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Preemptive multi-master RS485 bus communication method based on dynamic priorities

A technology of dynamic priority and bus communication, which is applied in the direction of instruments, electrical digital data processing, etc., can solve the problems of limited number of equipment, low bus utilization rate, long control response time, etc., and achieve the effect of improving use efficiency and increasing quantity

Active Publication Date: 2021-01-15
CHINA COAL TECH ENG GRP CHONGQING RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a preemptive multi-master RS485 bus communication method based on dynamic priority to solve the problems of low bus utilization, limited number of devices, and long control response time

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  • Preemptive multi-master RS485 bus communication method based on dynamic priorities
  • Preemptive multi-master RS485 bus communication method based on dynamic priorities
  • Preemptive multi-master RS485 bus communication method based on dynamic priorities

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Embodiment Construction

[0025] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0026] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should...

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Abstract

The invention relates to a preemptive multi-master RS485 bus communication method based on dynamic priority, which belongs to the field of coal mine safety monitoring, and comprises the following steps: S1, a bus is in a half-duplex mode, is connected with a plurality of nodes with the same frame format, and can monitor the bus while occupying the bus to send data; S2, all the nodes are main devices and have unique ID numbers and variable bus use priorities; S3, before each node sends the data, a bus state is monitored, and if the bus is busy, frame priorities are compared; S4, each node monitors the data on the bus when sending the data, sending immediately stops if the frame on the bus is inconsistent with the frame sent by each node, and delays sending; and S5, after the frame being sent by a communication node is preempted, each node adjusts the priority of the next sending according to a priority dynamic adjustment algorithm. According to the invention, the number of bus nodes isincreased, and the bus use efficiency is fully improved.

Description

technical field [0001] The invention belongs to the field of coal mine safety monitoring and monitoring, and relates to a preemptive multi-master RS485 bus communication method based on dynamic priority. Background technique [0002] At present, the coal mine safety monitoring system has basically realized digital upgrading, and the sensing layer, transmission layer, and application layer equipment have all adopted digital transmission. In the coal mine safety monitoring system, 5.7.5 of "AQ 6201-2019 General Technical Requirements for Coal Mine Safety Monitoring System" clearly requires that "the execution time of local control shall not exceed 2s". This requires that the communication time between sensors, controllers and actuators at the sensing layer in the monitoring system is less than 2s. At present, most of the sensing layers in digital communication use two-wire (half-duplex) "master-slave" RS485 bus , all sensors, controllers and actuators on the bus are managed b...

Claims

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Application Information

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IPC IPC(8): G06F13/40G06F13/42
CPCG06F13/4004G06F13/4282G06F2213/0002
Inventor 周德胜梁光清孙世岭于庆李涛柏思忠赵庆川张远征蒋洪庆苟怡刘芬但强王博文
Owner CHINA COAL TECH ENG GRP CHONGQING RES INST
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