According to the characters of a computer system , three typical estimate parameters , including computer unit , service , and user request , were chosen and their measurement standards explained respectively 根据计算机系统的特点总结出计算机单元、服务、用户请求等三个典型估算参量,说明了各自的度量标准,并对为简化计算机模型而进行的约定进行了简要描述。
The design of hardware is based on fpga ( filled programmable gate array ) and mcu ( micro computer unit ) , providing small volume , reliability and simply control . the design of software is based on keil c51 and foundation 3 . 1 . it can realize many complex functions , so the flexibility of application is greatly strengthened 数据采集卡的硬件设计基于现场可编程门阵列( fpga )和单片机( mcu ) ,体积小、工作可靠、控制简单、外围电路少;软件设计采用keilc51和foundation3 . 1 ,可根据用户需要实现多种复杂的功能,极大的提高了应用的灵活性。
Computer units including pc and single chip connected through serial interface were applied widely in industry control , condition measure . these systems almost communicate through rs232 , rs485 or modem . these manners limit deeply situation of the units " application though these economy and practicality 单片机和pc机通过串行接口构成的多微机系统已经广泛应用于工业控制、环境监测等场合,这些系统大多采用rs232 、 rs485或是有线modem的通信方式,虽然很经济实用,但是有线数据传输方式很大程度上限制了其使用的场合。