Step 1. Open a Communications Port

To test communication with a Mitsubishi programmable controller you first select its communication port, baud rate and parity.

  1. Select the following.


Select the:

Comm Port

Communication port for the PLC.

Baud rate

Baud rate for the programmable controller.


Parity for the programmable controller.

  1. Click Open Port to initialize communications.

The status of your request is displayed in the message field.

If an error message is displayed, check that the selected communication port is not in use by another program and that the port is properly configured and available on the PC and operating system.

More information

    Mitsubishi A-Series Serial Communications diagnostics.