【摘要】：熱表數(shù)據(jù)傳輸系統(tǒng)是在現(xiàn)有熱量表的基礎(chǔ)上利用M-BUS總線技術(shù)實(shí)現(xiàn)數(shù)據(jù)的傳輸。本系統(tǒng)主要由兩部分組成,一個(gè)是M-BUS主站,另一個(gè)是M-BUS從站。M-BUS從站一方面可以通過(guò)隔離的485模塊從熱量表中得到數(shù)據(jù),另一方面可以通過(guò)24位AD轉(zhuǎn)換器采集2路溫度信號(hào)和2路4-20mA信號(hào)。M-BUS主站通過(guò)M-BUS,總線得到M-BUS從站的數(shù)據(jù),然后可以通過(guò)GRRS或者串口將數(shù)據(jù)送到管理中心處理與顯示。本設(shè)計(jì)使用的NuMicro M0516 32位ARM處理器,不僅成本低,而且數(shù)據(jù)處理能力強(qiáng)。整個(gè)系統(tǒng)可以分為兩個(gè)部分：一部分利用Modbus協(xié)議采集熱量表數(shù)據(jù),并通過(guò)M-BUS技術(shù)以及GPRS網(wǎng)絡(luò)遠(yuǎn)程傳輸?shù)焦芾碇行模涣硪徊糠质峭ㄟ^(guò)ADS1234采集芯片采集四路溫度和電流信號(hào),使用定時(shí)器每500ms定時(shí)中斷完成AD采集通道的切換,即每2s完成對(duì)四個(gè)通道的一次循環(huán)采集并通過(guò)M-BUS技術(shù)以及GPRS網(wǎng)絡(luò)遠(yuǎn)程傳輸?shù)焦芾碇行膶?shí)時(shí)顯示。其中,溫度信號(hào)利用PT1000鉑熱電阻,通過(guò)調(diào)節(jié)電阻箱的阻值來(lái)改變輸入的溫度值,并使用分段線性化的方法對(duì)測(cè)量結(jié)果進(jìn)行零點(diǎn)和增益修正；4-20mA電流信號(hào),則通過(guò)一個(gè)精密電阻直接將其轉(zhuǎn)換成電壓由AD采集得到。本系統(tǒng)在M-BUS通訊及485通訊的硬件電路上均帶有隔離設(shè)計(jì),不僅增加了儀表的抗干擾能力,還達(dá)到了輸出隔離的目的。此外,本文還設(shè)計(jì)了存儲(chǔ)模塊與時(shí)鐘模塊。實(shí)驗(yàn)證明,本設(shè)計(jì)中PT1000熱電阻的測(cè)溫精度達(dá)到了0.189%,電流測(cè)量精度達(dá)到了0.13%,達(dá)到了設(shè)計(jì)要求,說(shuō)明本設(shè)計(jì)方案是切實(shí)可行的。
[Abstract]:The heat meter data transmission system is based on the existing heat meter using M-BUS bus technology to achieve data transmission. The system is mainly composed of two parts, one is the M-BUS master station, the other is the M-BUS slave station. On the one hand, the M-BUS slave station can get the data from the heat meter through the isolated 485-module. On the other hand, two channels of temperature signals and two channels of 4-20mA signals can be collected by 24-bit AD converter. The M-BUS master station obtains the data of M-BUS slave station by M-BUS. Data can then be sent to the management center through GRRS or serial port for processing and display. The NuMicro M 0516 32 bit ARM processor used in this design is not only low cost, but also strong data processing ability. The whole system can be divided into two parts: one part uses Modbus protocol to collect heat meter data, and transmits to the management center through M-BUS technology and GPRS network; The other part is to collect four channels of temperature and current signals by ADS1234 acquisition chip, and complete the switch of AD acquisition channel with timer per 500ms timing interrupt. In other words, every 2 s, the four channels are collected once and transmitted to the management center through M-BUS technology and GPRS network in real time. The temperature signal uses the PT1000 platinum thermal resistance to change the input temperature value by adjusting the resistance value of the resistance box, and uses the piecewise linearization method to correct the zero and gain of the measurement results. The 4-20mA current signal is converted directly into voltage by a precise resistor and acquired by AD. The system has isolation design on the hardware circuit of M-BUS communication and 485 communication, which not only increases the anti-interference ability of the instrument, but also achieves the purpose of output isolation. In addition, the storage module and clock module are designed. The experimental results show that the temperature measurement accuracy of the PT1000 thermal resistance is 0.189 and the current measurement accuracy is 0.13, which shows that the design scheme is feasible.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU833.1

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本文編號(hào)：2301133