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9 pin D-SUB male connector layout
9 pin D-SUB male connector
Disposable
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 patients finger.

 

 

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Эта распиновка
Источник(и) этой и дополнительной информации: 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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