What is Modbus protocol?

What is Modbus protocol?

What isModbus?Modbus is the first soft communication protocol proposed by modicon. Is gradually recognized as a standard communication protocol. Data communication or transmission, different systems can communicate. Currently, during RS232/RS485 communication, This Protocol is widely used. There are two common Modbus communication protocols: Modbus ASCII and Modbus RTU. Generally, the Modbus ASCII protocol is used for communication with a small amount of communication data and mainly for text communication. Modbus RTU Protocol is usually used for communication with large amounts of data and binary values. In actual application, in order to solve a special problem, people like to modify the Modbus Protocol to meet their own needs (in fact, people often use their own definition of the protocol for communication, this can solve the problem, but it is not standardized ). A more common practice is to modify the Protocol in a small amount, but to attach the Protocol format together with the software specification, or directly put it in help, so as to facilitate user communication.