Modbus RTU is a commonly used serial communication protocol used to transmit data in industrial automation systems. It is an implementation of the Modbus protocol, which transmits data through serial communication lines.
To read data from a Modbus RTU device , here are some steps you can refer to:
1. Determine communication parameters: First, you need to determine the parameters required to communicate with Modbus RTU devices, such as serial port baud rate, data bits, check bits, stop bits, etc. These parameters are usually specified in the device’s documentation or instructions.
2. Establish a serial port connection: Use a serial port cable to connect the computer to the Modbus RTU device. Make sure you select the device’s serial port number correctly.
3. Write a Modbus RTU read command: According to the specifications of the Modbus RTU protocol, write a command to read the register. The command includes device address, function code, register address and the number of registers to be read.
4. Send commands and receive responses: Use the serial port to send the written commands to the device and wait for the device’s response. The device will reply with a data frame containing the required data.
5. Analyze the received data: Analyze the received data frame according to the specifications of the Modbus RTU protocol and extract the required data.
6. Process data: Process and convert the received data according to actual needs to prepare for subsequent operations.
It should be noted that different Modbus RTU devices may have different command formats and data parsing methods, and the specific operation steps may be different. Therefore, in actual operation, it is best to refer to the instruction manual or documentation of the device to ensure that the data is read correctly.
To sum up, reading data from a Modbus RTU device requires determining communication parameters, establishing a serial port connection, writing and sending read commands, and receiving and parsing the device’s response data . These steps will help you successfully read the data of Modbus RTU devices. The above content is answered by Zongheng Intelligent Control. I hope it will be helpful to you!