Mitsubishi Electric GOT2000 Series Hardware User Manual page 287

In the [Select CH No.] dialog, select [MODBUS Master] to display the device setting dialog.
Input 3-00001 to Device.
Select [Host] for Network.
Click the [OK] button when settings are completed.
3-00001 is a fixed register to access to the rotary switch of the connector conversion box by the MODBUS communication.
7
In the [Action] tab, check that [@2 300001] is displayed in [Indirect].
Tick the check box of [Fixed] and enter 256.
Since [Net No.] is fixed to 1, 256 is entered.
For [Fixed], enter the value calculated by the expression 256 × [Net No.].
Click the [OK] button when entering is completed.
After checking that both Trigger and Action are set, click the [OK] button.
7 OPTION AND COMMUNICATION CABLE FOR HANDY GOT
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7.1 Connector Conversion Box