Patent attributes
An electronic device includes first and second connecting wires to which first and second signal wires are connectable, respectively, and a first resistor. The first signal wire transmits a first signal between the electronic device and an external device. The second signal wire transmits a second signal from the external device to the electronic device. The first resistor is disposed between the first connecting wire and a power source of the electronic device. A resistance value of the first resistor is set such that an output voltage from the second connecting wire is lower than a reference value when a voltage of the power source is input to the second connecting wire via the first connecting wire and the external device in a state in which the first and second signal wires are electrically connected to one another and the second signal is not input to the second signal wire.
