系统压力或差压变送器信号输出采用HART现场总线协议，数字信号传输通过RS485进行MODBUS通讯。
HART field-bus protocol is used in output of system pressure or differential pressure transmitter, digital signals is transmitted with MODBUS via RS485.
为了加快工作，基金会现场总线和ISA达成了一个交叉许可协议，允许这两个组织就无线网络进行合作。
To expedite the work, the Fieldbus Foundation and ISA have entered into a cross-licensing agreement allowing the two organizations to collaborate on wireless networks.
本文首先介绍了现场总线CAN通信协议。
Introduce the communication agreement of field bus CAN at first.
研究现场总线访问子层为通信提供的虚拟通信关系的工作情况和内部协议状态机。
These descriptions include operations of virtual communication relationships which are provided by the FAS for communication, and FAS protocol state machines.
为达到此目标，现场总线网络从硬件和通信协议上对传统网络作出了改进。
Aiming at this goal, it improves its hardware and communication protocol from traditional computer networks.
介绍了一种以太网与CAN现场总线之间协议转换网关的设计与实现。
This paper introduces a kind of designing and realizing a gateway for transfer protocol between CAN bus and Ethernet.
最后介绍了采用协议转换原理研究开发的一种支持工业以太网与多种现场总线技术转换的多协议转换器。
A multiple protocol converter developed by using protocol conversion principle is introduced finally, it supports industrial Ethernet and multiple field bus technology conversion.
基金会现场总线(简称FF)是当前过程控制领域最有前途的现场总线，FF协议智能仪表是目前新一代现场总线仪表。
Foundation Feildbus (FF) is the best promising field bus in process control fi-eld. Smart transmitter based on FF protocol is the newest field bus instrument.
OPC规范和IEC 61499标准在现场总线控制系统中均属于用户层协议，二者都基于组件技术。
OPC specifications and IEC 61499 standard both are protocols of User Layer of FieldBus Control System(FCS), and both are based on software component technology.
HART协议是现场总线的一种过渡性协议，可使数字与模拟信号同时传送且互不干扰，实现双向通讯。
HART protocol which is the transitional protocol of field-bus allows transferring both digital signal and analog signal simultaneously in order to actualize bidirectional communication.
分析了工控领域广泛应用的现场总线PROFIBUS-DP与MODBUS的协议结构与数据传输方法、设计协议转换网关的可行性以及网关的电路设计与工作流程。
The structures of two widely used fieldbus, i. e. , PROFIBUS-DP and MODBUS are analyzed, as well as the data transmission methods and the feasibility to design the protocol conversion gateway.
介绍了几种目前比较流行的现场总线，重点分析了CAN总线的性能特点和协议结构以及由CAN总线构成的网络控制系统及时延特性。
Emphasize on analysing the features of CAN and the structure of the CAN bus protocol. Finally the NCS constituted by CAN bus and its time delay are analysed.
应用HART协议的智能测量仪表和智能执行机构变频器，通过可编程控制器实现总线连接和通讯监控，实现流浆箱的现场总线控制方案。
HART communication smart transducer and brainpower actuator brainpower by A PLC to field bus and communication monitoring, The way is head box field bus control system.
着重研究了现场总线profibus - PA采用的数据传输协议、适用的场合和与现场智能设备连接的方法。
Especially data transmission protocol, applicative occasion and connective means with field intelligent devices of PROFIBUS-PA are studied.
控制系统采用现场总线技术，文章详细阐述了系统的通讯协议和控制流程。
Fieldbus technology is used in control system, the communication protocol and control flow is discussed in detail.
HART协议是现场总线的一种过渡性协议，可使数字与模拟信号同时传送且互不干扰，实现双向通讯。
HART communication protocol which belongs to transitional protocol introduced in this paper is rudiment of field bus, which permits transmitting digital signal on analog signal circuit.
在分析了数控系统通信网络结构和通信特点的基础上，提出了一种新的现场总线时钟同步协议。
Based on the analysis of nc system's communication net architecture and characteristics, a new time synchronization protocol was proposed.
该网关在网络的物理层和数据链路层完成协议转换，解决了现场总线和以太网无法实现直接通信的问题。
The conversion was finished on the physical layer and the data link layer, and the problem of direct communications between fieldbus and Ethernet was solved.
该网关在网络的物理层和数据链路层完成协议转换，解决了现场总线和以太网无法实现直接通信的问题。
The conversion was finished on the physical layer and the data link layer, and the problem of direct communications between fieldbus and Ethernet was solved.
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