What are single-master and multi-master systems

・In Japanese
Prerequisite knowledge
・CAN communication

■Multi-master method
This is a method in which there is no superiority or inferiority between nodes in the timing of starting communication within the network, and the node that starts transmitting first can obtain the right to transmit. CAN communication uses this method. When multiple nodes try to transmit at the same time, a method to avoid collisions is required, and CSMA/CA method (Carrier Sense Multiple Access/Collision Avoidance) and other methods are used.

The CSMA/CA method is a method in which if another node is communicating, a random number of waiting times is set, and communication is resumed after the waiting time has expired.



■Single master method
One node in the network becomes the master and controls the communication timing of other nodes (slaves). The slaves do not send signals until the master requests them. This is also called the master-slave method. LIN communication uses this method.

List of related articles TOP MENU Communication technology Serial communication ・CAN,LIN communication ・SENT communication ・USB Communication ・Ethernet ・SPI Communication ・Parity, Check sum, CRC ・Data transfer speed ・Clock synchronous, Asynchronous methods ・Differential Signaling ・PLC, Superimposed Circuit ・Single/multi-master system Network communication ・Message authentication, Digital signature