Connection checking system, printer device, method of checking connected state, connection checking program, and recording medium storing connection checking program

摘要

A connection checking system of the present invention is arranged so as to apply a power supply voltage which is dropped by the resistance to a terminal when the control substrate and the unit are connected. Then, the control section determines that the unit is connected to the control substrate when the dropped voltage is applied to the terminal. On the other hand, when a dropped voltage is not applied to the terminal, the control section determines that the unit is not connected to the control substrate. The connection checking system of the present invention can be realized by using a conventional power supply cable, a signal cable and a terminal, and thus the connection checking system of the present invention can be manufactured at low costs.