Master-slave multi-computer communication system, master computer, slave computers and slave computer ID (identification) assigning method

Abstract

The invention discloses a master-slave multi-computer communication system, a master computer, slave computers and a slave computer ID (identification) assigning method for assigning slave computer ID without increasing hardware cost. The method includes the steps: generating a broadcast command carrying a current value of a counter and transmitting the broadcast command to all the slave computers; judging whether ID unassigned slave computers are present in the system or not; updating the current value of the counter and generating and transmitting the broadcast command carrying the updated current value of the counter to all the slave computers when receiving data returned by a bus competition slave computer if the ID unassigned slave computers are present in the system; judging whether ID unassigned slave computers are present in the master-slave multi-computer communication system or not again until judging that ID is assigned for all the slave computers. The broadcast command is used for controlling the ID unassigned slave computers to participate in bus competition, and the bus competition slave computer is used for storing the current value of the counter carried by the broadcast command as a sole ID and stopping the data transmission function of the slave computer.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, relates to a master-slave multi-machine communication system, a master, a slave, and a slave ID distribution method. Background technique [0002] The master-slave multi-machine communication system is a communication network composed of an upper host computer (referred to as the host) for management and several lower slave computers (referred to as the slaves) that directly participate in the control and detection, and are connected to the same bus. Such as figure 1 shown. The communication data transmission authority of the entire communication network is controlled by the master, and the slave can only passively receive and execute the commands sent by the master and return data according to the requirements of the master. When the host performs point-to-point communication with the slave, it needs to know the ID of the slave in advance to achieve communi...

AI Technical Summary

Problems solved by technology

[0003] The commonly used slave ID allocation method is to use a hardware circuit such as a dial switch to allocate the ID of each slave. However, due to the need to add additional hardware circuits, the cost of the hardware increases, and the more the number of slaves, the more complex the hardware circuit design.

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