A data transmission interface system includes a first electronic component having a first pin, a second electronic component having a second pin electronically connected with the first pin via a wire. The first electronic component includes an encoding module for converting a command into a pulse code. The second electronic component includes a decoding module for converting the pulse code into the command. The first pin is capable of switching between a first state and a second state. The second pin is in the same state as the first pin. Switch of the first pin from the first state to the second state triggers a beginning of data transmission between the first electronic component and the second electronic component. A related method is also provided.