本文關(guān)鍵詞：GPIB-RS232控制器設(shè)計(jì)與實(shí)現(xiàn)　出處：《武漢理工大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： GPIB總線 GPIB協(xié)議 NAT9914 SCPI

【摘要】：目前，國(guó)內(nèi)的儀器大多帶有RS232接口，這就使得只有一臺(tái)儀器能與計(jì)算機(jī)相連，不利于將多臺(tái)儀器通過(guò)GPIB總線進(jìn)行擴(kuò)展連接。針對(duì)這一問(wèn)題，通常是在現(xiàn)有儀器的基礎(chǔ)上，進(jìn)行硬件添加或者軟件輔助來(lái)實(shí)現(xiàn)GPIB協(xié)議轉(zhuǎn)換�；诖耍疚牟捎每删幊虒Ｓ媒涌谛酒⑴浜宪浖刂瞥绦�，設(shè)計(jì)并實(shí)現(xiàn)了GPIB-RS232控制器。 首先，在硬件上，GPIB-RS232控制器主要分為三個(gè)部分：控制電路、RS232接口端以及最重要的GPIB接口端。為確保目標(biāo)板線路連接可靠，在確認(rèn)STM32F單片機(jī)最小系統(tǒng)正常工作的前提下，還需要注意NAT9914芯片的數(shù)據(jù)線、中斷線以及DMA功能線的連接，以方便后續(xù)軟件設(shè)計(jì)中對(duì)接口專用芯片內(nèi)部寄存器的操作以及接口功能的開(kāi)發(fā)。 其次，在軟件上，，也是主要分為三個(gè)部分：RS232接口通信、GPIB總線協(xié)議實(shí)現(xiàn)以及SCPI指令封裝、解析，其中后面兩者是本文設(shè)計(jì)的重難點(diǎn)。 第一，在GPIB總線協(xié)議實(shí)現(xiàn)部分，本文在傳統(tǒng)查詢法的基礎(chǔ)上進(jìn)行改進(jìn)創(chuàng)新，在完成NAT9914初始化之后，采用中斷方式來(lái)實(shí)現(xiàn)GPIB六種接口功能，即，T/SH功能、L/AH功能、SR功能、PP功能，從而完成GPIB系統(tǒng)中主從機(jī)之間的基本收發(fā)操作、服務(wù)請(qǐng)求與響應(yīng)。 第二，在SCPI指令封裝、解析部分，本文結(jié)合具體儀器功能，建立SCPI通用指令和部分特定控制指令的指令二叉樹(shù)，并采用鏈?zhǔn)浇Y(jié)構(gòu)存儲(chǔ)；然后，采用自頂向下的方式來(lái)遍歷指令樹(shù)，完成對(duì)接收到的程控消息的匹配查詢。 最后，為了檢測(cè)開(kāi)發(fā)的接口功能和SCPI指令解析是否可行，本文結(jié)合公司的數(shù)字光衰DOA，組建一個(gè)簡(jiǎn)單的測(cè)試系統(tǒng)，并采用兩種方式進(jìn)行測(cè)試：①基于Agilent Connection Expert軟件環(huán)境，在其IO交互界面發(fā)送SCPI指令，完成對(duì)儀器的操控；②在Visual Studio2010軟件平臺(tái)下調(diào)用VISA函數(shù)編寫(xiě)C語(yǔ)言測(cè)試程序，來(lái)控制儀器工作。 上述測(cè)試方法得到的結(jié)果表明，本文設(shè)計(jì)的GPIB-RS232控制器能可靠穩(wěn)定地完成數(shù)據(jù)傳輸、及時(shí)響應(yīng)設(shè)備服務(wù)要求，并且通過(guò)SCPI指令解析后，儀器能按照指令要求完成相應(yīng)操作。
[Abstract]:At present , most domestic instruments have RS232 interface , which makes only one instrument can be connected to the computer , which is not beneficial to the extension connection of multiple instruments through the interface . In order to ensure the reliable connection of the target board , we also need to pay attention to the connection between the data line , the interrupt wire and the DMA function line of NAT9914 chip , so as to facilitate the operation of the internal register of the interface special chip and the development of the interface function in the subsequent software design . Secondly , on the software , it is mainly divided into three parts : RS232 interface communication , bus protocol implementation and SCPI instruction encapsulation , analysis , the latter two are the key difficulties in this paper . First , on the basis of the traditional inquiry method , this paper carries out the improvement and innovation on the basis of the traditional inquiry method . After the initialization of NAT9914 , the functions of the six kinds of interface functions , i.e . , the T / SH function , the L / AH function , the SR function and the PP function , are realized by the interrupt mode , so that the basic transmitting - receiving operation , the service request and the response between the master and slave machines in the gI system are completed . secondly , an instruction binary tree of SCPI general instruction and part of a specific control instruction is established in the SCPI instruction package and the analysis part , and a chain type structure storage is adopted ; and then , a self - top down mode is adopted to traverse the instruction tree to finish matching query on the received program control message . Finally , in order to detect whether the interface function and SCPI instruction parse are feasible , this paper combines the digital light attenuation DOA of the company to form a simple test system , and the test is carried out in two ways : ( 1 ) based on the Agilent Connection Expert software environment , sending the SCPI instruction in the IO interactive interface , completing the manipulation of the instrument ; and 2 ) calling the Visa function under the Visual Studio 2010 software platform to write the C language test program to control the operation of the instrument . The results of the above test method show that the interface designed by this paper can reliably and stably complete the data transmission , respond to the equipment service requirement in time , and the instrument can complete the corresponding operation according to the instruction requirement after the SCPI instruction is resolved .

【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TP332

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本文編號(hào)：1410970