05701-A-0330 数字数据通信协议 提供一组广泛使用的标准命令

【产品详情】

读者应该熟悉下面使用的术语

在本说明书中:

MODBUS: MODBUS是一种数字数据通信协议

提供一组广泛使用的标准命令

哪些系统数据可以与外部通信

设备。

RS485: RS485是一种使用双绞线的电气标准

对携带差分信号的电缆进行数字传输

数据。RS485最多支持32个收发节点

连接到单双绞线高速公路上进行“多跌落”双向操作，距离可达1.2公里

(3900英尺)。

RS422: RS422是采用双绞线的电标准

对携带差分信号的电缆进行数字传输

数据。RS422允许一个驱动器和多达10个

接收节点要连接到高速公路上

作业距离可达1.2公里(3900英尺)。

RS232: RS232是一种多核的电气标准

传送数字数据信号的电缆。RS232

允许两个通信设备互连

双向操作距离可达15米

(49英尺)。

波特率:波特是表示信令速度的单位，等于数字

每秒钟的离散信号事件。(不一定是

与比特每秒相同)。

比特率:通常传输比特的速度

单位为比特/秒(bits/s)。

奇偶校验:一种检测数据中单个比特错误的技术

电子代码中传输的数据字节(字符)

传播。

停止位:表示传输数据结束的一种方法

电子代码传输中的字节(字符)。

全双工:指通信系统能够

同时双向独立传输

数据。

半双工:指通信系统能够

传输数据的任何一个方向，但不是

同时进行。

MAN0502。PM6版本04 Oct 99 MODBUS接口模块

05701 m5006

单纯型:指通信系统能够

仅在单一方向上传输数据。

多路:由多个通信设备共享的一条通信线路

设备或“节点”的数量。

节点:数据中存在的智能设备

能够进行通信的通信系统。

主机:主机系统是控制系统的主设备

系统操作。一般来说，主机可以是PLC，

DCS或SCADA图形包。

主设备:主设备是控制传输的节点

通过发出请求在通信系统中获取数据

从设备。

从属设备:从属设备只将数据传输到

响应一个请求的通信线路

主设备。

05701-A-0330 数字数据通信协议 提供一组广泛使用的标准命令

【英文介绍】

The reader should be familiar with the terminology used below

In this specification:

MODBUS: MODBUS is a digital data communication protocol

Provides a widely used set of standard commands

Which system data can be communicated to the outside world

Equipment.

RS485: RS485 is an electrical standard that uses twisted pair cables

Digital transmission of a cable carrying a differential signal

Data. The RS485 supports a maximum of 32 transceiver nodes

Connect to the twisted pair highway for "multiple  drop" two-way operation, the distance can reach 1.2 km

(3,900 feet).

RS422: RS422 is the electrical standard using twisted pair wire

Digital transmission of a cable carrying a differential signal

Data. The RS422 allows one drive and up to 10

The receiving node is connected to the highway

The operating distance is up to 1.2 km (3,900 ft).

RS232: RS232 is a multi-core electrical standard

A cable for transmitting digital data signals. RS232

Allows two communication devices to connect

Two-way operating distance up to 15 meters

(49 feet).

Baud rate: Baud is a unit of signaling speed, equal to a number

Discrete signal events per second. (Not necessarily

Same as bits per second).

Bit rate: The speed at which bits are normally transmitted

The unit is bits per second (bits/s).

Parity: A technique for detecting errors in a single bit of data

Data bytes (characters) transmitted in electronic code

Spread.

Stop bit: A method of indicating the end of data transmission

Bytes (characters) in electronic code transmission.

Full duplex: indicates that the communication system can

Simultaneous bidirectional independent transmission

Data.

Half duplex: indicates that the communication system can

Transmit data in either direction, but not

At the same time.

MAN0502. PM6 Version 04 Oct 99 MODBUS interface module

05701 m5006

Simple type: refers to the communication system can

Data is transmitted in a single direction only.

Multiway: A communication line shared by multiple communication devices

Number of devices or nodes.

Node: A smart device that exists in data

A communication system capable of communication.

Host: The host system is the main device that controls the system

System operations. In general, the host can be a PLC,

DCS or SCADA graphics package.

Master device: The master device is the node that controls the transmission

Obtain data in the communication system by making a request

From the device.

Slave device: Slave device only transfers data to

A communication line that responds to a request

The main device.

05701-A-0330 数字数据通信协议 提供一组广泛使用的标准命令

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