共查询到19条相似文献,搜索用时 500 毫秒
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本文提出一种应用于网络化公共广播系统的串口网桥,为公共广播系统的控制主机和广播终端之间提供了透明数据传输服务。使得能将传统公共广播系统终端应用于网络化公共广播系统中,为实现传统公共广播系统向网络化公共广播系统的升级提供了一种有效的解决方案。该串口网桥的硬件设计基于高集成度的网络单片机MC9S12NE64,配合基于嵌入式TCP/IP协议栈OpenTCP的软件,具有结构简洁,体积小,功耗低,效率高和灵活性强的优点。 相似文献
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针对传统机器人控制系统存在的跨平台开发和部署问题,提出了一种基于ROS(Robot Operating System,机器人操作系统)网桥的跨平台网络化人机交互系统。构建以Node.js框架为服务后端,Bootstrap框架和jQuery组件为交互前端的网络化控制系统架构,通过ROS网桥技术实现万维网(World Wide Web, WWW)端和机器人端的跨平台数据互通,并按需进行机器人控制服务化调用。实验结果表明,该控制系统能够实现机器人端环境感知、状态监视、远程控制等功能,支持个人电脑(Personal Computer, PC)端、移动端等泛平台人机交互,具有可模块化敏捷开发、移植扩展性强等优点。 相似文献
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基于物联网技术的智能家居采暖远程控制系统设计 总被引:1,自引:0,他引:1
陈铁民 《计算机测量与控制》2017,25(12):90-94
随着物联网技术的高度发展,智能家居在采暖领域焕发了新活力,壁挂炉因具有强大的集中供暖能力,能广泛应用在我国北方大面积采暖领域,但传统壁挂炉的控制方式不具备网络化功能,为了解决壁挂炉传统控制方式的不足,提出基于物联网技术的智能家居采暖远程控制系统;该系统保留了原有壁挂炉显示面板和控制面板的串口通讯方式,在中间增加一个基于OpenWrt路由器的数据采集模块,在维持系统原有的通讯情况下,完成了壁挂炉的远程控制;经实验测试,搭载远程控制APP的移动终端能与网络化改造后的壁挂炉正常通讯,并完成指定操作;同时,壁挂炉也充当家庭网关,自动组建家庭网络,以供其他移动设备连接;该系统使用户摆脱了近距离操作壁挂炉温度参数的限制,使壁挂炉的控制变得更智能、更便捷,也为壁挂炉的远程控制提供可参考的网络化改造方案。 相似文献
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基于Android平台的数据采集系统设计 总被引:1,自引:0,他引:1
传统数据采集系统因其上下位机采用串口连接致使测量人员移动范围与操作灵活性降低,基于此,该文设计一种基于手持平台的蓝牙数据采集系统,以实现采集过程中上下位机的无绳分离,达到无线采集的目的.系统采用蓝牙通讯协议作为通讯方案取代传统的有线串口,以时下应用广泛的Android操作系统移动终端作为上住机,并在该终端设计系统软件,实现移动、便携地进行数据采集,并将接收到的有效数据以文件方式存储.在实际工作环境下对该系统进行测试,实践证明该无线采集系统能稳定、有效地采集数据,实现测量数据无线传输. 相似文献
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利用LG=K120S系列PLC与LG-IG5系列变频器共同组成PLC-多变频器同步控制系统,详细说明了利用RS485通信网络、MODBUS通信协议构成同步控制系统的系统组成、工作原理与控制算法等,并利用计算机通过公用电话网对系统进行监控,已在实践中得到应用。 相似文献
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蒋小莺 《数字社区&智能家居》2007,1(6):1572-1574
为了免除在不同的通讯终端上重复输入或者修改地址信息的麻烦,设计一种移动统一地址簿系统,在SyncML数据同步协议的基础上,实现在移动终端与互联网应用服务器间进行地址簿数据的交换。 相似文献
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针对智能充电站的应用要求,提出通讯技术在电动汽车充电站中的设计方案。论述充电站的监控系统三层通讯整体结构;提出充电机监控系统双CAN通讯网络;对充电站主要设备充电机、充电桩的内部多种通讯方式和功能进行描述和方案设计;对通讯过程中采用的CAN通讯、以太网和串行通讯接口进行设计并对其通讯协议进行讨论和说明。 相似文献
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Nowadays, more and more field devices are connected to the central controller through a serial communication network such as fieldbus or industrial Ethernet. Some of these serial communication networks like controller area network (CAN) or industrial Ethernet will introduce random transfer delays into the networked control systems (NCS), which causes control performance degradation and even system instability. To address this problem, the adaptive predictive functional control algorithm is derived by applying the concept of predictive functional control to a discrete state space model with variable delay. The method of estimating the network-induced delay is also proposed to facilitate the control algorithm implementing. Then, an NCS simulation research based on TrueTime simulator is carried out to validate the proposed control algorithm. The numerical simulations show that the proposed adaptive predictive functional control algorithm is effective for NCS with random delays. 相似文献
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Modern high speed local area networks offer great potential for communication intensive applications, but their performance is limited by the use of traditional communication protocols, such as TCP/IP. In most cases, these protocols require that all network access be through the operating system, which adds significant overhead to both the transmission path (typically a system call and data copy) and the receive path (typically an interrupt, a system call, and a data copy). To address this performance problem, several user level communication architectures have been developed that remove the operating system from the critical communication path. The article describes six important issues to consider in designing communication protocols for user level architectures. The issues discussed focus on the performance and semantics of a communication system. These issues include data transfer, address translation, protection, and control transfer mechanisms, as well as the issues of reliability and multicast. To provide a basis for analyzing these issues, the authors present a simple network interface protocol for Myricom's Myrinet network, which has a programmable network interface. Researchers can thus explore many protocol design options, and several groups have designed communication systems for Myrinet. The authors refer to 11 such systems, all of which differ significantly in how they resolve these design issues but all of which aim for high performance and provide a lean, low level, and more or less generic communication facility 相似文献
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Mobile computing requires an advanced infrastructure that integrates suitable support protocols, mechanisms, and tools. This mobility middleware should dynamically reallocate and trace mobile users and terminals and permit communication and coordination of mobile entities. In addition, open and untrusted environments must overcome system heterogeneity and grant the appropriate security level. Solutions to these issues require compliance with standards to interoperate with different systems and legacy components and a reliable security infrastructure based on standard cryptographic mechanisms and tools. Many proposals suggest using mobile agent technology middleware to address these issues. A mobile agent moves entities in execution together with code and achieved state, making it possible to upgrade distributed computing environments without suspending service. We propose three mobile computing services: user virtual environment (UVE), mobile virtual terminal (MVT), and virtual resource management (VRM). UVE provides users with a uniform view of their working environments independent of current locations and specific terminals. MVT extends traditional terminal mobility by preserving the terminal execution state for restoration at new locations, including active processes and subscribed services. VRM permits mobile users and terminals to maintain access to resources and services by automatically requalifying the bindings and moving specific resources or services to permit load balancing and replication 相似文献