What is the difference between Modbus master and slave?

The difference between Modbus master and slave is that they issue different commands, have different uniqueness, and have different interfaces.

1、 Issuing instructions differently

1. Modbus Master: Modbus Master can actively issue commands.

2. Modbus Slave: Modbus slaves do not actively issue commands.

2、 Unique difference

1. Modbus Master: Modbus Master has uniqueness.

2. Modbus Slave: Modbus slaves do not have uniqueness and can have multiple.

3、 Connecting with different

1. Modbus master: Modbus master can interface with multiple Modbus slaves.

2. Modbus Slave: Modbus Slave functions to interface with a Modbus Master.

Summary: The master station can issue query commands on the Modbus bus, and it is unique on this bus. There can be multiple slave stations, which constantly monitor the messages on the bus and respond to commands from the master station based on the messages; The slave cannot issue query commands and can only respond.

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