PDA, Tablet PC, MP3 players and other portable devices  > Nellcor pinouts
connector end Pin Pin
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 patients finger.



9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the connector end
According to 8 reports in our database (8 positive and 0 negative) this pinout should be correct.

Is this pinout
Nellcor Pulse Oximeter Probe visual pinout:
Nellcor Pulse Oximeter Probe diagram
click to enlarge
Source(s) of this and additional information: 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
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