Communication system, master device and slave device, and communication method

A master device configured to carry out communication with slave devices, comprising:

• a request signal reception part configured to receive request signals indicating requests to transmit data from the slave devices;
• a selection part configured to select one of the slave devices to be allowed to transmit data, in response to the request signals received by the request signal reception part;
• a transmission part configured to transmit a signal, indicating to allow the slave device selected by the selection part to transmit data, to the selected slave device;
• and
• a data reception part configured to receive data from the selected slave device.

A slave device of slave devices configured to carry out communication with a master device, comprising:

• a request signal generating part configured to generate a request signal indicating a transmission request to the master device, in a case where data to transmit is generated;
• and
• a transmission part configured to transmit the request signal to the master device, wherein
• the master device selects one of the slave devices to be allowed to transmit data in response to the request signals from the slave devices;
• transmits a signal, indicating to allow the selected slave device to transmit data, to the selected slave device;
• and receives data from the selected slave device.

A communication method in a communication system having a master device and slave devices, the method comprising:

• generating by the slave devices request signals indicating transmission requests to the master device when data to transmit is generated;
• transmitting by the slave devices the request signals to the master device;
• receiving by the master device the request signals from the slave devices;
• selecting by the master device one of the slave devices in response to the received request signals;
• transmitting by the master device a signal, indicating to allow the selected slave device to transmit data, to the selected slave device;
• and
• receiving by the master device data from the selected slave device.