块结构设计,主要是包括采样模块、主控制模块、 a / d转换模块、 d / a转换模块、电液比例阀驱动模块和电机驱动模块等几个部分组成。
The thesis includes the design of hard circuit , pcb ( printed circuit board ) , driver and application soft involving a / d board and d / a board . the detailed functional modules consist of multiplex signals select module 、 analog digital conversion module 、 digital analog conversion module 、 pci protocol conversion module 、 driver and magnifying module 、 control logic 、 clock circuit and configuration circuit . the importance of the thesis is a / d board 本课题包括硬件电路、印刷电路板( pcb ) 、驱动程序和应用软件的设计，涉及a / d板和d / a板两大块部分，具体的功能模块包括多路信号选择模块、模数转换模块、数模转换模块、 pci协议转换模块、驱动放大模块、控制逻辑、时钟电路和配置电路，其中重点是a / d板部分。
