C4001 25Mts I2C Address and protocol setup

Hi there, 

I am trying to use C4001using a custom framework (not Arduino), so I am porting the sources of them. I want to use I2C comms, and in the wiki it is stated “Please switch the DIP switch on the back of the sensor to the UART direction, and copy the following code to your Arduino IDE and upload it.”
But, in the board there are no switches (https://www.dfrobot.com/product-2793.html)
May, please, someone clarify how to setup the I2C protocol and address on the 25mts board?

Thanks