Because there is no guide and it helps to help others, here is the color-coded cables and what they represent: - Red => VCC or current + 3.3V / + 5V - = Black> ground - Green => Tx + or Data (in short it is transmitting data and it plugs into a pin "reception" or Rx) - White => Data- or Rx (receive data and it plugs into a pin "transmission" or Tx)