【導(dǎo)讀】隨著計算機(jī)技術(shù)、電磁兼容技術(shù)、傳感器技術(shù)和信息技術(shù)的飛速發(fā)展和普及，數(shù)據(jù)采集與處理系統(tǒng)得到了廣泛的應(yīng)用。瞬間物理過程的有力工具，也是獲得科學(xué)奧秘的重要手段之一。總之，數(shù)據(jù)采集是工、農(nóng)業(yè)控制系統(tǒng)中至關(guān)重要的一環(huán)[1]。同時，還要對某一檢測點任意參數(shù)能夠進(jìn)行隨機(jī)查尋，將其在某一時間段。內(nèi)檢測得到的數(shù)據(jù)經(jīng)過轉(zhuǎn)換提取出來，以便進(jìn)行比較，做出決策，調(diào)整控制方案，提高產(chǎn)品的合格率，產(chǎn)生良好的經(jīng)濟(jì)效益。系統(tǒng)以89C51為控制單元核心，利用模。信號的采集、存儲、顯示及與PC機(jī)通信等功能，形成了良好的人機(jī)界面。這一趨勢，作這方面的研究就顯得十分重要。在科學(xué)研究中，運用數(shù)據(jù)采集系統(tǒng)。此外，計算機(jī)的發(fā)展對通信起了巨大的推動作用。輸出及顯示這五個部分組成。由于RS-232在微機(jī)通信接口中廣泛采用，技術(shù)已相當(dāng)成熟。設(shè)計了一種以AT89C51和ADC0809及RS232為核心的多路數(shù)據(jù)采集系統(tǒng)。綜上所述，本設(shè)計中采用方案一來實現(xiàn)其功能。

　　

【正文】 features. Figure 1 system block diagram of work 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計說明書（論文） 第 38 頁 共 50 頁 Throughout the course of testing, all the control operations have pleted the software automatically, without human intervention. 2 hardware design The system is mainly to use the puter onboard RS232 munication ports and digital measuring instrument of munication port connecting munications, reuse LPT parallel port on a 8way channel selector for access control. 8way channel of choice for an 8elected one of analog switches and related circuit, the control signals from the puter39。s parallel port to provide and meet shown in table 1. Table1 The relation between channel selection and port output Communications port output Binary code Channel selection select channel 0 000 1 1 001 2 2 010 3 3 011 4 4 100 5 5 101 6 6 110 7 7 111 8 8way channel selector industry can use the SCM, subject to additional controls, select RS232 serial port as data transmission, because the RS232 port is the puter and measuring instruments on the standard configuration, municate with each other without additional hardware , Easy to use. In addition, a serial municationonly a bit, with only a standard datavoltage potential, hence more difficult in data errors. In a parallel port to transfer data 8bit, data transmission speed, but the data vulnerable to interference. Transmission distance in a shorter amount of data transmission larger circumstances, may be parallel port (such as GPIB, LPT, etc.) to municate. In addition, since LPT parallel port may signal transmission, channel selection is suitable for the control port. System in the course of work, good access control modules and data acquisition 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計說明書（論文） 第 39 頁 共 50 頁 module synchronization is particularly important because different channels of data storage needs of the corresponding data buffer pool, which is controlled by software. 3 software design The whole system software design is the most important part. Software system from the bottom of the munication protocol can be divided into functional threetier module and user interface. Software design in the use of multithreaded Windows technology, the technology for data collection procedures can effectively accelerate the reaction time and increase the efficiency of implementation. The procedures used in a separate thread for data collection, so the guaranteed maximum energy collection of realtime。 using another thread at the same time data processing, such procedures to avoid a singlethreaded the same time only the implementation of a functional deficiencies. Especially when the amount of data collection, data processing task, using multithreaded technology will greatly improve the efficiency of the system as a whole. Data Acquisition Module Data acquisition modules to eight channels of data in a cycle of all the acquisition to the puter, and save the channel, and the corresponding data in the buffer. Its procedures diagram shown in Figure 2. 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計說明書（論文） 第 40 頁 共 50 頁 Fig 2 Flow diagram of data acquisition At the beginning of procedures, with the choice of control and store data buffer at the same time to switch to the same channel, 8way data collection cycle and mand judgement, in the end not received orders, has recycling collection to do. Multichannel data acquisition process the data vulnerable to interference, especially in the fastchannel switching, the data vulnerable to fluctuations, as shown in Figure 3. At this time if the data collection, will be collecting the wrong data, the need to add some software algorithms to prevent this from happening. If we develop the automated data tracking algorithm to automatically track each channel data to 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計說明書（論文） 第 41 頁 共 50 頁 determine whether the channel in a stable state, and only the stability of data acquisition, the volatility of other data. In addition, the software can also add some filtering algorithm (such as limiting filter, etc.) to filter out manmade interference or other factors caused by the mutation data. Limiting filter for （ 1） Figure 3 channel switching, the data volatility When the new collected data and the data before a difference to the absolute value of more than one set of values that the data is invalid, and the previous data from the current data. Data Analysis Module In the data analysis module can be added if the algorithm analysis, graphics display and print output, and other useful features, such as gyroscopes and stability in the standard deviation algorithm can function in the course of testing realtime calculation of zero stability, and through chart shows. Zero stability calculation formula as follows: （ 2） According to first(2) to prepare an algorithm function, and then call in the 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計說明書（論文） 第 42 頁 共 50 頁 analysis module. Analysis module diagram of the procedure shown in Figure 4. Figure 4 data analysis process flow chart Because the system uses multithreaded technology, in the cycle of operation and will not affect the acquisition module39。s operation. The module also in its algorithm in the function of any expansion, forming a algorithm to adapt to different procedures for data analysis. In addition, software design, a friendly user interface is necessary in the process of the functions from the package, through a unified interface to users, to reduce operating difficulties and enhance efficiency. 4 system test results Figure 5 to 8 in the analysis of data acquisition systems, at the same time two 江蘇技術(shù)師范學(xué)院畢業(yè)設(shè)計說明書（論文） 第 43 頁 共 50 頁 threeaxis gyro and a single axis gyroscope total of seven road test data of the situation. Its precise data collection, data analys