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Forum: µC & Digital Electronics T6615 or similar CO2 sensor


Author: Richard Müller (Guest)
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Hi,
does someone has experience with the T6615 or some other member of the 
T6000-family?

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

-richard

Author: seltener Gast (Guest)
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Hi Richard,

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

You can find an example here:

http://www.dieelektronikerseite.de/uC%20Ecke/Lections/RS232%20-%20Der%20PC%20und%20der%20AVR%20verstehen%20sich.htm

Regards,

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