Patent ID: 6879563

Claim:
A data repeater for repeating plural types of data and being interfaced with a plurality of multiplex communication lines through a receiving buffer and a sending buffer for transmitting data whose priority is previously set based on data type, comprising: a data controller for selecting a certain multiplex communication line of the multiplex communication lines through which received data that is received from one of the multiplex communication lines other than the certain multiplex communication line is to be repeated and for transmitting the received data to the certain multiplex communication line, the data controller for preventing direct transmission of data between respective ones of the plurality of multiplex communication lines over which data is being transmitted and received by causing the received data to be temporally held from when the data is received by the receiving buffer through when the received data is transmitted from the receiving buffer to the sending buffer to when the data is transmitted by the sending buffer; and priority-reset means within the data controller for resetting a priority of the received data to a priority higher than an original priority of the received data when it is received, when the received data is transmitted from the receiving buffer to the sending buffer, wherein the priority-reset means resets the priority of the received data to a predetermined constant priority higher than original priorities of other data within the certain multiplex communication line.