Diagnostic interface circuit

Details Diagnostic interface circuit Diagnostic interface circuit

H - Electricity

04

L

H04L 5/14 (2006.01) B60R 16/02 (2006.01) G06F 13/36 (2006.01) G06F 13/40 (2006.01) G01R 31/00 (2006.01)

Patent

CA 2138704

An interface circuit for providing signals necessary to monitor one or more on-board vehicle computers through a serial communication link between an off-board controller and the on-board vehicle computer. The interface circuit is provided on the vehicle in order to provide the command signals to the off-board controller which will enable a standard monitoring device to read key information from the on-board vehicle computer. Additionally, the interface circuit also provides support of a second mode of operation that conforms to a proprietary communications protocol. The interface circuit automatically recognizes and adapts to the proper communication protocol for the tool sensed. The interface circuit complies with both a proprietary communication protocol and with an ISO 1941 format which satisfies an OBDII/CARB specification which all automobiles sold in the United States must comply with by the 1996 model year.

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