COMMUNICATION SYSTEM, AND MASTER NODE AND SLAVE NODE FORMING SUCH COMMUNICATION SYSTEM

PROBLEM TO BE SOLVED: To make it possible for a slave node to receive a system sleep signal in a partial mode without adding to a transceiver a component to determine the system sleep signal.SOLUTION: A microcomputer of a master node performs master side processing if the master node transmits a system sleep signal in a partial mode. In the master side processing, a partial wakeup command to move a slave node in a sleep state to a wakeup state is transmitted prior to the system sleep signal (S100). That is, the master node firstly transmits the partial wakeup command (S100), waits until the slave node becomes the wakeup state (S110), and then transmits the system sleep signal (S120).