This module as a very generic item... It simply allows you to wire up non-grove items, to be used in the grove system. As the grove system uses I2C you can wire up additional I2C items.
Comparing the pin configuration to that of other modules, it looks like D1 would be used for your SCL line, and D2 for the SDA line.
Grove - Screw Terminal with four 3.5mm pitch pins rated up to 6A. Terminal can accept 30 to 20AWG wire. It is most commonly used pitch screw terminal. This Grove has four ports including GND, VCC and two other ports. This Grove can be used to interface Grove wires(signals) with other external non-Grove modules. This Grove acts as a wiring form factor converter.
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