Patent ID: 8433837

Claim:
A system for connecting electronic devices, comprising: a master device; and a plurality of slave devices connected to the master device via a bus, wherein each slave device comprises a control unit connected to the master device via the bus, a switch unit connected to the control unit and connected to the master device via the bus, and a lock unit connected between the control unit and the switch unit; wherein in response to a new slave device being connected to the system, the control unit of the new slave device transmits a request signal to the master device, the master device detects whether the master device is communicating with the already connected slave devices after receiving the request signal; wherein in response to the master device being communicating with the already connected slave devices, the master device outputs a first signal to the control unit of the new slave device, and in response to receiving the first signal, the control unit of the new slave device controls the lock unit of the new slave device to output a second signal to turn off the switch unit of the new slave device; and wherein in response to the master device not communicating with the already connected slave devices, the master device outputs a third signal to the control unit of the new slave device, and in response to receiving the third signal, the control unit of the new slave device controls the lock unit of the new slave device to output a fourth signal to turn on the switch unit of the new slave device, and outputs a locked signal to maintain the locked unit of the new slave device to output the fourth signal, thereby to keep the switch unit of the slave device in a turned on state.