Patent ID: 8977782
Filing Date: 2015-03-10
Classification: G06F,G06K

Abstract:
1. An electronic device which is connectable to an external device, comprising: a main substrate; an interface substrate which is detachably connected to the main substrate; a first interface which is installed on the interface substrate, the first interface which is connectable to the external device; a second interface which is installed on the main substrate, the second interface which is connectable to the external device, a selection unit configured to select one interface of the first interface and the second interface; a communication unit configured to communicate information with the external device through the interface selected by the selection unit; and a control unit, wherein the second interface is configured to detect a connection state to the external device and the first interface is not configured to detect the connection state to the external device, wherein when the electronic device is powered on, the control unit determines whether the second interface detects a connection to the external device, and then the selection unit selects the second interface if the controller determines that the second interface detects the connection to the external device while the controller goes into a connection waiting state if the controller determines that the second interface does not detect the connection to the external device, wherein when the controller is in the connection waiting state, the selection unit selects the second interface in a case where the second interface detects the connection to the external device and the first interface does not receive data from the external device, wherein when the controller is in the connection waiting state, the selection unit selects the first interface in a case where the first interface receives data from the external device and the second interface does not detect the connection to the external device, wherein, once the selection unit selects one interface of the first interface and the second interface, the selection is not changed until the electronic device is powered off.