SYSTEM, DEVICE AND METHOD FOR DETECTING CONNECTION OF CONNECTING STRUCTURE

The present invention relates to a system, device and method, for detecting a connection of a connecting structure, which can automatically detect a first device connecting to a second device as well as identify the first device. Disclosed is a system for detecting a connection between two devices includes a first device and a second device. The first device includes a first connection terminal having a 1-1 contact point and a 1-2 contact point; and a first reactance element connected to the first connection terminal. The second device includes a second connection terminal having a 2-1 contact point and a 2-2 contact point which correspond to the 1-1 contact point and the 1-2 contact point; a first resistance element, and a first frequency generator for allowing a signal, which changes in frequency within a predetermined range, to pass through the first resistance element and be applied to the first device via the second connection terminal. The second device further includes a first comparator having both input terminals connected to both ends of the first resistance element, and comparing and outputting a signal of both ends of the first resistance element, and a first control unit for determining whether or not the first connection terminal of the first device is connected to the second connection terminal by means of the output signal of the first comparator.