Forum: µC & Digital Electronics T6615 or similar CO2 sensor

von Richard Müller (Guest)

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does someone has experience with the T6615 or some other member of the 

I'm not sure how to connect the serial port of this device. It has a pin 
named "Rx" and one "Tx". How to connect with the PC's serial port?

Which one of the two following examples is right?
sensor ---- D-Sub9-Pin - PC
1)  Rx ----      3     - Tx
    Tx ----      2     - Rx
   GND ----      5     - GND

2)  Rx ----      2     - Rx
    Tx ----      3     - Tx
   GND ----      5     - GND 

Unfortunately the datasheet says nothing about it.

Thanks for helping


von seltener Gast (Guest)

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Hi Richard,

you will need a level shifter (e.g. MAX232) to connect the sensor to a 

You can find an example here:




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