Nellcor Pulse Oximeter Probe pinout

connector or cable wiring scheme

9 pin D-SUB male connector
at the connector end

connector end Pin	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. For more theory of operation see: http://www.mcc-med.de/homepage/pdf/po300_d.pdf (page 11 of which PDF correlates well with this pinout) and http://www.bioe.psu.edu/SeniorDesignProjects/SD2006/DFord/bioe450%20web%20page.htm

Pinouts.ru > MP3 players and other portable devices pinouts listing > Pinout of Nellcor Pulse Oximeter Probe and layout of 9 pin D-SUB male connector	Document status:	correct
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