In-Situ RDO PRO-X Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 19)

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Converter
Power Connections
The red wire provides power for all system modes. Analog output is disabled by default.
However, the 4-20 mA current loop output can be continuous in Modbus or SDI-12
mode as long as Modbus device register 9507 is set to 1.
Communications
The device automatically switches between Modbus and SDI-12 modes depending on
which of the two interfaces has activity. Modbus and SDI-12 cannot be used at the
same time—whichever one is currently in use will block communication on the other.