Communication on the LL50 setting tool isn't working.

Check the following.

1. Whether the dedicated cable is securely inserted into the adapter.
2. The position of attachment to the front of the controller.
3. In Device Manager, under Ports (COM and LPT), confirm that "Yokogawa USB Serial Port" appears, and that under Universal Serial Bus Controllers, "Yokogawa USB Serial Converter A1053UR" appears.
4. The COM port numbers.