Output and input interface in between multi-voltage circuits

The output and input interface can include: the first circuit and its first output/input terminal; the second circuit and its second output/input terminal; switching apparatus, which is used to switch the connection between the first output/input terminal and the second output/input terminal; grounding apparatus, which is used to control the grounding of the first output/input terminal; and trigger apparatus, which is used to induce a signal of terminating output for the first circuit and is used to trigger the switching circuit in order to isolate the first output/input terminal and the second output/input terminal so as to trigger the grounding apparatus and make the first output/input terminal ground. The output/input terminal interface method can include the following steps. At first, the signal of terminating output for the first circuit is induced. Then, the first output/input terminal and the second output/input terminal are isolated. The first output/input terminal is grounded. After that, the first output/input terminal is floated. Finally, the first output/input terminal and the second output/input terminal are connected so as to make the first output/input terminal receive signal of the second output/input terminal.