Dear Robin2,
Yes, I only use and test on Serial Port.
Here is the picture of my breakout. It's connected to HarwareSerial
http://www.hello-web.net/temp/breakout.jpg
The OpenLog GND is connected to the ground.
No I have not tried to create two separate code because I use a #define PORTONE to use either the Serial or the Hardware. But I can do it immediately and I post the code in 5mn