If the reliability exceeds Modbus, then your communication specification is the most popular! The difference and connection between RS 485 and MODBUS Use PLC or VB language to process according to this specification defined by yourself. If you want, you can also define a communication specification yourself. There are only two communication formats and communication specifications. This is actually the communication protocol, and any protocol is similar. The above is the official definition, let’s use ordinary words to explain: Both communication parties must support one of the above modes at the same time. Devices that support Modbus protocol generally support the RTU format. They define different ways of how data is packaged and decoded. Modbus has two serial transmission modes, ASCII and RTU. Modbus communication standard protocol can be transmitted through various transmission methods, such as RS232C, RS485, optical fiber, radio, etc. The actual address range of the slave station is 1-247. The address range of the slave station is 0-247, where 0 is the broadcast address. There can only be one master station on the Modbus network, and the master station has no address on the Modbus network. Modbus is a master/slave communication mode with a single master station. In the data acquisition and monitoring control system (SCADA), Modbus is usually used to connect the monitoring computer and the remote terminal control system (RTU). For example, a device that measures temperature and humidity and sends the results to a computer. Modbus allows multiple (approximately 240) devices to be connected on the same network to communicate.

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The main reasons why Modbus is more widely used than other communication protocols are:

RS485 communication transmission of electromagnetic flowmeter Modbus protocol.

RS485 communication (Modbus protocol) data acquisition characteristics.

4-20mA current loop data acquisition characteristics.

Features of 4-20mA current loop and RS485 communication (Modbus RTU protocol) data acquisition.

The difference and connection between RS 485 and MODBUS.

Modbus rtu serial communication protoco