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Automatic address identification handshaking method of share type bus under master-slave communication mode

A technology of shared bus and communication mode, applied in the direction of bus network, data exchange through path configuration, digital transmission system, etc., to achieve the effect of saving address setting equipment, improving work efficiency and simplifying operation steps

Active Publication Date: 2012-08-22
JIANGSU EAST CENTURY NETWORK INFORMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the installer needs to carry the equipment required for setting the address; and when setting the address on site, it can only be set to the agreed address value, which requires high technical quality for the installer

Method used

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  • Automatic address identification handshaking method of share type bus under master-slave communication mode
  • Automatic address identification handshaking method of share type bus under master-slave communication mode
  • Automatic address identification handshaking method of share type bus under master-slave communication mode

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Embodiment Construction

[0028] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0029] Shared bus master-slave communication structure such as figure 1 As shown, it includes a main control module 1 , a shared bus 2 and a measurement control terminal 3 . There can be multiple measurement control terminals on the bus, and the number depends on the actual project needs and is limited by the driving capability of the shared bus.

[0030] This specific implementation mode is described by taking the RS485 shared bus as an example.

[0031] When performing master-slave communication, the master control module and the measurement control terminal firstly perform handshaking according to the following steps:

[0032] A. The main control module sends super commands to all measurement control terminals on the shared bus;

[0033] In this specific embodiment, the data frame formats of the super command, the response data packet and the conf...

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Abstract

The invention discloses an automatic address identification handshaking method of a share type bus in a master-slave communication mode. In the handshaking method, response data packets can be sequentially sent after each measuring control terminal receives a super command sent by a main control module by means of corresponding delayed duration determined according to an obtained modulus and the maximum delivery number of the measuring control terminals, which is required by a measuring control terminal delivery address for a shared bus, therefore a majority of measuring control terminals areguaranteed to normally report addresses to the main control module; and moreover, the probability of bus confliction is further reduced by adopting intercepting index avoidance algorithm delay and a bus monitoring method. When field installation is carried out on equipment adopting the share type bus in the master-slave communication mode, the method ensures that the operation steps of installation personnel are simplified, working efficiency is improved and address setting equipment is simultaneously saved.

Description

technical field [0001] The invention relates to the technical field of industrial field shared bus communication, in particular to the technical field of bus communication in which a master-slave mode needs to be manually set for a slave module. Background technique [0002] In the industrial measurement control field, the communication mechanism of master-slave mode is generally adopted, that is, a master control module communicates with multiple measurement control terminals through a shared bus (such as RS485, RS422, etc.), and the master control module specifies the address through the command packet protocol. Communicate with specific measurement control terminals on the bus. After receiving the command packet sent by the main control module, all measurement control terminals on the shared bus judge the address part in it, if it matches their own address, process the command and reply the response data packet, otherwise simply discard the command Bag. When the equipme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/40H04L12/56H04L29/12
Inventor 雷红路李祥明童跃斌
Owner JIANGSU EAST CENTURY NETWORK INFORMATION
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