Unlock instant, AI-driven research and patent intelligence for your innovation.

Baud rate identification method and data flow control method of isolated rs485/rs422 relay isolator

An identification method and baud rate technology, applied in the field of communication, can solve the problems of poor real-time data flow, low precision, and the repeater does not have baud rate adaptation, so as to achieve the effect of strengthening control and realizing data.

Inactive Publication Date: 2017-06-20
HARBIN UNIV OF SCI & TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the problem that the traditional repeater usually does not have the function of baud rate self-adaptation, the precision is low, and the real-time performance of the direction control of the data flow is poor, thereby providing an isolated RS485 / RS422 repeater isolator. Baud rate identification method and data flow control method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Baud rate identification method and data flow control method of isolated rs485/rs422 relay isolator
  • Baud rate identification method and data flow control method of isolated rs485/rs422 relay isolator
  • Baud rate identification method and data flow control method of isolated rs485/rs422 relay isolator

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0033] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the baud rate identification method of the isolated RS485 / RS422 relay isolator described in this embodiment, the method is realized by the following steps, and the steps include:

[0034] Idle state step: the relay isolator is in the idle state, receives the measurement signal, and judges whether the signal is valid, if the judgment result is yes, then sets i to 0, and performs the waiting step; if the judgment result is no, returns to the idle state and waits receive measurement signals;

[0035] where i represents a count value;

[0036] Waiting step: in this step, set the i-th measured value cnt[i]=0, and judge whether there is a clock falling edge on the receiving pin of the relay isolator, if the judgment result is yes, then execute the operation step; if the judgment result is no , re-execute the waiting step;

[0037]Operation steps: In this step, add 1 to the value...

specific Embodiment approach 2

[0047] Specific implementation mode two: the following combination figure 2 This embodiment is described. This embodiment is based on the data flow control method of the isolated RS485 / RS422 relay isolator of the specific embodiment one. The method is realized by the following steps, and the steps include:

[0048] Idle state step: the receiving enable signal is valid, the sending enable signal is invalid, judge whether the left and right data receiving pins of the relay isolator have signal falling edges at the same time, if the judgment result is yes, then execute this step again; the judgment result is No, that is, only the signal falling edge appears on the left or right side, then set cnt to 0, and perform the waiting step; in this step, the subsequent steps of the data receiving pins on the left and right sides are the same;

[0049] Waiting steps: turn off the receiving enable signal on the right side, turn on the sending enable signal on the right side, and add 1 to t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a baud rate recognition method and a data flow control method of an isolated type RS485 / RS422 relay isolator, and relates to the technical field of communication. The baud rate recognition method and the data flow control method of the isolated type RS485 / RS422 relay isolator aim to solve the problem that a traditional repeater usually does not have the function of baud rate self-adaption and is low in accuracy, so that real-time performance of data flow direction control is poor. By means of the baud rate recognition method and the data flow control method of the isolated type RS485 / RS422 relay isolator, automatic recognition of the baud rate and communication data flow direction control are achieved, the data flow direction control is greatly enhanced by ten percent, corresponding hints to bus conflict and bus fault are given, and precision is increased by 15 percent; a high performance signal isolation chip and an isolation power source are adopted to achieve absolute isolation of data at the two ends of the repeater. The baud rate recognition method and the data flow control method of the isolated type RS485 / RS422 relay isolator are suitable for the technical field of communication.

Description

technical field [0001] The invention relates to the technical field of communication. Background technique [0002] RS485 / RS422 asynchronous communication is a bus standard widely used in the field of industrial control at present. When the actual number of nodes exceeds the maximum limit, or the communication distance is too long and the interference is too large, how to ensure the complete and reliable transmission of information is a huge challenge in the communication system. In practical applications, the method of inserting repeaters on the bus is generally used to solve this problem, such as image 3 shown. In the two-wire half-duplex communication system, the traditional repeater usually does not have the function of baud rate self-adaptation, or has a simple adaptability with low precision, or has a certain dependence on the host. The host sends specific bytes to complete baud rate identification, resulting in poor real-time control of data flow direction, which l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/40
Inventor 王建民赵有以任会权
Owner HARBIN UNIV OF SCI & TECH