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How To: Connect to a Modbus device


  1. Setup communication parameters to be used to connect to your device.
  2. Choose Communication->Connect menu item or click the Connect toolbar button to connect to your device.
  3. Verify that the connection was successful.
  4. If the connection was successful, the status is reflected in the status bar as below.

    Successful connection Connection failure
  5. If the connection was unsuccessful, a pop-up error message is also displayed as below.

  • The Connect operation attempts to make a TCP connection to the Modbus device. Under different circumstances, a connection attempt may fail after several seconds of initiating it. The Connect toobar button and the menu item are both disabled until the connect operation is completed, successfully or not.

Next Steps

Topic link Setup a Data Group Form to acquire data from your device
Topic link Change values of Modbus variables from Data Group Form
Topic link Disconnect from your Modbus device

See Also

Topic link How To: Configure Modbus Protocol Tester for Modbus RTU communication
Topic link How To: Configure Modbus Protocol Tester for Modbus TCP communication
Topic link Setup Communication Parameters
Topic link Troubleshooting connection problems
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