Multi-master networking communication method

Abstract

The invention proposes a multi-master networking communication method. A reasonable algorithm is utilized to enable each node of the multi-master networking to dynamically allocate the sending time according to different step lengths and rates and certain rules, so the conflict probability is greatly reduced, the normal sending probability of the data of each node on the bus is improved, the data is prevented from being blocked for a long time, the communication baud rate and the period time are improved, the number of communication nodes is increased, the application range is expanded, reliable operation of multi-node networking communication under the high communication baud rate and the fast communication period is guaranteed, and the real-time control requirement is met.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for periodically sending data on a multi-master network. Background technique [0002] Traditional multi-node multi-master networking has the problems of low communication baud rate, slow communication cycle, fewer communication nodes, and limited application range, and some nodes are blocked by arbitration for a long time, resulting in data loss all the time, which may cause Unexpected risk, if you want to make the communication run effectively when the bus load is heavy, that is, there are many communication nodes, the communication baud rate is high, and the communication cycle is fast, so as to prevent the bus from being blocked due to large-scale retransmission, generally choose to cancel A post-conflict retransmission mechanism, but adopting such a mechanism will cause multiple nodes to send data within the same frame data length, and multiple nodes t...

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Problems solved by technology

[0002] Traditional multi-node multi-master networking has the problems of low communication baud rate, slow communication cycle, fewer communication nodes, and limited application range, and some nodes are blocked by arbitration for a long time, resulting in data loss all the time, which may cause Unexpected risk, if you want to make the communication run effectively when the bus load is heavy, that is, there are many communication nodes, the communication baud rate is high, and the communication cycle is fast, so as to prevent the bus from being blocked due to large-scale retransmission, generally choose to cancel A post-conflict retransmission mechanism, but adopting such a mechanism will cause multiple nodes to send data within the same frame data length, and the subsequent multiple nodes will always face a ruling and cannot send successfully, resulting in communication failure

[0003] see figure 1 , in the prior art, a multi-node multi-master network uses a transmission speed of 500kBit / s to transmit data of 127Bit in an extended frame, and it takes 0.25ms. Node 1 starts sending data at time t1, and it will be 0.25ms later. The transmission ends at te time, during which the bus will be occupied. If node 2 and node 3 send a transmission request within the data transmission period of node 1 (tx=0.25ms), they will be arbitrated, resulting in transmission failure. If nodes 2 and 3 Node 3 always sends a sending request within the time period when node 1 sends a data frame, then the sending request of node 2 and node 3 will always be arbitrated, resulting in communication failure

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