通信系统

The design of the interface modules of the control system is the following work. They were the interfaces connecting controller with digital, analog network, and the monitor computer respectively.

紧接着展开了对控制系统通信部分的研究开发工作，结合相关的芯片技术，设计了系统的数字通信模块、模拟通信模块、监控计算机通信模块；在现场模拟量的输入／输出模块，利用两片8255扩展了48个I／O端口，实现对现场设备的远程控制。

In this paper, firstly we researched the relationships of the communicating distanceand the channel characteristic, the effect of the multiple scattering to the laserpropagation, the requirement of the laser communication to the ATP system and theway to determine the angular dispersion and receive field of view. It is proved that inlight haze weather, letting the input and output laser\'s wavelength are diferrent witheach other, after passing by the filter, it can avoid backward scattering effectually andfor the communication within 15km, the influence of the multiple scattering inatmosphere can be ignored.

论文对通信距离与信道特性、多次散射对光传输的影响、无线激光通信对ATP带宽的需求以及光束发散角和接收视场角等重要系统性能参数和指标进行了分析和研究，证明了在轻霾天气状态下，使系统中两终端发送的激光束波长各不相同，经过光束滤波，可以有效地消除后向散射干扰；在15km的通信距离范围内，大气中的多次散射对无线激光通信光传输的影响可以忽略。

In order for a computer to communicate directly with the Distributed Control System, this paper explains the structure of the INFI 90 type DCS made by the Baily Control Company in America in detail. By means of analyzing its inner agreement on communication, an interface between the INFI 90 type DCS and the computer is designed, which includes the software and hardware.

为了实现微机直接与集散控制系统间通信，详细分析了美国贝利控制公司研制的INFI－90集散控制系统的结构组成，通过剖析该系统的内部通信协议约定，设计了微机与INFI－90集散系统通信接口，它包括硬件和软件两部分，其中软件由Borland C＋＋语言编程实现。

This situation, especially for circuital resource administration, has brought about big challenge. We need to build a set of management system to satisfy the need of communication resource management, which is high-effect.

作为电力安全生产的支撑网络，电力通信网络也在随电网的发展不断扩大覆盖范围，这对通信资源管理特别是电路资源管理带来了严峻的挑战，迫切需要建立一套以数据为中心的通信资源管理系统来满足系统管理及通信调度的需求。

To resolve the problem of the communication and control subsystem design and implementation on the Multi-processor Tight Coupling YH Digital Control Wire-cut System, the paper has discussed the communication and processing controlling method between master CPU and slave processor controlling board under Windows environment.

针对多机紧耦合YH数控线切割系统通信与控制子系统的设计与实现课题，讨论了在Windows环境下实现主CPU与从处理器控制板的通信与加工控制方法，对多机紧耦合系统中的通信代码设计、数控加工控制软件设计及其在YH数控线切割系统上的实现作了详细的叙述

The modularized control program is developed with ladder chart to implement functions of system startup and shutdown,bin pump cycle control,fault alarm and so on.

同时，PLC系统通过相应的通信模块挂在分散控制系统通信总线上，实现数据通信，以便DCS系统掌握各辅助工艺系统情况，协调全厂工作。

The spread spectrum communications are widely used in modern military communications, satellite communications, mobile communications and command, control, communication and intelligence( C~3I ) systems, because of its well multi-address access, low probability of interception, excellent performance of anti-jamming and secrecy.

扩展频谱通信作为新型的通信方式，由于其具有多址接入、低载获特性和较强的抗干扰能力，因此在现代军事通信、卫星通信、移动通信和指挥控制通信和情报(C~3I)系统中得到了广泛的应用。

A communication information graph extraction methodis proposed, which automates the CIG extraction process from the system behavior model to help system designers construct efficient on-chip communication architecture in the early stage of system design.

提出通信信息图提取方法CIG-EM，实现了从系统行为级模型到通信信息图模型提取的自动设计流程，以帮助系统设计人员在系统设计的早期设计高效的片上通信体系结构。

Virtual instrument technology is utilized and products are focused in fault detection system for cable inflator/air pressure monitor system and, fault detection system for communication fibre and it was categorized as 2001 National Torch Plan.

公司应用虚拟仪器技术，专为电信系统研制生产的电缆充气机/气压监测系统、虚拟通信光纤故障检测系统，使得通信故障检测和故障定位更精确，管理更方便，虚拟通信光纤故障检测系统更被列入2001年国家级火炬计划。

Taking the communication server as the core,the data transmission layer collects data from other intelligent devices with 103 protocols,Modbus protocols,pro-bus protocols or TCP / Modbus protocols,which are converted as dual Ethernet network data and then transmitted to monitoring system and dispatch center via hub.

重点介绍了通信网络的构成，网络管理层基于TCP/IP的以太网络通信，采用站内103通信规约，数据传输层以通信服务器为核心，向下采集其他智能设备数据，支持任何采用103规约及采用Modbus通信规约、pro-bus通信规约或采用TCP/Modbus协议的智能设备，并将采集到的数据转换成以太网双网数据，通过交换机上传至监控系统及调度中心。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。