Daisy chain connection system and system control method

A system control method in a daisy chain connection system in which a first information equipment controls a plurality of second information equipment wire-connected in a daisy chain,

• wherein the second information equipment includes a control unit which performs information processing control in its own information equipment, and a power supply unit which performs power supply control of feeding externally supplied power to its own information equipment,
• wherein the first information equipment and the control unit of the second information equipment include a communication circuit capable of wired communication using the wired connection,
• wherein the first information equipment and the power supply unit of the second information equipment include a wireless circuit capable of mutual wireless communication based on wireless connection,
• wherein, when turning OFF a power supply to any one of the second information equipment,
• the system control method comprises:
• a power supply stop request step of the first information equipment requesting the power supply unit of the second information equipment to stop the power supply by using the wireless communication;
• and
• a power supply stop implementation step of the power supply unit performing control for stopping the power supply to the control unit according to the request in the power supply stop request step.