Protocol adapter for passing diagnostic messages between vehicle networks and a host computer
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Abstract
A protocol adapter for transferring diagnostic messages between networks within a vehicle and a host computer. The protocol adapter operates as a voltage translator to support J1708 software. The protocol adapter also recognizes when the protocol adapter is connected to a host computer running the J1939 and/or J1708 protocols and automatically switches to that protocol.
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Citations
17 Claims
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1-8. -8. (canceled)
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9. A protocol adapter for transferring diagnostic messages between a vehicle network in a vehicle and an external host computer, said adapter comprising:
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a control area network (CAN) transceiver circuit, said CAN transceiver circuit providing an interface between the vehicle network and the host computer when the vehicle network is operating in a first protocol; and
a J1708 transceiver circuit, said J1708 transceiver circuit providing an interface between the vehicle network and the host computer when the vehicle network is operating in a J1708 protocol and the protocol adapter is operating in a pass-through mode, said J1708 transceiver circuit including a voltage translator for translating the voltage of the J1708 protocol signals. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A protocol adapter for transferring diagnostic messages between a vehicle network in a vehicle and an external host computer, said adapter comprising:
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an I/O board, said I/O board including an external I/O interface circuit, an RS-232 transceiver circuit for providing an interface to an RS-232 port on the host computer, a power supply regulator circuit, a controller area network (CAN) transceiver circuit for providing an interface between the vehicle network and the host computer when the vehicle network is operating in a J1939 protocol, a J1708 transceiver circuit for providing an interface between the vehicle network and the host computer when the vehicle network is operating in a J1708 protocol, said J1708 transceiver circuit including a voltage translator for translating the voltage of the J1708 protocol signals, and an LED circuit; and
a CPU board, said CPU board including a CPU, a device decoder circuit that decodes input signals sent to the CPU, a static RAM circuit for providing temporary data storage and is connected to the CPU through data and address channels, a flash memory module for providing a flash memory storage for permanent storage of application data and loader application information, a universal asynchronous receive transmit (UART) circuit for providing communication of asynchronous data to and from the host computer and a CPU I/O interface circuit for providing an interface between the CPU and other adapter circuits. - View Dependent Claims (17)
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Specification