In-Situ RDO PRO-X Process Optical Dissolved Oxygen Sensor Manual - Manual (Page 16)

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SDI-12 (3-wire)
Signal Color
Ground/Return Black
External Power (9.6-16
VDC)
Red
RS485 (-) Green
RS485 (+) Blue
SDI-12 White
Cable length must not exceed 60.96 m (200 ft.)