Communications system of two-wire line enhancing fail-safe...

Details Communications system of two-wire line enhancing fail-safe... Communications system of two-wire line enhancing fail-safe...

2008-03-25

2008-03-25

Odom, Curtis (Department: 2611)

Pulse or digital communications

Cable systems and components

C398S001000, C398S004000, C398S010000, C398S017000, C702S058000, C702S059000, C714S001000, C714S002000, C714S003000, C714S004110, C714S025000, C714S043000, C714S100000

Reexamination Certificate

active

07349479

ABSTRACT:
Five electronic control units (ECU) control vehicle devices using CAN protocol. Each of ECUs is provided with a resistor and a switch for activating the resistor. A first and fifth ECUs are arranged on the leftmost and rightmost ends. Resistors of the first and fifth ECUs are used as terminating resistors to a two-wire communications line. When the two-wire communications line is broken, the first ECU sends a test signal while other ECUs excluding the fifth ECU turn on the switches from right to left. When the test signal can be received, a broken point is located on the right side of ECU that turns on its switch at this time. Thereafter ECUs on the left side of the broken point conduct communication.

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