How can data acquisition with Modbus be implemented in Java?

2 years ago
Benjamin Taylor
2 minutes

To achieve Modbus data collection, the following steps can be used:

  1. Importing Modbus communication library: Importing Modbus communication library in a Java project allows the use of existing third-party libraries like jmri or j2mod. These libraries provide the API and features for Modbus communication.
  2. Create a Modbus master: Use the Modbus communication library to create a Modbus master object for communicating with Modbus slaves. The master is responsible for sending requests and receiving responses from the slaves.
  3. Connect to the Modbus slave: Use the master station object to connect to the Modbus slave. The slave can be a PLC, sensor, or other Modbus device. By specifying the IP address and port number of the slave, the master station can establish a communication link with the slave.
  4. Configure Modbus registers: Use the master station object to set the address and quantity of the Modbus registers you want to read or write. You can specify the read or write operation using function codes.
  5. To access Modbus registers, use the master station object to send a read request and receive a response from the slave station. You can specify the address and quantity of registers to read the values of the registers.
  6. Write to Modbus registers: Send a write request using the master station object and receive a response from the slave station. Specify the register address and value to be written to the register.
  7. Processing Modbus response: Handle the response according to the response from the slave. You can check the status code and error code of the response to determine if the communication was successful.
  8. Close the Modbus connection: Once data collection is done, use the master station object to close the connection with the slave station.

The above are general steps to achieve Modbus data collection, the specific implementation and code may vary depending on the Modbus communication library used. One can refer to the official documentation or sample code of the specific communication library to learn more details and usage methods.

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