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What is the 0V terminal used for on the Energy Server COM'X 200?

When wiring Modbus communications to the Energy Server COM'X 200 there may be confusion with regards to the 0V terminal.

Product Line: 
Energy Server COM'X 200
Modbus communications wiring for the Energy Server COM'X 200.
A user is wiring Modbus communications on an Energy Server COM'X 200 and is unsure of what to wire to the 0V terminal. 
The 0V terminal on the Energy Server COM'X 200 Modbus communications terminal is the signal and power supply common.

Please wire from the 0V of the DC control power. 

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