radio settings

Hello, I'm busy developing a Helix flybarr TRex 500 with a motherboard APM 2.5
I loaded the Mission Planner 1250 software on my PC and the firmware V291b heli.
I have a Futaba radio and I T12FG driver mode 1 (throttle right). By following the tips I fo

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I2C connector on APM 2.5

Hi to all
I'm busy up a Helix Trex 500 with APM 2.5. I have put the magnmoter on the tail  .. I want to connect the magnometer to the I2C connector on the APM board. Can anyone give me the position of the GND, VCC, SDA, SCL on the I2C connector ?

thank

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