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1、太原理工大学硕士学位论文基于GPRS和ARM7的网络化皮带秤仪表设计姓名：王晓栋申请学位级别：硕士专业：控制理论与控制工程指导教师：李丽宏20090401太原理工大学硕士研究生学位论文 I基于 GPRS 和 ARM7 的网络化皮带秤仪表设计 摘 要 随着电子技术、传感器技术和网络化信息技术的发展，称重技术也得到了迅速的发展，称重设备在智能化，数字化，通讯方式方面也有了很大进步，称重装置的研究与开发也进入了一个新的发展阶段。 本文介绍了国内外电子皮带秤的发展现状及通讯联网方式，分析了皮带秤的组成及称重原理，同时也研究了 GPRS 在工业当中的应用情况，提出了一种新的皮带秤通讯方式的设计方案。即把
2、 GPRS 技术应用到皮带秤中，实现了皮带秤设备的远程管理。 本设计的核心主要包含两部分的内容： 1.硬件电路的设计；2.称重系统和 GPRS 无线通讯的软件编程。 硬件电路部分设计采用了两个 CPU 实现控制，C8051F021 单片机和LPC2214 ARM7 处理器。C8051F021 单片机主要实现重量信号采集、速度信号采集、外部看门狗及 RTC、020mA 电流输出、键盘及显示等功能，该单片机比传统的 51 单片机速度更快， 性能更强。 LPC2214 主要控制 GPRS 模块 MC55，实现与上位机监控中心的通讯功能，两个 CPU 之间通过串口通讯。本设计中选用了高精度 ADC 采
3、集芯片 CS5532 提高了仪表的精度；数据显示采用液晶显示模块，人机界面友好；外部看门狗能够实现低电压监测，提供 RTC 时钟，同时该芯片内部还有 256k 的 FLASH 用来存储仪表的参数，该设计增强了仪表的抗干扰能力、稳定性。 太原理工大学硕士研究生学位论文 II软件部分编制了重量信号采集程序、仪表的调零和标定、串口通讯、GPRS通讯程序等；研究学习了 C/OS-II 操作系统的原理，把该操作系统移植应用到了 GPRS 控制当中； 在 GPRS 通讯中增加了 CRC 校验提高了传输数据的准确性。 完成设计之后对仪表进行了抗干扰、温度等各种测试，同时也进行了多台仪表与监控中心的联机调试，
4、经过测试 GPRS 通讯链路稳定，误码率极低。该设计在提高仪表的精度和速度的同时也拓展了仪表的通讯功能。 关键词：称重原理，皮带秤仪表，GPRS，ARM7，C/OS-II，C8051F021 太原理工大学硕士研究生学位论文 IIIDESIGN OF BELT WEIGHING DEVICES BASED ON GPRS AND ARM7 ABSTRACT Along with the electronic technology, the sensor technology and the network information technologys development, the weig
5、hing technology also obtained the rapid development, weighing equipment at intelligent, digitization, communication is also a great progress, the weighing installments research and the development also entered a new stage of development. This paper introduces the development of domestic and foreign
6、electronic belt scale and various means of communication, an analysis of the composition and belt weigher weighing principle, simultaneously has also studied GPRS in the middle of the industry application situation, proposed one kind of new belt weight meter communication way design proposal. Namely
7、 applies the GPRS technology in the belt weight meter, has realized the belt weight meter equipments long-distance management. This designs core mainly contains two parts of contents: 1. Hardware Circuit Design 2.Weighing System and GPRS wireless communication software programming. The hardware circ
8、uit design uses two CPU control implementation, C8051F021 MCU and LPC2214 ARM7 processor. C8051F021 MCU mainly realizes weight 太原理工大学硕士研究生学位论文 IVsignal gathering, rate signal gathering, the exterior watch-dog and RTC, 020mA electric current output, keyboard and display functions and so on. This MCU
9、is quicker than the traditional 51 MCU speed, the performance is stronger. LPC2214 primary control GPRS module MC55, realizes with the superior machine monitoring center communication function, between two CPU adopts the serial port communication. In this design selected high accuracy ADC gathering
10、chip CS5532 to increase measuring appliances precision. The data demonstrated that uses the liquid crystal display module, the man-machine contact surface is friendly. External watchdog can achieve low-voltage monitoring, the provision of RTC clock, at the same time within the chip have 256k of FLAS
11、H used to store instrument parameters, the design of the instrument to enhance anti-interference ability and stability. The software part has established the weight signal gathering procedure, measuring appliances zero alignment and the calibration, the serial port communication, the GPRS communicat
12、ion procedure and so on. Research study of the C/OS-II operating system principles, the application of the operating system migration to the GPRS control of some of them, increased the CRC verification in the GPRS communication to enhance the transmission data accuracy. After the completion of the d
13、esign of instrumentation to carry out various tests such as the anti-jamming, simultaneously has also carried on many measuring appliances and the monitoring center debugging on-line, the process tests the GPRS communication link to be stable, the error rate is extremely low. This design while 太原理工大
14、学硕士研究生学位论文 Vincreased measuring appliances precision and speed has also developed measuring appliances communication function. KEY WORDS: Weighing principle, Belt weigher Instrumentation, GPRS，ARM7，C/OS-II，C8051F021 太原理工大学硕士研究生学位论文 X图目录 图 2-1 GPRS 无线网络数据信号传输系统结构示意图. 5 图 2-2 皮带秤系统组成. 6 图 2-3 皮带秤称重原理图. 7 图 2-4 传感器承受的总重量. 8 图 2-5 皮带秤仪表设计结构图. 9 图 2-6 皮带秤联网示意图. 10 图 3-1 C8051F021 最小系统原理图 . 13 图 3-2 JTAG 电路原理图.
