Inverter MODBUS RTU Driver  
GP-Pro EX Device/PLC Connection Manual
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3.6 Setting Example 6
 GP Pro-EX Settings
 Communication Settings
To display the setup screen, from the [System Settings] workspace, select [Device/PLC].
 Device Setting
To display the [Individual Device Settings] dialog box, from [Device-Specific Settings] in the [Device/PLC] 
window, select the External Device and click   [Settings]. To connect multiple External Devices, from 
[Device-Specific Settings] in the [Device/PLC] window, click   to add another External Device.