氧气监控器自动化测试平台通信技术的研究与设计

发布时间：2018-06-15 00:21

本文选题：氧气监控器自动化测试平台 + 有线通信系统　；参考：《合肥工业大学》2017年硕士论文

【摘要】：机载氧气监控器是调节和监控飞行员呼吸供给的机载设备,其运行状态关系着飞行员的生理安全。因此,在使用之前或者定期都需要对氧气监控器进行完备的功能与性能测试,保证其可靠性。针对某型机载氧气监控器所设计的自动化测试系统可对其各项功能与性能进行正确性和可靠性测试,且测试过程实现全自动化,并能够实时显示测试数据和生成测试报表。由于该型氧气监控器的测试与调试工作主要依赖于与此电子设备的串口通信,并且相应的自动化测试系统内部含有多个需要通信的传感器和仪表。为实现对该电子设备不仅能够进行较远距离的现场单机通信,且能够满足相应自动化测试系统中的多机组网通信。本文通过研究当下一些基于单信号线的总线接口技术,设计并改进了一套适合应用环境的新型单总线接口方案。该通信接口方案采用单信号线主从式结构,并设计了相应的主机接口电路和从机接口电路。其中,从机接口电路采用低功耗设计,属于无源接口,结构简单,成本低廉;主机接口电路采用收发双驱动双电压设计,其中发送电路采用功率MOS管驱动、三态输出,接收电路采用模数转换、分压接收,另外还设置了相应的保护电路。在对传输线建模后,再对整个通信网络进行电路仿真测试。实验结果表明,当传输介质选择在5号双绞线条件下,新型总线的通信距离可达2000m,传输速率可达38400bit/s,可驱动从机节点数多达450个。最后利用该通信接口设计了一个便携的通信校准模块,并应用到氧气监控器自动化测试平台当中。从而扩展了对此型氧气监控器的调试方法。硬件上对氧气监控器的通信设计采用本文所述接口;软件上基于MSP430单片机设计了相应的协议处理程序和校准调试程序;最后通过PL2303芯片实现了MSP430单片机串口到USB 口的转换。实现完成后,通过该模块,氧气监控器自动化测试平台能够对氧气监控器进行实时检测,并可以对其进行自动化的校准调试。
[Abstract]:The airborne oxygen monitor is an airborne equipment which regulates and monitors the airman's breathing supply, and its running state is related to the pilot's physiological safety. Therefore, it is necessary to test the function and performance of the oxygen monitor before or on a regular basis to ensure its reliability. The automatic test system designed for an airborne oxygen monitor can be used to test the correctness and reliability of its functions and performance, and the testing process can be fully automated, and the test data can be displayed in real time and the test report can be generated. Because the testing and debugging of this type of oxygen monitor mainly depend on the serial communication with the electronic device, and the corresponding automatic test system contains many sensors and instruments that need to communicate. In order to realize the communication of the electronic equipment, it can not only carry out the remote field single machine communication, but also satisfy the multi-unit network communication in the corresponding automatic test system. This paper designs and improves a new kind of single bus interface scheme which is suitable for application environment by studying some bus interface technology based on single signal wire. The communication interface scheme adopts the master-slave structure of single signal line, and the corresponding host interface circuit and slave interface circuit are designed. Among them, the slave interface circuit is designed with low power consumption, which belongs to the passive interface, the structure is simple and the cost is low; the host computer interface circuit adopts the dual voltage design of the transceiver and the transmitter, in which the transmission circuit is driven by the power MOS transistor, and the three-state output is used. The receiving circuit adopts A-D conversion, partial voltage receiving and corresponding protection circuit. After modeling the transmission line, the circuit simulation test of the whole communication network is carried out. The experimental results show that the communication distance of the new bus can reach 2000m, the transmission rate can reach 38400bit / s, and the number of driving slave nodes can reach 450 when the transmission medium is selected under the condition of No. 5 twisted-pair wire. Finally, a portable communication calibration module is designed and applied to the automatic test platform of oxygen monitor. Thus, the debugging method of this type of oxygen monitor is extended. The interface described in this paper is used in the communication design of the oxygen monitor in hardware; the corresponding protocol processing program and calibration debugging program are designed based on MSP430 MCU in software; finally, the conversion from serial port to USB port of MSP430 single chip microcomputer is realized by PL2303 chip. Through this module, the automatic test platform of oxygen monitor can detect the oxygen monitor in real time, and it can be calibrated and debugged automatically.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：V245.31;TN802

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