Patent ID: 6850826

Claim:
A vehicle network system, comprising: a transmission path; a plurality of slave apparatuses connected to the transmission path; one master apparatus connected to the transmission path, the master apparatus controlling states of the respective slave apparatuses through the transmission path, the master apparatus including a command notifying device that periodically notifies the respective slave apparatuses of a system state command containing a system state in which states of all of the slave apparatuses are collectively managed, wherein each of the slave apparatuses includes: a memory which stores a current apparatus state of the respective slave apparatuses; a determining device for determining whether the current apparatus state stored in said memory of the slave apparatus coincides with the system state in the system state command that is received from the master apparatus; and an apparatus state changing device for making the current apparatus state stored in said memory of the slave apparatus coincident with the system state when the determining device determines that the current apparatus state of the slave apparatus does not coincide with the system state.