Patent ID: 7680228

Claim:
A communication system comprising a master node and a plurality of slave nodes, and the system in which the master node and slave nodes, and the system in which the master node and salve nodes communicate with one another, wherein the master node comprises: a clock transmission means for transmitting a clock signal to the plurality of slave nodes; a means for transmitting a group of communication selection signals, which signifies whether each slave node is selected as a party of signal transmission to or from the master node and which signifies a direction of communication, to the slave nodes; a means for transmitting data to the plurality of slave nodes synchronously with the clock signal; and a means for receiving data sent from a selected slave node synchronously with the clock signal; wherein the group of communication selection signals includes a first selection signal signifying whether each slave node is selected as a receiver of signal transmission from the master node, and a second selection signal signifying whether each slave node is selected as a sender of signal transmission to the master node; and the second selection signal is used to select at most one slave node simultaneously.