Daisy chain connection system and system control method
A system having information equipment connected in a daisy chain, where power supply control of the daisy chain-connected information equipment is performed without having to add a dedicated power supply control device. In a daisy chain connection system, second information equipment comprise a control unit and a power supply unit, and a first information equipment and the control unit of the second information equipment include a communication circuit capable of wired communication, and the first information equipment and the power supply unit of the second information equipment include a wireless circuit capable of wireless communication. When turning OFF a power supply to any one of the second information equipment, the first information equipment requests the power supply unit to stop the power supply by using wireless communication, and the power supply unit performs control for stopping the power supply to the control unit according to the request.
1. A daisy chain connection system in which a first information equipment is in connection with and controls a plurality of second information equipment wire-connected in a daisy chain,
wherein the second information equipment comprises:
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 and to the control unit,
wherein the first information equipment and the control unit of the second information equipment include a communication circuit capable of wired communication using a 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 first information equipment requests the power supply unit of the second information equipment to stop the power supply by using the wireless communication, and the power supply unit performs control for stopping the power supply to the control unit according to the request,
wherein, when turning OFF a power supply to any one of the second information equipment, after the power supply unit performs control for stopping the power supply to the control unit, and
wherein the first information equipment confirms a connection status with the control unit, and when the confirmation of the connection status is not received, determines the turning OFF of the power supply to the second information equipment was successful.
2. The daisy chain connection system according to claim 1 ,
wherein the control unit of the second information equipment further includes the wireless circuit capable of wireless communication with the first information equipment based on wireless connection.
3. The daisy chain connection system according to claim 1 ,
wherein, when turning ON a power supply to any one of the second information equipment, the first information equipment requests the power supply unit of the second information equipment to start the power supply by using the wireless communication, and the power supply unit performs control for starting the power supply to the control unit according to the request.
4. The daisy chain connection system according to claim 3 ,
wherein, when turning ON a power supply to any one of the second information equipment, after the power supply unit performs control for starting the power supply to the control unit,
the first information equipment confirms a connection status with the control unit, and determines whether the turning ON of the power supply to the second information equipment was successful based on a result of the confirmation.
5. A system control method in a daisy chain connection system in which a first information equipment is in connection with and 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 a 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,
wherein, when turning OFF a power supply to any one of the second information equipment, after the power supply unit performs control for stopping the power supply to the control unit, and
the system control method further comprises:
a power supply OFF determination step of the first information equipment confirming a connection status with the control unit, and when the confirmation of the connection status is not received, determining the turning OFF of the power supply to the second information equipment was successful.
6. The system control method according to claim 5 ,
wherein the control unit of the second information equipment further includes the wireless circuit capable of wireless communication with the first information equipment based on wireless connection.
7. The system control method according to claim 5 ,
wherein, when turning ON a power supply to any one of the second information equipment,
the system control method comprises:
a power supply start request step of the first information equipment requesting the power supply unit of the second information equipment to start the power supply by using the wireless communication; and
a power supply start implementation step of the power supply unit performing control for starting the power supply to the control unit according to the request in the power supply start request step.
8. The system control method according to claim 7 ,
wherein, when turning ON a power supply to any one of the second information equipment, after the power supply unit performs control for starting the power supply to the control unit,
the system control method further comprises:
a power supply ON determination step of the first information equipment confirming a connection status with the control unit, and determining whether the turning ON of the power supply to the second information equipment was successful based on a result of the confirmation.