Communication method of master-slave system and the master-slave system

Abstract

The invention discloses a communication method of a master-slave system and the master-slave system and relates to the master-slave system technology field. The master-slave system comprises one piece of master equipment and a plurality of slave equipment. The master equipment successively sends a roll-call message used for carrying out roll call on the plurality of slave equipment according to a polling time interval and based on a polling sequence, and receives response data sent by the named slave equipment. In an idle period of the polling time interval, a priority communication application period is divided. The master equipment detects whether the slave equipment sends first data in the priority communication application period. If the slave equipment sends the first data in the priority communication application period, the master equipment receives the first data and carries out corresponding processing. By using the communication method and the system, the slave equipment can send data in the idle period of the polling time interval, can apply for priority communication, and can preferentially complete data interaction with a high real-time requirement through adjusting a polling sequence; control time delay generated because communication real-time performance of the master-slave system is not high can be reduced; and a user experience degree is increased.

Description

technical field [0001] The present invention relates to the technical field of master-slave systems, in particular to a communication method of the master-slave system and the master-slave system. Background technique [0002] Currently, master-slave systems are widely used. For example, the 485 bus is used for communication in the air conditioner system, and the master and slave adopt the master-slave communication mode. During the communication, the master initiates the roll call, and the slave replies to the master after receiving the roll call from the master, and completes a communication between the master and the slave. interact. The master-slave system using 485 bus such as figure 1 As shown, the master is the upper computer, and the slaves A, B, and C are the lower computers. The upper computer (host with CPU) regularly calls a lower computer (slave), and the named lower computer replies with data, and the other lower computers are in the monitoring state. The m...

AI Technical Summary

Problems solved by technology

However, when the number of slaves in the master-slave system is large, it takes a long time for the master to complete a round of roll call

When the slave has sudden or urgent information, it must wait until the master rolls its own name before sending the sudden or urgent information. For applications with high real-time requirements, it is easy to cause control delay and affect user experience.

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