Nellcor Pulse Oximeter Probe

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connector or cable wiring scheme Disposable

9 pin D-SUB male connector layout 9 pin D-SUB male connector at the connector end

connector end Pin Name Description
9 phototransistor cathode green wire
5 phototransistor anode white wire; phototransistor detects level of IR and/or red light transmitted through the finger
7 shield cable shield, connects to copper shield over the phototransistor
2 LED1 red wire; anode of the IR LED, cathode of the red LED
3 LED2 black wire; cathode of the IR LED, anode of the red LED


Across pins 2 and 3, I see different voltage drops depending on polarity; so I think the single 2-pin package connected to those pins is actually both IR and red LEDs together, and the instrument would probably apply first one polarity, then the other, to alternately measure conductance of IR and red light through the patient’s finger.


Category:Portable Device Connectors


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