MULTIPLE COMMUNICATION EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide multiple communication equipment for preventing the entire equipment from being disabled in communication even when a bus line is short-circuitted to a GND or power source. SOLUTION: In the equipment for performing data communication among respective plural ECU 1-A1 to 1-B4 mutually while connecting these ECU in the shape of loop through bus lines 3A and 3B, a 1st controller 5 connected to one terminal (b) of the bus line 3A has a 1st relay RLY-A connected to one terminal of the bus line 3A and one terminal (a) of the bus line 3B and a 2nd controller 7 connected to another terminal (c) of the bus line 3B has a 2nd relay RLY-B connected to another terminal (d) of the bus line 3A and the other terminal of the bus line 3B. Then, when bus abnormality detecting parts 11 a and 11b detect the short-circuitting abnormality of the bus lines 3A and 3B, relay control parts 13a and 13b turn off the relays in the present controllers.