DSQC639 3HACO25097-001/13 通讯卡件

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1.1核算机的软硬件概念

核算机系统由**“硬件”和“软件”两部分组成**。

硬件是指看得见摸得着的各种电子元器件。如主机、键盘、鼠标等。

软件看不见摸不着，但在逻辑上，咱们确实能够感知到它的存在，它由人们事前编制的具有某种功能的程序组成。比方操作系统、编程言语等。核算机的软件通常又分为:系统软件和运用软件。

系统软件;又称为系统程序，首要用来办理整个核算机系统，监督服务，使系统资源得到合理调度。它包含:操作系统、言语处理程序、数据库办理系统、网络软件、服务程序等。

运用软件:又称为运用程序，它是用户根据需要事前编制的程序。比方QQ、微信等。1.2核算机的分类

核算机的品种许多，从不同的视点看，有不同的分类。

.依照核算机的处理信息的方法，能够分为数字核算机和模拟核算机。

数字核算机:经过信号的两种不同状态(1和0）来表明信息，能够方便地对数字信号进行算术和逻辑运算，具有速度快、精度高、便于存储等长处。通常讲的核算机一般是指数亨核算机。

模拟核算机:一般只能处理模拟信号，如接连改变地电压、电流和温度等。这类核算机运用邻域有限，通用性不强。.依照核算机通用性地差异，核算机能够分为专用核算机和通用核算机。

专用核算机:专门为某一问题而设计的核算机。功能比较单一，对运用环地步适应性很差。例如核算导3弹弹道的专用核算机。

通用核算机:各行业和各种环境都能运用的核算机，一般具有较高的运算速度、较大的内存容量。咱们平常运用的个人台式核算机都归于通用核算机。

.依照核算机系统的规模和处理才能，通用核算机能够分为以下几类;微型机

小型机大型机超级核算机

核算机的诞生与开展

2.1冯·诺依曼系统

1945年，被称为“核算机之父”的美籍匈牙利科学家冯·诺依曼在研究EDVAC时提出了“存储程序”的概念。以此概念为根底的各类核算机称为冯·诺依曼机。它的特色能够归纳如下:

核算机的结构应由五大部分组成:运算器、控制器、存储器、输入设备、输出设备。指令和数据以同等地位寄存在存储器内，并可按地址寻访。

指令和数据均用二进制数表明。

指令由操作码和地址码组成，操作码用来表明操作码的性质，地址码用来表明操作数在存储器中的方位。指令在存储器内按次序寄存。

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Analog quantity The analog quantity of the input and output module is an arbitrary value that represents continuous changes within a certain range, and is the opposite of the state representation of the digital quantity. Analog quantities are often used to capture and represent parameters such as voltage, current, or frequency of things. Drive hardware output and related data channels, select the current set value according to the operation mode, or reverse it as needed, and provide the result to the hardware output or software output. This is the modular input module. The analog input module is an intelligent module that can collect analog values such as voltage, current, thermocouple, thermal resistance, and temperature, and transmit them to the computer through the 485 bus. The main function of the analog output module is actually to convert the input digital signal into digital mode, and output adjustable continuous voltage, current and signal.

For example, the control of various analog quantities in the TV control block, if the sound is taken as an example, the first remote control or key scan pulse digital signal input into the control block, after the analog output module digital-to-analog conversion, the output can change with the input signal continuous voltage signal, and then use the signal to control the sound channel, so as to control the volume, brightness and contrast. In addition, analog output modules are not only used in these places, but are now widely used in various kinds of intelligence.

For example, the analog input module is good or bad, can give a standard signal to see whether the collected value is correct, and the analog output module outputs a value. If the measurement range is consistent, it can be measured by input and output. The analog module has input and output, and the switching module also has input and output. Such modules can save space. Because if it is not integrated in this way, if you need input and output, you need to order at least two modules, if you arrange it in this way, only one module is needed. Integrated input/output modules mean that there are both input and output signals on the same module.

The functions of analog input/output modules used in other fields also include various collection functions, control functions, display functions, remote management functions, alarm functions and storage functions. The acquisition function is the standard signal of the transmitter such as pressure, temperature and displacement. Collect flow data of flowmeter and pulse meter; Collect the running status of the water pump or valve, the power supply status of the device, and the opening and closing status of the door. The control function is to support automatic control, remote control of pumps, valves and other control equipment. Display function for digital tube display, optional LCD display, external display. Remote management function supports remote parameter setting and program upgrade through GPRS transmission device. If the monitoring data of the alarm function exceeds the limit value, report the alarm information immediately. Storage function: local cyclic storage of monitoring data, power will not be lost.

 

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